LOINC Code 4544-3: Hematocrit Auto (Bld) [Volume fraction]

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/Blood. It is commonly used with the system or sample type Bld.

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: Both
• Method: Automated count

What it does not mean

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

Key facts

• Hematocrit [Volume Fraction] of Blood by Automated count
• Erythrocyte/Blood
• This is the test that referral labs will report when hematocrit alone is ordered.
• Auto; Automated detection; Blood; Discocyte; Elec; Elect; Electr; Erc; Erythrocytes; HEMATOLOGY/CELL COUNTS; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; RBC; Red blood cell; Red blood cells; Red blood corpuscle; Red blood corpusles; Red cell; Red cells; Volfr; Volume fraction; WB; Whole blood

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