This guide translates transfusion medicine into actionable, bedside-ready knowledge for resource-limited hospitals — where whole blood remains the backbone, PRBC and FFP supplies fluctuate, and clinical judgment replaces laboratory immediacy. Structured for the OR, ICU, and obstetric theater.
01
Foundations & Fast Orientation
🧠 1.1 — What Transfusion Really Treats
Before reaching for blood, always ask: What am I treating — oxygen debt, coagulation failure, or volume loss?
Transfusion is not a treatment for anemia itself — it's a rescue for oxygen delivery failure.
Pillar 1
O₂-Carrying Capacity
→ Hemoglobin
→ Hemoglobin
Pillar 2
Coagulation Support
→ FFP / Cryo / Plt
→ FFP / Cryo / Plt
Pillar 3
Volume Restoration
→ Circulatory stability
→ Circulatory stability
Key Concept: A patient with Hb 6 g/dL but stable, warm, and normotensive may tolerate it. A patient with Hb 8 g/dL but cold, hypotensive, and tachycardic may die without transfusion. It's not the number — it's the delivery.
⚙️ 1.2 — Whole Blood vs Components
| Component | Volume | Contents | Shelf Life | Function |
|---|---|---|---|---|
| Whole Blood | 450 ± 50 mL | RBC + plasma + platelets (early) | 21–35 days | Best for major hemorrhage |
| PRBC | 250–300 mL | RBCs + small plasma | 35–42 days | Raises Hb; minimal factors |
| FFP | 200–250 mL | All coag factors (no plt) | 1 year (frozen) | Reverses coagulopathy |
| Cryoprecipitate | 15–20 mL/unit | Fibrinogen, VIII, XIII, vWF | 1 year (frozen) | Target fibrinogen <1 g/L |
| Platelets | 50–70 mL | Platelets + plasma | 5 days | Stops microvascular bleeding |
Storage decay: Platelets gone after 6–8 hours. Factor V and VIII degrade after 5–7 days. K⁺ and lactate rise with age. "Fresh whole blood" (<24 h old) behaves like a balanced transfusion.
🩸 1.3 — Quick Physics of O₂ Delivery
Oxygen Delivery Formula
DO₂ = CO × CaO₂
CaO₂ = (1.34 × Hb × SaO₂) + (0.003 × PaO₂)
If Hb = 5 g/dL → CaO₂ ≈ 6.7 mL/dL — no fluid or pressor can substitute this.
CaO₂ = (1.34 × Hb × SaO₂) + (0.003 × PaO₂)
If Hb = 5 g/dL → CaO₂ ≈ 6.7 mL/dL — no fluid or pressor can substitute this.
🌍 1.4 — Limited-Resource Mindset
- Stabilize First — airway, hemorrhage control, temperature
- Transfuse Judiciously — whole blood if active bleeding + pallor + shock
- Use FFP Early — replaces lost factors
- TXA early in trauma or PPH; Vitamin K for liver-related INR rise
- Never Delay for Perfection — "Good blood in time saves life better than perfect blood late."
🧾 1.5 — Ten Rules That Prevent Fatal Errors
| Rule | Clinical Meaning |
|---|---|
| 1️⃣ | Identify the patient yourself before transfusion — never trust handwriting |
| 2️⃣ | Check blood group, expiry, integrity in front of a witness |
| 3️⃣ | Never transfuse untyped blood unless immediately life-threatening |
| 4️⃣ | Warm blood if rapid transfusion or neonate |
| 5️⃣ | Record start time, volume, vitals every 15 min |
| 6️⃣ | Stop immediately for rash, fever, dyspnea, or hypotension |
| 7️⃣ | Keep IV line with NS only — never mix drugs |
| 8️⃣ | Calcium gluconate 10% every 3–4 units of blood |
| 9️⃣ | Maintain core temp >36°C — hypothermia kills coagulation |
| 🔟 | If doubt: Stop, label, report, preserve the bag |
🩺 Mnemonic
"Check–Warm–Watch–Stop–Report" — five actions that define a safe transfusion culture.
02
Compatibility & Testing — Minimal Delay, Maximum Safety
🧬 ABO & Rh Basics
| Recipient | RBCs Can Receive From | Plasma Can Be Given To |
|---|---|---|
| O | O only | All groups (universal plasma donor) |
| A | A, O | A, AB |
| B | B, O | B, AB |
| AB | A, B, AB, O (universal recipient) | AB only |
🔹 O-negative RBCs = universal RBC donor · 🔹 AB plasma = universal plasma donor
In obstetric or childbearing-age women: O-negative only — Rh sensitization is permanent.
