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Estimated Blood Loss

In the Equation of the Beholder

Wanderer, Jonathan P., MD, MPhil; Nathan, Naveen, MD

doi: 10.1213/ANE.0000000000002251
Infographics: Infographic

Vanderbilt University School of Medicine (

Northwestern University Feinberg School of Medicine (

The Infographic is composed by Jonathan P. Wanderer, MD, MPhil, Vanderbilt University School of Medicine (, and Naveen Nathan, MD, Northwestern University Feinberg School of Medicine ( Illustration by Naveen Nathan, MD.



Accurately quantifying surgical blood loss can be critical as a clinical trial outcome, and understanding estimated blood loss is important to patient care. In addition to visual estimates, anthropometric and laboratory data can be used to estimate surgical blood loss. In this infographic, we review recent work that utilized an existing data set to compare directly measured surgical blood loss to 3 previously described methods of estimating surgical blood loss and one newly derived approach.1

Hct indicates hematocrit; EBV, estimated blood volume; Hcti, initial hematocrit; Hctf, final hematocrit.

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1. Lopez-Picado A, Albinarrate A, Barrachina B. Determination of perioperative blood loss: accuracy or approximation? Anesth Analg. 2017;125:280–286.
© 2017 International Anesthesia Research Society