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 21006-2: HBV surface Ab IA Qn (S donor)

Name: LOINC Code 21006-2: HBV surface Ab IA Qn (S donor)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:29.457Z

21006-2 is a LOINC code used to identify HBV surface Ab IA Qn (S 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 Hepatitis B virus surface Ab. It is commonly used with the system or sample type Ser^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 Hepatitis B virus surface Ab. It is commonly used with the system or sample type Ser^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: ACTIVE
Order vs observation: Both
Method: IA

What it does not mean

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

Key facts

Hepatitis B virus surface Ab [Units/volume] in Serum from Donor by Immunoassay
Hepatitis B virus surface Ab
ABS; Aby; Antby; Anti; Antibodies; Antibody; anti-HBsAg; Arbitrary concentration; Autoantibodies; Autoantibody; Donr; EIA; ELFA; ELISA; Enzyme immunoassay; HBs; HBsAB; HBV; HBV surface; Hep; Hep B; Hep Bs; Hepatis; Hepatit; HepB; IAA; ID; Infectious Disease; InfectiousDisease; MEIA; Microbiology; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; SR; SUDS; Surf

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

HBV surface Ab IA Qn (S donor)Hepatitis B virus surface Ab [Units/volume] in Serum from Donor by ImmunoassayHBV surface Ab Ser Donr IA-aCncHepatitis B virus surface AbMICROHepatitis B virus (HBV) Surface antibody, Donor BloodACnc

Frequently asked questions

Code details

Code21006-2

SystemLOINC

Display nameHBV surface Ab IA Qn (S donor)

DescriptionHepatitis B virus surface Ab

Short nameHBV surface Ab Ser Donr IA-aCnc

ComponentHepatitis B virus surface Ab

PropertyACnc

TimingPt

System (specimen)Ser^Donor

ScaleQn

MethodIA

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.73

Consumer names

Hepatitis B virus (HBV) Surface antibody, Donor Blood

Part names

Hepatitis B virus surface AbACncPtSer^DonorQnIAArbitrary ConcentrationPoint in time (spot)Immunoassay

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.