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LOINC Code 88518-6: M. tuberculosis stim IFN-g by CD4+ CD8+ T-cells Qn (Bld)

88518-6 is a LOINC code used to identify M. tuberculosis stim IFN-g by CD4+ CD8+ T-cells 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. 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. 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] in Blood
Mycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells
The quantitative levels (uncorrected 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; 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 Qn (Bld)Mycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells [Units/volume] in BloodM TBIFN-g CD4+ CD8+T-cells Bld-aCncMycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cellsMICROMycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells, BloodACnc

Frequently asked questions

Code details

Code88518-6
SystemLOINC
Display nameM. tuberculosis stim IFN-g by CD4+ CD8+ T-cells Qn (Bld)
DescriptionMycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells
Short nameM TBIFN-g CD4+ CD8+T-cells Bld-aCnc
ComponentMycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cells
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 changed2.64

Consumer names

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

Part names

Mycobacterium tuberculosis stimulated gamma interferon release by CD4+ and CD8+ T-cellsACncPtBldQnArbitrary 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.