In order to calculate the allowable blood loss (ABL) for your patient you first need to know the patients estimated blood volume (EBV), the patient’s hematocrit (Hct), and the minimum hematocrit you’ll allow (mHct). With these variables the calculation is relatively simple:
[latex]
ABL = EBV*\frac{Hct-mHct}{Hct}
[/latex]
ABL = EBV*\frac{Hct-mHct}{Hct}
[/latex]
