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.

LOINCObservation

LOINC Code 921-7: B variant NOS Ag Ql (RBC donor)

Name: LOINC Code 921-7: B variant NOS Ag Ql (RBC donor)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:21.443Z

921-7 is a LOINC code used to identify B variant NOS Ag Ql (RBC donor) 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 B variant NOS Ag. It is commonly used with the system or sample type RBC^Donor.

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 B variant NOS Ag. It is commonly used with the system or sample type RBC^Donor.

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: Observation

What it does not mean

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

Key facts

Deprecated B variant NOS Ag [Presence] on Red Blood Cells from Donor
B variant NOS Ag
Antigen; Antigens; B Var NOS; BLOOD BANK; Donr; Erythrocytes; Ordinal; Other; Point in time; PR; QL; Qual; Qualitative; Random; Red blood cells; Red blood corpusles; Screen

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

B variant NOS Ag Ql (RBC donor)Deprecated B variant NOS Ag [Presence] on Red Blood Cells from DonorDeprecated B Var NOS Ag RBC Donr QlB variant NOS AgBLDBKB Variant NOS antigen, Donor Red blood cellsPrThr

Frequently asked questions

Code details

Code921-7

SystemLOINC

Display nameB variant NOS Ag Ql (RBC donor)

DescriptionB variant NOS Ag

Short nameDeprecated B Var NOS Ag RBC Donr Ql

ComponentB variant NOS Ag

PropertyPrThr

TimingPt

System (specimen)RBC^Donor

ScaleOrd

ClassBLDBK

StatusDEPRECATED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.65

Consumer names

B Variant NOS antigen, Donor Red blood cells

Part names

B variant NOS AgPrThrPtRBC^DonorOrdPresence or ThresholdPoint in time (spot)Red Blood Cells^Donor

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.