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.

LOINCBoth

LOINC Code 81724-7: Glomerular basement membrane Ab IB Ql (S)

Name: LOINC Code 81724-7: Glomerular basement membrane Ab IB Ql (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:05.776Z

81724-7 is a LOINC code used to identify Glomerular basement membrane Ab IB Ql (S) 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 Glomerular basement membrane Ab. It is commonly used with the system or sample type Ser.

Reviewed by HealthAssure Clinical TeamUpdated 21 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 Glomerular basement membrane Ab. It is commonly used with the system or sample type Ser.

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: DEPRECATED
Order vs observation: Both
Method: IB

What it does not mean

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

Key facts

Deprecated Glomerular basement membrane Ab [Presence] in Serum by Immunoblot
Glomerular basement membrane Ab
ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Basem; Basemt; Blt; BM; GBM; Glom; Goodpastures; Immune blot; Immunobl; Immunoblot; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; RIBA; Screen; Serology; Serum; SR; WB; WBLOT; West blot; West blt; Western blot

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

Glomerular basement membrane Ab IB Ql (S)Deprecated Glomerular basement membrane Ab [Presence] in Serum by ImmunoblotDeprecated GBM Ab Ser Ql IBGlomerular basement membrane AbSEROGlomerular basement membrane antibody, BloodPrThr

Frequently asked questions

Code details

Code81724-7

SystemLOINC

Display nameGlomerular basement membrane Ab IB Ql (S)

DescriptionGlomerular basement membrane Ab

Short nameDeprecated GBM Ab Ser Ql IB

ComponentGlomerular basement membrane Ab

PropertyPrThr

TimingPt

System (specimen)Ser

ScaleOrd

MethodIB

ClassSERO

StatusDEPRECATED

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.56

Last changed2.58

Consumer names

Glomerular basement membrane antibody, Blood

Part names

Glomerular basement membrane AbPrThrPtSerOrdIBPresence or ThresholdPoint in time (spot)SerumImmunoblot

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.