Estimated blood loss was calculated by following method. Number of cotton balls used = a Approximate amount of blood a cotton ball had = 2.5 ml Amount of blood in cotton balls (c) = 2.5 × (a) No of gauzes used = b Approximate amount of blood a gauze had = 10 ml Amount of blood in gauzes (d) = 10 × (b) Quantity of blood in cotton balls & gauze (A) = (c + d) Amount of fluid (Blood and known quantity of saline) collected in the suction bottle = e Amount of saline used = f Quantity of blood in suction bottle (B) = (e − f) Total quantity of blood lost (Estimated blood loss) = A + B. |