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 1831-7: Alpha 1 antitrypsin ZZ [Mass/Vol]

Name: LOINC Code 1831-7: Alpha 1 antitrypsin ZZ [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

1831-7 is a LOINC code used to identify Alpha 1 antitrypsin ZZ [Mass/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 Alpha 1 antitrypsin.ZZ. 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 Alpha 1 antitrypsin.ZZ. 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

Alpha 1 antitrypsin ZZ [Mass/volume] in Serum or Plasma
Alpha 1 antitrypsin.ZZ
A1; A1A; A1AT; A-1-AT; A1-AT; A1AT ZZ; AAT; Alfa; Alpha-1-antitrypsin.total; Alpha-1-protease inhibitor; Alpha-1-proteinase inhibitor; Alpha-1-trypsin inhibitor; Chemistry; Genetics; Hepatology; Heredity; Heritable; i; Inherited; Level; Liver; Lung; Mass Concentration; Pl; Plasma; Plsm; Point in time; Pulmonary; Pulmonology; QNT; Quan; Quant; Quantitative; Random; Respiratory; SerP; SerPl; SerPlas; Serum; Serum or plasma; 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 Alpha 1 antitrypsin ZZ [Mass/Vol] (1831-7)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Alpha 1 antitrypsin ZZ [Mass/Vol]Alpha 1 antitrypsin ZZ [Mass/volume] in Serum or PlasmaA1AT ZZ SerPl-mCncAlpha 1 antitrypsin.ZZCHEMAlpha 1 Antitrypsin ZZ, BloodMCnc

Frequently asked questions

Code details

Code1831-7

SystemLOINC

Display nameAlpha 1 antitrypsin ZZ [Mass/Vol]

DescriptionAlpha 1 antitrypsin.ZZ

Short nameA1AT ZZ SerPl-mCnc

ComponentAlpha 1 antitrypsin.ZZ

PropertyMCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example unitsg/L

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.73

Consumer names

Alpha 1 Antitrypsin ZZ, Blood

Part names

Alpha 1 antitrypsin.ZZMCncPtSer/PlasQnAlpha 1 antitrypsin ZZMass 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.