haematology anaesthesia
Maximum Allowable Blood Loss
Calculates the maximum blood loss a patient can sustain before a blood transfusion would be required, based on starting and minimum acceptable haematocrit.
Used in: Anaemia
Score interpretation
Very Limited 0–500
Very limited blood loss tolerable before transfusion threshold
→ Ensure blood products available pre-operatively; consider cell salvage
Moderate Tolerance ≥ 501
Moderate tolerance for blood loss
→ Group and screen; cell salvage advisable for major procedures
Reasonable Tolerance ≥ 1001
Reasonable tolerance for blood loss
→ Standard pre-operative preparation
Interpretation bands for the Max Blood Loss. Apply clinical judgement and local guidance.
References
- Gross JB. Estimating allowable blood loss: corrected for dilution. Anesthesiology. 1983;58(3):277–280.
Related
Curated clinical cross-links plus same-class fallbacks.
Calculators
- Corrected Count Increment (CCI) for Platelet Transfusion · Transfusion Medicine
- ABC Score for Massive Transfusion · Transfusion Medicine
- Blood Volume Calculation (Nadler Formula) · Transfusion Medicine
- Sickle Cell Exchange Transfusion Volume · Transfusion Medicine
- Cryoprecipitate Dose Calculator for Fibrinogen Replacement · Transfusion Medicine
- Fresh Frozen Plasma (FFP) Dose Calculator · Transfusion Medicine
Drugs
- Ketamine (Anaesthesia/Sedation) · Dissociative Anaesthetic (NMDA Receptor Antagonist)
- Morphine (IV/IM — Anaesthesia/ICU) · Strong Opioid Analgesic
- Suxamethonium (Anaesthesia/RSI) · Depolarising Neuromuscular Blocking Agent
- Rocuronium (Anaesthesia/RSI) · Non-Depolarising Neuromuscular Blocking Agent
- Fentanyl (IV — Anaesthesia/ICU) · Opioid Analgesic (Short-Acting)
- Lidocaine (IV — Anaesthesia/ICU) · Local Anaesthetic / Antiarrhythmic (Class Ib)
Pathways
- Major Haemorrhage / Massive Transfusion · BCSH; RCOA; RCEM; RCS — BCSH Guidelines
- Anaemia Investigation · BSH / NICE
- Splenomegaly Workup · BSH; BMJ Best Practice
- Deep Vein Thrombosis Diagnosis and Treatment · NICE CG144 / NICE NG158
- Sickle Cell Crisis · BSH 2021 / BCSH
- Neutropenic Sepsis · NICE CG151 2012 / ESMO
Decision support only — verify against a current formulary, NICE, or your local guideline before clinical use.