What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveObservation

LOINC Code 1916-6: AST/Alanine aminotransferase [Catalytic ratio]

Name: LOINC Code 1916-6: AST/Alanine aminotransferase [Catalytic ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

1916-6 is a LOINC code used to identify AST/Alanine aminotransferase [Catalytic ratio] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Aspartate aminotransferase/Alanine aminotransferase. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 25 May 2026

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/Alanine aminotransferase. 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: Observation

What it does not mean

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

Key facts

Aspartate aminotransferase/Alanine aminotransferase [Enzymatic activity ratio] in Serum or Plasma
Aspartate aminotransferase/Alanine aminotransferase
Ala; Alanine transaminase; ALAT; Alpha alanine; ALT; Asp; Aspartate amino transferase; Aspartate transaminase; Aspartic acid; AST; Catalytic Concentration Ratio; Catalytic Ratio; CCrto; Chemistry; Enzymatic activity ratio; Glutamic oxaloacetic transaminase; Glutamic-pyruvic transferase; L-alanine; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SGOT; SGPT; SR

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

705114005SNOMED CT mapping for AST/Alanine aminotransferase [Catalytic ratio] (1916-6)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

AST/Alanine aminotransferase [Catalytic ratio]Aspartate aminotransferase/Alanine aminotransferase [Enzymatic activity ratio] in Serum or PlasmaAST/ALT SerPl-cRtoAspartate aminotransferase/Alanine aminotransferaseCHEMAspartate Aminotransferase (AST; SGOT)/Alanine Aminotransferase, BloodCRto

Frequently asked questions

Code details

Code1916-6

SystemLOINC

Display nameAST/Alanine aminotransferase [Catalytic ratio]

DescriptionAspartate aminotransferase/Alanine aminotransferase

Short nameAST/ALT SerPl-cRto

ComponentAspartate aminotransferase/Alanine aminotransferase

PropertyCRto

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example unitsU/U

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.73

Consumer names

Aspartate Aminotransferase (AST; SGOT)/Alanine Aminotransferase, Blood

Part names

Aspartate aminotransferase/Alanine aminotransferaseCRtoPtSer/PlasQnCatalytic RatioPoint in time (spot)Serum or Plasma

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.