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Allowable Blood Loss (ABL) Calculator

Online calculator to find the maximum loss of blood allowable for a person. It is based on initial and final hematocrit, weight and average blood volume.

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ABL Calculation

Gender: Male Female
Weight: kg
Hi:  %
Hf:  %
Average Blood Volume: ml/kg

Allowable Blood LossmL

 
   
  
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Formula:
ABL = EBV x [ ( Hi - Hf ) / Hav ]

Where,
   ABL =Actual Blood loss,
   EBV = Estimated Blood Volume,
   Hi = initial Hematocrit,
   Hf = final Hematocrit,
   Hav = average of (Hi and Hf).

During surgery, allowable blood loss (ABL) calculator can be used by the surgeons to determine a patient's blood loss limit. This calculation can be applied for haemorrages too.