It is possible to estimate the amount of patient blood in suctioned fluid that is a mixture of blood with other fluids. Knowing this volume can help to guide blood replacement therapy.



(1) volume of suction fluid in mL

(2) hematocrit of the suction fluid in percent

(3) hematocrit of the patient's blood determined at the same time


(hematocrit of suction fluid) / (hematocrit of patient's blood) =

= (volume of patient blood) / (volume of suction fluid)


volume of blood in the suction fluid =

= (volume of suction fluid) * (hematocrit of suction fluid) / (hematocrit of the patient's blood)


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