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 97991-4: HHV 6 IgG IF Qn (S)

Name: LOINC Code 97991-4: HHV 6 IgG IF Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:31.427Z

97991-4 is a LOINC code used to identify HHV 6 IgG IF Qn (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 Herpes virus 6 Ab.IgG. 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 Herpes virus 6 Ab.IgG. 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: ACTIVE
Order vs observation: Both
Method: IF

What it does not mean

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

Key facts

Herpes virus 6 IgG Ab [Units/volume] in Serum by Immunofluorescence
Herpes virus 6 Ab.IgG
ABS; Aby; ACIF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; Arbitrary concentration; Autoantibodies; Autoantibody; FA; Fluorescent antibody; Fluoresent; Herpesvirus; HHV; HHV6; HHV-6; Human herpes virus; Human herpes virus type 6; ID; IFA; Immune fluorescence; Immune globulin G; Immunoflour; Immunofluor; Immunofluorescence; Immunoglobulin G; Infectious Disease; InfectiousDisease; Microbiology; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; SR; Time Resolved Fluorescence; TRF

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

HHV 6 IgG IF Qn (S)Herpes virus 6 IgG Ab [Units/volume] in Serum by ImmunofluorescenceHHV6 IgG Ser IF-aCncHerpes virus 6 Ab.IgGMICROHerpes virus (HHV) 6 IgG antibody, BloodACnc

Frequently asked questions

Code details

Code97991-4

SystemLOINC

Display nameHHV 6 IgG IF Qn (S)

DescriptionHerpes virus 6 Ab.IgG

Short nameHHV6 IgG Ser IF-aCnc

ComponentHerpes virus 6 Ab.IgG

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

MethodIF

ClassMICRO

Example units{index_val}

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.70

Last changed2.70

Consumer names

Herpes virus (HHV) 6 IgG antibody, Blood

Part names

Herpes virus 6 Ab.IgGACncPtSerQnIFHerpes virus 6 IgGArbitrary ConcentrationPoint in time (spot)SerumImmunofluorescence (IF)

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.