Blood Volume Calculation (Nadler Formula)
Estimates total blood volume (TBV) using Nadler formula based on sex, height, and weight. Used to calculate safe maximum blood loss and red cell exchange volumes.
Score interpretation
→ Total Blood Volume (TBV) estimated. Maximum Allowable Blood Loss (MABL) = TBV x (Hb_current - Hb_target) / Hb_current. Red cell exchange volume for sickle cell = target fraction exchange x TBV. Normal: males ~75 mL/kg, females ~65 mL/kg.
→ TBV estimated in normal range. MABL = TBV x (Current Hb - Target Hb) / Current Hb. Use to guide transfusion strategy, cell salvage planning, and red cell exchange in haemoglobinopathies. Consider erythrocytapheresis volume.
→ Large TBV estimated. MABL = TBV x (Current Hb - Target Hb) / Current Hb. Review patient BMI for accuracy; consider obesity-adjusted blood volume. Consult haematology for exchange transfusion planning.
Interpretation bands for the Blood Volume. Apply clinical judgement and local guidance.
References
Related
Curated clinical cross-links plus same-class fallbacks.
- Hydroxycarbamide (Hydroxyurea) · Cytoreductive agent / Sickle cell disease / CML
- Crizanlizumab · P-selectin Inhibitor — Sickle Cell Disease
- Voxelotor · Haemoglobin S Polymerisation Inhibitor — Sickle Cell Disease
- Insulin (IV Infusion — ICU Glucose Control) · Insulin — ICU Glucose Management
- Sodium Chloride 3% (Hypertonic Saline) · Hypertonic Electrolyte Solution — ICP/Hyponatraemia Management
- Gelatin (succinylated) · Colloid plasma volume expander
- 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.