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LOINC Code 16325-3: ALT/Aspartate aminotransferase [Catalytic ratio]

16325-3 is a LOINC code used to identify ALT/Aspartate 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 Alanine aminotransferase/Aspartate 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/Aspartate 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/Aspartate aminotransferase [Enzymatic activity ratio] in Serum or Plasma
  • Alanine aminotransferase/Aspartate 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.

Common synonyms

ALT/Aspartate aminotransferase [Catalytic ratio]Alanine aminotransferase/Aspartate aminotransferase [Enzymatic activity ratio] in Serum or PlasmaALT/AST SerPl-cRtoAlanine aminotransferase/Aspartate aminotransferaseCHEMAlanine Aminotransferase (ALT; SGPT)/Aspartate Aminotransferase, BloodCRto

Frequently asked questions

Code details

Code16325-3
SystemLOINC
Display nameALT/Aspartate aminotransferase [Catalytic ratio]
DescriptionAlanine aminotransferase/Aspartate aminotransferase
Short nameALT/AST SerPl-cRto
ComponentAlanine aminotransferase/Aspartate aminotransferase
PropertyCRto
TimingPt
System (specimen)Ser/Plas
ScaleQn
ClassCHEM
Example unitsU/U
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0l
Last changed2.73

Consumer names

Alanine Aminotransferase (ALT; SGPT)/Aspartate Aminotransferase, Blood

Part names

Alanine aminotransferase/Aspartate 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.