LOINC Code 21000-5: Erythrocyte distribution width Auto (RBC) [Entitic vol]

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Erythrocyte distribution width. It is commonly used with the system or sample type RBC.

When is it used?

• Used in lab systems, EHRs, and clinical data exchange.
• May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
• Status: ACTIVE
• Order vs observation: Observation
• Method: Automated count

What it does not mean

• The code identifies the observation or test, not the actual result.

Key facts

• Erythrocyte distribution width [Entitic volume] by Automated count
• Erythrocyte distribution width
• The RDW-SD is determined from the RBC volume distribution curve. It is calculated from the width of the curve at 20% of the peak count.
• Auto; Automated detection; Discocyte; Elec; Elect; Electr; Entitic volume; Erc; Erythrocyte morphology index; Erythrocytes; HEMATOLOGY/CELL COUNTS; Point in time; QNT; Quan; Quant; Quantitative; Random; RBC; RCMI; RDW; RDW-SD; Red blood cell; Red blood cells; Red blood corpuscle; Red blood corpusles; Red cell; Red cells

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Frequently asked questions