In obstetric or childbearing-age women: O-negative only — Rh sensitization is permanent.
🧪 Type & Screen vs Crossmatch
| Test | Purpose | Time | Result Meaning |
|---|---|---|---|
| Type & Screen | Determines ABO/Rh + unexpected antibodies | ~15–30 min | Patient profile known; no blood selected yet |
| Crossmatch | Tests patient plasma against donor RBCs | ~45–60 min | Confirms safe donor–recipient pairing |
🚨 Emergency Release — When Every Second Counts
- Adult male or postmenopausal female: O-positive blood
- Female of childbearing age / children: O-negative blood
- Massive bleed: freshest whole blood available if delay exceeds 20–30 min
🕒 Golden Rule
"If you can type and crossmatch in <10 min, wait. If the patient will die in <10 min, transfuse."
🔄 Switching from O to Type-Specific Safely
- Stop O supply as soon as type-specific units are available
- Never mix O with another type simultaneously — always flush with NS between types
- Monitor first 15 minutes carefully — delayed hemolysis may appear subtle
- Confirm group twice from separate samples before switching
📋 Summary — Emergency Compatibility Quick Reference
| Situation | Preferred Blood | Alternative | Notes |
|---|---|---|---|
| Exsanguinating adult male | O⁺ whole blood | Any fresh whole blood | Record Rh status |
| Exsanguinating female (fertile) | O⁻ whole blood | O⁺ + Anti-D later | Never skip documentation |
| Known group, crossmatch pending | Type-specific blood | O same Rh | Flush line with NS |
| Neonate (exchange) | O⁻, CMV-safe | O⁻ screened | Warm to 37°C |
| FFP shortage | FFP same ABO | AB plasma | Minimum volume |
03
Components & Dosing You Actually Have
| Component | Adult Dose | Pediatric Dose | Neonate Dose | Expected Effect |
|---|---|---|---|---|
| Whole Blood | 1 U ≈ 450 mL | 10–15 mL/kg | 10–15 mL/kg | ↑ Hb ≈ 1 g/dL per 10 mL/kg |
| PRBC | 1 U → Hb ↑ ~1 g/dL | 10–15 mL/kg | 10–15 mL/kg | ↑ Hb ≈ 1 g/dL |
| FFP | 10–20 mL/kg | 10–15 mL/kg | 10–15 mL/kg | INR ≤ 1.5 |
| Cryoprecipitate | 10 U (≈2–4 g fibrinogen) | 1 U / 10 kg | 5 mL/kg | ↑ fibrinogen ≈ 0.5–1 g/L |
| Platelets | 1 pool (4–6 U) | 1 U / 10 kg | 10 mL/kg | ↑ plt ≈ 30–50 ×10⁹/L |
| Ca-gluconate 10% | 10 mL IV q3–4 U | 0.3 mL/kg | 0.3 mL/kg | iCa²⁺ > 1.0 mmol/L |
❄️ No Platelets — Working Solutions
| Problem | What You Can Do | Why It Helps | Caveats |
|---|---|---|---|
| Microvascular ooze, no platelets | Fresh whole blood (<24 h old) | Supplies early platelets + factors | Check age; warm infusion |
| Hypofibrinogenemia | Cryo 10 U → target ≥1.5–2.0 g/L | Restores fibrin scaffold | Watch volume |
| Ongoing fibrinolysis | TXA early (or aminocaproic) | Stabilizes clot | Avoid in sepsis DIC |
| Uremic/antiplatelet dysfunction | DDAVP 0.3 µg/kg IV | Boosts vWF → platelet adhesion | Short-lived 6–8 h |
| Dilutional coagulopathy | FFP 15–20 mL/kg | Replaces broad factors | Watch volume + add cryo |
| Lethal triad | Warm + pH + Ca²⁺ | Restores enzyme function | Monitor iCa²⁺ and temp |
🧰 Adjuncts That Actually Help
- Vitamin K: 10 mg IV slow (≥30 min) — for warfarin/liver/cholestasis
- Calcium gluconate 10%: 10 mL IV q3–4 units; or CaCl₂ 1 g central for severe hypocalcemia
- DDAVP: 0.3 µg/kg IV over 20–30 min — uremia or antiplatelet effect
- rFVIIa (rescue only): 90 µg/kg IV — only after surgical control + targets met
- Aminocaproic acid: antifibrinolytic fallback when TXA unavailable
04
Indications & Thresholds — Adult · Pediatric · Neonatal
| Clinical Context | Hb Trigger (g/dL) | Rationale |
|---|---|---|
| Stable, non-bleeding ICU | <7 | Restrictive strategy safe |
| Active hemorrhage / shock | <8 or symptomatic | Hb less relevant; use physiology |
| Sepsis or major surgery | <8 | Reduced tissue hypoxia tolerance |
| Acute coronary syndrome | <9 | Avoid myocardial O₂ debt |
| Head injury / neurocritical care | 8–9 | Maintain cerebral perfusion |
| Pregnancy / postpartum hemorrhage | <7 (≥8 if unstable) | Consider fetal O₂ + uterine tone |
💡 Principle: In bleeding, transfuse for physiology, not for numbers. Monitor mental status, skin perfusion, lactate, and urine output.
