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 1827-5: Alpha 1 antitrypsin MS [Mass/Vol]

Name: LOINC Code 1827-5: Alpha 1 antitrypsin MS [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

1827-5 is a LOINC code used to identify Alpha 1 antitrypsin MS [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.MS. 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.MS. 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 MS [Mass/volume] in Serum or Plasma
Alpha 1 antitrypsin.MS
A1; A1A; A1AT; A-1-AT; A1-AT; A1AT MS; 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 MS [Mass/Vol] (1827-5)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

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

Frequently asked questions

Code details

Code1827-5

SystemLOINC

Display nameAlpha 1 antitrypsin MS [Mass/Vol]

DescriptionAlpha 1 antitrypsin.MS

Short nameA1AT MS SerPl-mCnc

ComponentAlpha 1 antitrypsin.MS

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 changed2.40

Consumer names

Alpha 1 Antitrypsin MS, Blood

Part names

Alpha 1 antitrypsin.MSMCncPtSer/PlasQnAlpha 1 antitrypsin MSMass 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.