LOINC Code 51603-9: Cytochrome B5 reductase Ql (RBC)

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 Cytochrome b5 reductase. 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: Both

What it does not mean

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

Key facts

• Cytochrome B5 reductase [Presence] in Red Blood Cells
• Cytochrome b5 reductase
• B5 Reductase, NADH-Cytochrome; Chemistry; CyB5 Reduct; cyt; Erythrocytes; Methemoglobin reductase; NADH Cytochrome B5 Reductase; NADH Methemoglobin Reductase; NADH-Cytochrome B5 Reductase; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Red blood cells; Red blood corpusles; Screen

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