🔹 Coagulation Targets During Bleeding
| Parameter | Target | What to Give if Below |
|---|---|---|
| INR | ≤1.5–1.7 | FFP 15–20 mL/kg |
| Fibrinogen | ≥1.5–2.0 g/L | Cryo 10 U adult / 1 U/10 kg |
| Platelets | ≥50×10⁹/L (≥100 for neuro) | Platelets or WB+FFP if absent |
| Temperature | ≥36°C | Warm fluids, blankets |
| Ionized Ca²⁺ | >1.0 mmol/L | Ca-gluconate 10 mL 10% q3–4 U |
👶 Pediatric & Neonatal Dose Wheel
| Weight (kg) | PRBC (mL) | FFP (mL) | Cryo (mL) |
|---|---|---|---|
| 5 | 50 | 50 | 20 |
| 10 | 100 | 100 | 40 |
| 20 | 200 | 200 | 80 |
| 30 | 300 | 300 | 120 |
| 40 | 400 | 400 | 160 |
🍼 Neonatal blood volume ≈ 80–100 mL/kg. Always use infusion pump and blood warmer. Reassess after every 10 mL/kg — children respond fast and can be easily overloaded.
05
Massive Hemorrhage Protocol (MHP) — Low-Supply Hospitals
🛎️ Activate MHP Immediately — No Lab Needed
- SBP <90 or MAP <65 + tachycardia; Shock Index >1.0 (HR/SBP)
- EBL >150 mL/min — soaked pads, pooling, watery suction
- ≥2 units in 30 min or >4 units anticipated
- Obstetrics: PPH >1000 mL with ongoing bleed, atony unresponsive, PAS rupture
- DIC signs: oozing from lines + mucosal bleeding + poor clot formation
Rule: Don't wait for INR or fibrinogen. Activate, then refine.
🩸 Strategy — Whole-Blood-Forward vs 1:1:1
Cycle A (Whole Blood Available)
1 unit WB → 1 unit FFP → 1 unit WB → 1 unit FFP (repeat)
Add Cryo 10 U early → target fibrinogen ≥1.5–2.0 g/L
Add Cryo 10 U early → target fibrinogen ≥1.5–2.0 g/L
Cycle B (PRBC + FFP Only)
PRBC : FFP = 1:1 until bleeding slows, then add Cryo
Avoid PRBC-only spirals → dilutional coagulopathy worsens hemorrhage
Avoid PRBC-only spirals → dilutional coagulopathy worsens hemorrhage
⏱️ TXA — Give Early or Not at All
- Trauma: 1 g IV over 10 min → 1 g over 8 h. Must start ≤3 h from injury.
- PPH: 1 g IV over 10 min → repeat 1 g if bleeding continues after 30 min or restarts within 24 h. Start ≤3 h from birth.
- Aminocaproic fallback: 4–5 g IV load over 1 h → 1 g/h for 8 h
🧊⚡🧪 The Lethal Triad — Make It Fixable
| Triad Element | Fix |
|---|---|
| Hypothermia (<36°C) | Warm all blood/fluids (37–40°C), forced-air blanket, raise OR temp. Every 1°C drop impairs enzymes. |
| Hypocalcemia (citrate) | Ca-gluconate 10% 10 mL IV q3–4 units (iCa²⁺ target >1.0 mmol/L). CaCl₂ 1 g via central if crashing. |
| Acidosis (pH <7.2) | Stop the bleed, ventilate adequately, perfuse with blood/FFP/cryo. Bicarb only if pH ≲7.1 after source control. |
🧠 Mantra
Warm → Calcium → pH — restore the clotting environment first.
