LOINC Code 54500-4: AST.macromolecular/Aspartate aminotransferase.total [Catalytic 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 Aspartate aminotransferase.macromolecular/Aspartate aminotransferase.total. It is commonly used with the system or sample type Ser/Plas.

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

• Aspartate aminotransferase.macromolecular/Aspartate aminotransferase.total in Serum or Plasma
• Aspartate aminotransferase.macromolecular/Aspartate aminotransferase.total
• Asp; Aspartate amino transferase; Aspartate transaminase; Aspartic acid; AST; AST Macro; AST.total; Catalytic Fraction; Chemistry; Glutamic oxaloacetic transaminase; Percent; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SGOT; SR; Tot; Totl

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.

Related SNOMED CT concepts

Related observations and tests

Common synonyms

Frequently asked questions