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.

LOINCActiveBoth

LOINC Code 1742-6: ALT [Catalytic activity/Vol]

Name: LOINC Code 1742-6: ALT [Catalytic activity/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

1742-6 is a LOINC code used to identify ALT [Catalytic activity/Vol] 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 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 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: Both

What it does not mean

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

Key facts

Alanine aminotransferase [Enzymatic activity/volume] in Serum or Plasma
Alanine aminotransferase
Ala; Alanine transaminase; ALAT; Alpha alanine; ALT; Catalytic Concentration; Chemistry; Glutamic-pyruvic transferase; Hepatology; L-alanine; Liver; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SGPT; SR; UniversalLabOrders

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 ALT [Catalytic activity/Vol] (1742-6)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

ALT [Catalytic activity/Vol]Alanine aminotransferase [Enzymatic activity/volume] in Serum or PlasmaALT SerPl-cCncAlanine aminotransferaseCHEMAlanine Aminotransferase (ALT; SGPT), BloodCCnc

Frequently asked questions

Code details

Code1742-6

SystemLOINC

Display nameALT [Catalytic activity/Vol]

DescriptionAlanine aminotransferase

Short nameALT SerPl-cCnc

ComponentAlanine aminotransferase

PropertyCCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example unitsarb U/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.73

Consumer names

Alanine Aminotransferase (ALT; SGPT), Blood

Part names

Alanine aminotransferaseCCncPtSer/PlasQnCatalytic ConcentrationPoint 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.