🗂️ MHP Quick Cards
🟦 OR
- Call MHP; announce time zero
- Pack/Clamp/Compress; assign hemostasis lead
- Start Cycle A or B; TXA now; Cryo early
- Warm patient and blood; Ca²⁺ after 3–4 units
- Reassess q10 min: BP, UO, mental status, lactate
🟩 ER
- Two large-bore IVs; send type & screen (bedside label)
- Activate TXA + Cycle A/B; whole blood if available
- Warming blanket + fluid warmer; Ca²⁺ protocol
- Prepare transfer to OR/ICU; keep running totals
🟧 ICU
- Confirm ongoing source; surgical call if re-bleed
- Continue balanced replacement + cryo to targets
- MAP ≥65 with blood first; vasopressors only after volume
- Labs if available; but don't wait to treat
⛔ Stop Criteria
- SBP/MAP stable without escalating pressors
- Bleeding visibly slowed/stopped; suction clears
- Skin perfusion improves; UO ≥0.5 mL/kg/h
- Lactate falling; if labs: fibrinogen ≥1.5 g/L, INR ≤1.5, iCa²⁺ >1.0, T ≥36°C
06
Obstetric Hemorrhage — PAS, Rupture, Atony
| Cause (4Ts) | Mechanism | Classic Clues |
|---|---|---|
| Tone (Atony) | Uterine muscle fails to contract | Soft boggy uterus, blood gush |
| Tissue | Retained placenta/membranes | Fragments on inspection, US |
| Trauma | Genital tract or uterine tears | Bright red bleeding, firm uterus |
| Thrombin | Coagulopathy (DIC, HELLP, sepsis) | Oozing, non-clotting blood |
🩺 At Stage 2 (continuing bleed + tachycardia/pallor), activate MHP immediately. Waiting until Stage 3 is how PPH becomes mortality.
🩸 Intra-operative Playbook
| Step | Action | Key Detail |
|---|---|---|
| 1️⃣ | TXA 1 g IV before/at incision | Repeat once after 30 min if bleeding continues |
| 2️⃣ | Early whole blood (fresh) | 1 WB ↔ 1 FFP cycle |
| 3️⃣ | Cryo after 2 cycles | 10 U adult (1 U/10 kg) |
| 4️⃣ | Ca²⁺ replacement | 10 mL 10% Ca-gluconate q3–4 units WB |
| 5️⃣ | Warm everything | 37–40°C blood + forced air |
| 6️⃣ | Monitor fibrinogen visually | "Watery" blood → give cryo + FFP |
📊 Fibrinogen in Obstetrics — The Early Marker
In PPH, fibrinogen <2 g/L predicts progression to severe hemorrhage. Replace to ≥2 g/L early (10 U cryo ≈ 2–4 g fibrinogen). If cryo unavailable: FFP 15–20 mL/kg + TXA + Vitamin K 10 mg IV.
🩺 When Hysterectomy Is the Blood-Sparing Choice
Failed tone + no cryo/platelets + invasion → do not delay. Decision ideally <60 min from PPH recognition. Subtotal hysterectomy faster. Document indication and debrief family with empathy.
⚖️ In obstetric hemorrhage, saving the woman is the first act of motherhood.
07
Disseminated Intravascular Coagulation (DIC)
DIC is not a disease — it's the body's desperate, dying attempt to clot and bleed at once. Clots form everywhere, consuming factors and platelets → then bleeding erupts from everywhere.
🩸 Clinical Recognition Before Labs
| Bedside Clue | Interpretation |
|---|---|
| Persistent oozing from IV/surgical sites | Early microvascular consumption |
| Watery, non-clotting blood in suction | Factor depletion (esp. fibrinogen) |
| Petechiae / ecchymoses / mucosal bleeding | Platelet collapse |
| Darkening fingertips, acrocyanosis | Microthrombi formation |
| Falling BP despite transfusion | Capillary leak, shock coagulopathy |
Mnemonic: Ooze + Watery Blood + Shock = Treat for DIC. Do not wait for INR or fibrinogen report.
