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 2742-5: Angiotensin converting enzyme [Catalytic activity/Vol]

Name: LOINC Code 2742-5: Angiotensin converting enzyme [Catalytic activity/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

2742-5 is a LOINC code used to identify Angiotensin converting enzyme [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 Angiotensin converting enzyme. 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 Angiotensin converting enzyme. 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

Angiotensin converting enzyme [Enzymatic activity/volume] in Serum or Plasma
Angiotensin converting enzyme
ACE; AGT; Angio convert enzy; Angiotensin I converting enzyme; Carboxycathepsin; Catalytic Concentration; Chemistry; Dipeptidylcarboxypeptidase; Enz; Enzymes; Kininase II; Lung; PDPA; Peptidase P; Peptidyl dipeptidase A; Pl; Plasma; Plsm; Point in time; Proangiotensin; Pulmonary; Pulmonology; QNT; Quan; Quant; Quantitative; Random; Respiratory; SerP; SerPl; SerPlas; Serum; Serum or plasma; 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 Angiotensin converting enzyme [Catalytic activity/Vol] (2742-5)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Angiotensin converting enzyme [Catalytic activity/Vol]Angiotensin converting enzyme [Enzymatic activity/volume] in Serum or PlasmaACE SerPl-cCncAngiotensin converting enzymeCHEMAngiotensin converting enzyme, BloodCCnc

Frequently asked questions

Code details

Code2742-5

SystemLOINC

Display nameAngiotensin converting enzyme [Catalytic activity/Vol]

DescriptionAngiotensin converting enzyme

Short nameACE SerPl-cCnc

ComponentAngiotensin converting enzyme

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

Angiotensin converting enzyme, Blood

Part names

Angiotensin converting enzymeCCncPtSer/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.