Use Hematocrit % when you need to compute hematocrit percent as the red cell volume divided by the total blood sample volume times 100. Enter Red cell volume and Blood sample volume using the definitions and units below so the result can be reproduced.

Red cell volume

A finite measured or assumed value, expressed in mL.

Blood sample volume

A finite measured or assumed value, expressed in mL.

The published tool contract uses this rule: Compute hematocrit percent as the red cell volume divided by the total blood sample volume times 100.^[1]

Hematocrit

The calculated hematocrit in %.

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.

Retain the original Red cell volume and Blood sample volume values and their units alongside the result. Rule Of Three Hct is useful when you instead need to approximate hematocrit from hemoglobin with the rule of three: each g/dL of hemoglobin contributes about three percent hematocrit. Canopy Cover % provides another view by helping you compute canopy cover as canopy area divided by total plot area times 100.

• Rule Of Three Hct

  Approximate hematocrit from hemoglobin with the rule of three: each g/dL of hemoglobin contributes about three percent hematocrit.

• Canopy Cover %

  Compute canopy cover as canopy area divided by total plot area times 100.

• Flow Positive %

  Compute the percentage of positive events recorded by a flow cytometry run as positive events divided by total events times one hundred.