🧪 Lab Confirmation
| Parameter | DIC Trend | Typical Cutoff |
|---|---|---|
| Platelet count | Falling | <100 ×10⁹/L |
| PT / INR | Prolonged | INR >1.5–2.0 |
| Fibrinogen | Decreased | <1.0 g/L |
| D-dimer / FDPs | Markedly ↑ | >5× normal |
| Blood film | Schistocytes | Fragmented cells |
🧬 DIC vs Dilutional vs Liver Failure
| Feature | DIC | Dilutional | Liver Failure |
|---|---|---|---|
| Onset | Acute (hours) | During resuscitation | Gradual (days) |
| Platelets | ↓↓↓ | ↓ | ↓ or normal |
| Fibrinogen | ↓↓↓ (<1 g/L) | ↓ | Normal / ↑ |
| D-dimer | Very ↑↑↑ | Mild ↑ | ↑ |
| TXA use | Only trauma/PPH type | Consider | Avoid |
🧰 Bedside Algorithm — Treat While Labs Cook
- Identify: Bleeding + oozing + watery blood
- Treat trigger: deliver, debride, or drain
- Start FFP 15–20 mL/kg
- Add Cryo 10 U if fibrinogen <1.5 g/L suspected
- Use fresh WB if platelets absent
- Calcium + warmth + pH control
- TXA only in trauma-type or early obstetric pattern — avoid in sepsis DIC
- Reassess q30–60 min
🧬 Validated Bedside Coagulation Tests
20-Minute Whole Blood Clotting Test (20WBCT)
2 mL fresh venous blood into a clean, dry glass tube at room temp. Check at 20 minutes. No clot = severe coagulopathy/defibrination → urgent fibrinogen/FFP replacement. Validated by WHO snakebite management guidelines.
Warm Glass-Tube Test (7-min field standard)
2 mL venous blood in dry glass tube; hold warm in fist (~37°C); tip gently at 4 min, then every minute. Failure to clot by 7–8 min or friable clot → start FFP 15–20 mL/kg ± cryo. Must use glass, not plastic.
Excluded as non-validated: Paper-drop/halo test · Earlobe bleeding time (Duke/Ivy) — both unreliable and not predictive of peri-hemorrhage risk.
08
Transfusion Reactions — See It, Stop It, Fix It
First 60 Seconds — Universal Algorithm
STOP transfusion → KEEP IV open with NS → CALL for help → CHECK patient ID & bag → ASSESS ABCs
📋 Stop–Check–Support–Notify
- STOP transfusion (leave line in)
- CHECK identifiers (patient, unit, group, expiry, integrity)
- SUPPORT ABCs: oxygen, IV fluids, epinephrine kit ready
- NOTIFY blood bank: send post-reaction sample, DAT, hemolysis labs, urinalysis, culture
- DOCUMENT vitals q15 min; save bag/tubing
🧭 Bedside Triage by Dominant Sign
| Dominant Sign | First Thoughts | Next Actions |
|---|---|---|
| Fever/chills within 1–2 h | FNHTR vs sepsis vs hemolysis | Stop; antipyretic; culture + DAT + hemolysis labs |
| Hypotension + back/chest pain | Acute hemolytic until proven otherwise | Stop; NS bolus; urine >1 mL/kg/h; labs + DAT |
| Dyspnea + hypoxemia | TRALI vs TACO (see below) | Stop; CXR; ABG; diuretics only if TACO |
| Urticaria/itching | Mild allergic | Stop; antihistamine; may restart if resolved |
| Wheezing/stridor/hypotension | Anaphylaxis | IM epinephrine 0.3–0.5 mg; airway; steroids |
| Fever >39°C, rigors, shock | Septic reaction | Stop; broad-spectrum Abx; culture unit + patient; ICU |
🌬️ TRALI vs TACO — The Bedside Split
| Feature | TRALI | TACO |
|---|---|---|
| BP | Normal/low | High or rising |
| JVP/Edema | Usually normal | Elevated JVP, S3, peripheral edema |
| Fever | Common | Rare |
| CXR | Bilateral non-cardiogenic edema | Cardiogenic edema |
| BNP | Usually normal | Elevated |
| Diuretics | Minimal response | Improves |
| Treatment | Supportive ventilation; avoid diuretics | IV furosemide; slow future transfusions |
09
Special Populations & Ethics in Scarcity
| Scenario | Hb Target | First Move | Add-Ons | Red Flags |
|---|---|---|---|---|
| ACS/ischemia | 8–9 | Split RBC aliquots 150–200 mL | Diuretic cover | TACO risk |
| Frail elderly | 7–8 (context) | Slow, warm transfusion | Ca²⁺ q3–4 U | Fluid overload |
| Chronic ICU anemia | ~7 | Investigate / IV iron | Avoid reflex RBC | Missed bleeding |
