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 6771-0: Alpha 1 antitrypsin Nephelometry [Mass/Vol]

Name: LOINC Code 6771-0: Alpha 1 antitrypsin Nephelometry [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

6771-0 is a LOINC code used to identify Alpha 1 antitrypsin Nephelometry [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. 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. 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
Method: Nephelometry

What it does not mean

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

Key facts

Alpha 1 antitrypsin [Mass/volume] in Serum or Plasma by Nephelometry
Alpha 1 antitrypsin
A1; A1A; A1AT; A-1-AT; A1-AT; AAT; Alfa; Alpha-1-antitrypsin.total; Alpha-1-protease inhibitor; Alpha-1-proteinase inhibitor; Alpha-1-trypsin inhibitor; Chemistry; Hepatology; i; Level; Light scattering; Liver; Lung; Mass Concentration; Nephelom; Pl; Plasma; Plsm; Point in time; 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 Alpha 1 antitrypsin Nephelometry [Mass/Vol] (6771-0)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Alpha 1 antitrypsin Nephelometry [Mass/Vol]Alpha 1 antitrypsin [Mass/volume] in Serum or Plasma by NephelometryA1AT SerPl Neph-mCncAlpha 1 antitrypsinCHEMAlpha 1 antitrypsin, BloodMCnc

Frequently asked questions

Code details

Code6771-0

SystemLOINC

Display nameAlpha 1 antitrypsin Nephelometry [Mass/Vol]

DescriptionAlpha 1 antitrypsin

Short nameA1AT SerPl Neph-mCnc

ComponentAlpha 1 antitrypsin

PropertyMCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

MethodNephelometry

ClassCHEM

Example unitsg/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0h(2)

Last changed2.73

Consumer names

Alpha 1 antitrypsin, Blood

Part names

Alpha 1 antitrypsinMCncPtSer/PlasQnNephelometryMass 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.