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 88517-8: M. tuberculosis stim IFN-g by CD4+ CD8+ T-cells corrected for background Qn (Bld)

Name: LOINC Code 88517-8: M. tuberculosis stim IFN-g by CD4+ CD8+ T-cells corrected for background Qn (Bld)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:16.698Z

88517-8 is a LOINC code used to identify M. tuberculosis stim IFN-g by CD4+ CD8+ T-cells corrected for background Qn (Bld) 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 Mycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells^^corrected for background. It is commonly used with the system or sample type Bld.

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 Mycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells^^corrected for background. It is commonly used with the system or sample type Bld.

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

What it does not mean

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

Key facts

Mycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells [Units/volume] corrected for background in Blood

Mycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells^^corrected for background

The quantitative levels (corrected for background) for an IFN-gamma response by CD4+ T-helper and CD8+ T cytotoxic lymphocytes stimulated by the presence of TB antigens, specifically ESAT-6 and CFP-10. This term was created for, but not limited in use to, the QuantiFERON-TB Gold Plus test, which includes two tubes with the Mycobacterium tuberculosis (MTB)-complex-associated antigens ESAT-6 and CFP-10 that stimulate a cell-mediated immunity (CMI) response. The first tube contains antigens that stimulate a response from CD4+ T-helper lymphocytes [LOINC64084-7], and the second tube (this term) contains the antigens included in tube 1 as well as an additional set of peptides targeting the CMI response from CD8+ cytotoxic T lymphocytes. In the QuantiFERON-TB Gold Plus test, the amount of IFN-gamma is measured by enzyme-linked immunosorbent assay and reported in IU/mL. Results are adjusted for background, heterophile antibody effects, or nonspecific IFN-gamma in blood samples.

Acid Fast; Acid Fast Bacilli; Acid fast bacillus; AFB; Arbitrary concentration; bckgrd cor; Blood; Cell; Cellularity; Helper T cells; ID; IFN; IGRA; Inducer T cells; Infectious Disease; InfectiousDisease; L3T4; Leu2; Leu-2; Leu3; Leu-3; Lung; M tb; M TB IFN-g; M TBIFN-g CD4+ CD8+T-cells; M tuberculosis; Microbiology; Mtb; Myco; Mycobact; Mycobacterium tuberculosum; Point in time; Pulmonary; Pulmonology; QNT; Quan; Quant; Quantitative; Random; Respiratory; Suppressor T cells; T prime; T4; T-4; T8; T-8; TB; Tsuppressor; Tuberculosis; W3/25; WB; Whole blood

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

M. tuberculosis stim IFN-g by CD4+ CD8+ T-cells corrected for background Qn (Bld)Mycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells [Units/volume] corrected for background in BloodM TB IFN-g CD4+CD8+ bckgrnd cor Bld-aCncMycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells^^corrected for backgroundMICROMycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells Corrected for Background, BloodACnc

Frequently asked questions

Code details

Code88517-8

SystemLOINC

Display nameM. tuberculosis stim IFN-g by CD4+ CD8+ T-cells corrected for background Qn (Bld)

DescriptionMycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells^^corrected for background

Short nameM TB IFN-g CD4+CD8+ bckgrnd cor Bld-aCnc

ComponentMycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells^^corrected for background

PropertyACnc

TimingPt

System (specimen)Bld

ScaleQn

ClassMICRO

Example unitsIU/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.64

Last changed2.73

Consumer names

Mycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells Corrected for Background, Blood

Part names

Mycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells^^corrected for backgroundACncPtBldQnArbitrary ConcentrationPoint in time (spot)Blood

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.