| Liver failure bleed | — | Fibrinogen → ≥1.5–2.0 g/L first | FFP 10–15 mL/kg, Vit K | Volume overload |
| Jehovah's Witness | — | TXA + meticulous hemostasis | Factor/fibrinogen concentrates if accepted | Consent clarity |
| Neuraxial plan | — | Check plt/INR/fibrinogen | Delay if low | Epidural hematoma |
⚖️ Triage Ethics — Who Gets O⁻ vs O⁺
- Greatest immediate survival benefit — physiology over first-come
- Protect the future: O⁻ reserved for women of childbearing potential and children; O⁺ for adult males/postmenopausal
- Proportionality & review: senior clinician + blood bank jointly log the decision
- Equity: no discrimination by social status, ability to pay, or non-clinical traits
- If only one O⁻ unit left + two exsanguinating patients → prioritize fertile female/child; give O⁺ to adult male
🕊️ Jehovah's Witness Pathways
- Document wishes (signed form). Ask which fractions are acceptable (many accept albumin, clotting factors, cell-saver sometimes)
- Optimize pre-op: iron, B12, folate, EPO if time allows
- Intra-op: meticulous hemostasis, TXA, topical hemostats, hypotensive anesthesia where safe
- Minimize phlebotomy post-op; pediatric micro-tubes
10
Logistics, Stewardship & Quality Assurance
🧮 Cold-Chain Integrity
| Component | Storage Temp | Transport / Post-Thaw |
|---|---|---|
| RBC / Whole Blood | 2–6°C | Validated coolers + ice packs; start within 30 min of leaving fridge |
| FFP / Cryo (frozen) | ≤−18°C | Post-thaw FFP 1–6°C ≤24 h; pooled Cryo at RT ≤6 h |
| Platelets | 20–24°C with agitation | ≤5 days; never refrigerate |
📉 Monthly Audit — Five Behaviors
| Indicator | Target |
|---|---|
| % bedside samples correctly labeled | ≥99.5% |
| % transfusions with documented indication | ≥95% |
| Reaction rate per 1,000 units | <3 |
| MHP activation → time-to-first-unit | ≤10–15 min |
| Return discard rate from theater/wards | <2% |
11
Checklists, Calculators & Tear-Outs
🧮 Fibrinogen & Cryo Quick-Math
Fibrinogen Deficit Calculation
Fibrinogen deficit (g) = (Target − Measured) × Plasma Volume (L)
Plasma Volume ≈ 40 mL/kg
1 bag cryo ≈ 200–250 mg fibrinogen
Dose (U) = [weight × (Target − Measured)] ÷ 0.25
Example: 70 kg, fibrinogen 0.8 → target 2.0 → ≈10 U pool
Plasma Volume ≈ 40 mL/kg
1 bag cryo ≈ 200–250 mg fibrinogen
Dose (U) = [weight × (Target − Measured)] ÷ 0.25
Example: 70 kg, fibrinogen 0.8 → target 2.0 → ≈10 U pool
💉 TXA / Aminocaproic Ladder
| Drug | Adult | Pediatric | Notes |
|---|---|---|---|
| TXA | 1 g IV over 10 min → repeat 1 g (≤3 h window) | 15 mg/kg IV | Do NOT give >3 h post-trauma/PPH |
| Aminocaproic | 4–5 g IV load → 1 g/h infusion | 100 mg/kg load → 33 mg/kg/h | Backup if TXA unavailable |
🔍 Visual EBL Aids
| Visual Cue | Approx. Loss |
|---|---|
| 1 fully soaked 30×30 cm pad | ≈250 mL |
| 1 surgical towel saturated | ≈400 mL |
| Blood pooling 10 cm diameter on floor | ≈500 mL |
| 1 full suction canister (1000 mL) | 1 L |
| "Paint-brush" arterial spray | >150 mL/min |
Use weighed pads when possible: 1 g = 1 mL blood.
🧭 10-Point "Before You Hang Blood"
- 1. Verify patient ID (two clinicians)
- 2. Check unit type, group, expiry, appearance
- 3. Baseline vitals
- 4. Document indication
- 5. Warm line & blood if rapid/large
- 6. Have reaction drugs at hand
- 7. Set NS only (no LR/D5)
- 8. Inform team of start time
- 9. Monitor q15 min first hour
- 10. Record stop time + unit number
12
Case-Based Mastery — Five High-Yield Scenarios
Case 1 · Twin Atony — No Platelets On Site
District OR — Inventory: Fresh WB ×4, FFP ×6, no platelets, cryo in 40 min
T0: Boggy uterus, EBL 1200 mL, HR 128, MAP 58. T+2: Oxytocin + TXA 1 g IV. T+5: MHP → WB:FFP 1:1. T+15: Watery suction → Cryo 10 U ordered + Ca-gluconate. T+35: Cryo given, temp 36.2°C — bleeding slows.
