Use Red Cell Mass mL when you need to compute the red cell mass as blood volume times the hematocrit fraction. Enter Blood volume and Hematocrit fraction using the definitions and units below so the result can be reproduced.

Blood volume

A finite measured or assumed value, expressed in mL.

Hematocrit fraction

A finite measured or assumed value from 0 through 1.

The published tool contract uses this rule: Compute the red cell mass as blood volume times the hematocrit fraction.

Red cell mass

The calculated red cell mass in mL.

A ratio or percentage can conceal the scale of its numerator and denominator and becomes sensitive to measurement error when the denominator is small. It is informational and cannot diagnose a condition, select treatment, or replace professional interpretation of the original measurements. Hematocrit fraction must remain between 0 and 1.

Retain the original Blood volume and Hematocrit fraction values and their units alongside the result. RDW-CV Percent is useful when you instead need to compute red cell distribution width CV from RBC volume standard deviation and MCV. Red Cell Concentration provides another view by helping you convert cells counted in a hemocytometer square into a red cell concentration in millions per microliter using countedCells x dilutionFactor / 10.

• RDW-CV Percent

  Compute red cell distribution width CV from RBC volume standard deviation and MCV.

• Red Cell Concentration

  Convert cells counted in a hemocytometer square into a red cell concentration in millions per microliter using countedCells x dilutionFactor / 10.

• MCV Cross Check

  Cross check a reported MCV against the computed mean corpuscular volume hematocrit x 10 / RBC and flag agreement within two femtolitres.