Key lessons: Early TXA + fresh WB + cryo anticipated before labs. No PRBC-only spiral. Calcium and warming started with first cycle.
Case 2 · Percreta in District OR — Pre-Planned Path Saves Life
Elective PAS — Stock: WB ×6, FFP ×8, Cryo ×10
Pre-op: Two large-bore IVs, warmers ready, TXA 1 g before incision. Intra-op: Placenta left in situ → subtotal hysterectomy decision early. WB:FFP 1:1 throughout; Cryo after 2 cycles. EBL 2200 mL, MAP stable, no DIC.
Key lessons: Scheduled emergency mindset. No piecemeal dissection. Pre-committed to hysterectomy for blood-sparing.
Case 3 · Polytrauma Unknown Type — When to Switch to Type-Specific
32yo male MVC — Blood bank: O⁺ WB ×4, O⁻ WB ×2, A⁺ available in 20 min
T0: O⁺ WB started (adult male). T+12: FFP alternated 1:1. T+25: Typed A⁺ confirmed on second sample → switch to A⁺ WB after NS flush. T+40: TXA 1 g IV (still within window). No hemolytic reaction.
Key lessons: O⁺ acceptable for exsanguinating adult male. Switch only after two confirmations + line flush. Never mix O and A simultaneously.
Case 4 · Sepsis-DIC in ICU — Bleeding with Rising Lactate
58yo female, septic shock, oozing lines, watery suction, labs delayed
T0: Clinical DIC → FFP 15 mL/kg + warmth + Ca²⁺. T+10: Warm glass-tube test → friable clot at 8 min → Cryo 10 U. T+40: Oozing slows, UO improves. Labs later: fibrinogen 0.9 → 1.7 g/L.
Key lessons: Treat while labs cook. No TXA (sepsis-driven DIC). Hemostasis-first approach. Fibrinogen correction reversed microvascular bleed.
Case 5 · Neonatal Exchange — Resource-Thin Nursery
3-day-old, hemolytic disease, critical bilirubin — O⁻ CMV-safe blood available
160–180 mL/kg via umbilical catheter. PRBC:Plasma 1:1 (WB unavailable). Ca-gluconate 100 mg/kg in divided doses. Monitor K⁺, glucose, temp throughout. No bradycardia or hypothermia complications.
Key lessons: Exchange = logistics + physiology: warmth, calcium, glucose, balanced blood. Pause if bradycardia or K⁺ rising.
13
15 High-Difficulty MCQs
1. In PPH (EBL 2.5 L), "watery" suction blood is seen, fibrinogen 0.8 g/L, no platelets. Most effective immediate step?
- A. Give TXA 1 g IV and wait for lab confirmation
- B. Transfuse 2 U PRBCs rapidly
- C. Administer 10 U cryoprecipitate + continue WB:FFP 1:1
- D. Give Vitamin K 10 mg IV
2. A 60yo man with septic shock shows oozing at IV sites. Which bedside test best confirms DIC in a rural setting?
- A. 20-min whole blood clotting test (20WBCT)
- B. Bleeding time (Duke)
- C. Filter-paper halo
- D. Earlobe pin-prick
3. During massive transfusion, the most reliable indicator to decide when to give calcium is:
- A. Serum total calcium <8 mg/dL
- B. Ionized Ca²⁺ <1.0 mmol/L or after every 3–4 U blood
- C. ECG QTc prolongation
- D. pH <7.2
4. Trauma patient: 6 U PRBCs, no plasma, INR 2.5, fibrinogen 0.9 g/L, no platelets. Best next action?
- A. Continue PRBCs until Hb normalizes
- B. Give FFP 15 mL/kg + Cryo 10 U immediately
- C. Give TXA 1 g IV only
- D. Start heparin infusion
5. Regarding 1:1:1 resuscitation in low-resource hospitals, which statement is TRUE?
- A. It cannot be applied without platelets
- B. Whole blood + FFP cycles mimic 1:1:1 when platelets are absent
- C. It should start only after labs confirm INR >1.5
- D. It requires cold platelets to be effective
6. A 75yo with diastolic HF needs 1 U PRBC for Hb 6.8. Best practice?
- A. Transfuse entire unit rapidly
- B. Split unit into 150–200 mL aliquots with diuretic cover
- C. Give TXA prophylactically
- D. Warm the patient only if cold
7. Patient develops acute dyspnea + hypotension 30 min into transfusion. CXR: bilateral infiltrates, BNP normal. Diagnosis?
- A. TACO
- B. TRALI
- C. FNHTR
- D. AHTR
8. Which therapy should be AVOIDED in sepsis-driven DIC with microthrombi?
- A. FFP
- B. Cryoprecipitate
- C. TXA
- D. Calcium supplementation
9. Two patients: 30yo female + 60yo male, both exsanguinating. Only 2 U O⁻ and 6 U O⁺ WB available. Who gets which?
- A. Both O⁻
- B. Female O⁺, male O⁻
- C. Female O⁻, male O⁺
- D. Random allocation
10. Patient's INR remains 2.2 after 4 U FFP but fibrinogen <1 g/L. What's next?
- A. Additional FFP
- B. Cryoprecipitate 10 U
- C. Vitamin K 10 mg IV
- D. TXA 1 g IV
11. Which transfusion practice most reduces risk of acute hemolytic reaction?
- A. Warming blood to 37°C
- B. Use of leukoreduced units
- C. Two-person bedside ID check before hanging
- D. Giving diuretics with each unit
12. In neonatal exchange transfusion, which combination best mimics whole blood when WB unavailable?
- A. PRBC : FFP = 1:1
- B. PRBC : NS = 1:1
- C. PRBC : Cryo = 2:1
- D. PRBC : FFP : Cryo = 2:1:1
13. In a bleeding cirrhotic, the most predictive trigger for cryo is:
- A. INR >2
- B. Fibrinogen <1.5 g/L
- C. Platelet <100 ×10⁹/L
- D. PT >18 s
14. After 8 U cold blood rapidly: pH 7.05, iCa²⁺ 0.7, temp 34°C. First corrective priority?
- A. Sodium bicarbonate infusion
- B. Active warming + IV calcium replacement
- C. TXA 1 g IV
- D. Dopamine infusion
15. 25yo obstetric patient: atony, fibrinogen 1 g/L, INR 1.6, Hb 6 g/dL. Stock: WB ×3, FFP ×3, no cryo. Best strategy?
- A. Transfuse PRBCs only
- B. Whole blood + FFP alternating, TXA 1 g IV
- C. Wait for cryo delivery before transfusion
- D. Give Vit K and monitor
📋 Answer Key
1C
2A
3B
4B
5B
6B
7B
8C
9C
10B
11C
12A
13B
14B
15B
Explanations
Q1 → C
Low fibrinogen is the earliest critical deficit; cryo + balanced WB/FFP restores clot architecture before PRBCs or Vit K help.
Q2 → A
20WBCT detects incoagulable blood (defibrination); all others are non-validated or obsolete.
Q3 → B
Ionized calcium, not total Ca, reflects citrate toxicity; routine 10 mL 10% Ca-gluconate q3–4 U prevents coagulopathy.
Q4 → B
Dilutional coagulopathy; balanced replacement with factors and fibrinogen is lifesaving.
Q5 → B
WB + FFP approximates balanced resuscitation by providing red cells + factors + early platelets.
Q6 → B
Slow, aliquoted transfusion with loop diuretic prevents TACO in frail cardiac patients.
Q7 → B
TRALI = non-cardiogenic pulmonary edema within 6 h, normal BNP, minimal diuretic response.
Q8 → C
TXA may worsen microvascular thrombosis in sepsis DIC; use only in trauma-type fibrinolytic DIC.
Q9 → C
O⁻ preserved for women of childbearing potential; O⁺ is safe for adult males.
Q10 → B
Persistent coagulopathy with low fibrinogen → cryo provides concentrated fibrinogen; FFP volume alone insufficient.
Q11 → C
Misidentification causes most fatal hemolytic events.
Q12 → A
Equal PRBC + FFP restores both cells and factors for safe neonatal exchange.
Q13 → B
Fibrinogen deficit is the earliest and most correctable defect in liver-related bleeding.
Q14 → B
Hypocalcemia + hypothermia complete the lethal triad; both must be corrected before further products.
Q15 → B
WB + FFP approximates 1:1:1 balance; TXA controls fibrinolysis while awaiting cryo.
🧠 Clinical Reflection
The mark of mastery isn't transfusing fast — it's transfusing right. Repeat these scenarios in drills until "WB ↔ FFP ↔ Cryo + TXA + Ca²⁺ + Warmth" becomes muscle memory.
Knowledge is the only transfusion that multiplies. Share it.