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 75708-8: Bruton tyrosine kinase FC Nar (B cells+monocytes) [Interp]

Name: LOINC Code 75708-8: Bruton tyrosine kinase FC Nar (B cells+monocytes) [Interp]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:56.382Z

75708-8 is a LOINC code used to identify Bruton tyrosine kinase FC Nar (B cells+monocytes) [Interp] 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 Bruton tyrosine kinase. It is commonly used with the system or sample type B cells+monocytes.

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 Bruton tyrosine kinase. It is commonly used with the system or sample type B cells+monocytes.

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: Flow cytometry

What it does not mean

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

Key facts

Bruton tyrosine kinase [Interpretation] in B cells+monocytes by Flow cytometry (FC) Narrative

Bruton tyrosine kinase

Analysis of the Bruton tyrosine kinase (Btk) protein by flow cytometry is performed as a preliminary screen for X-linked agammaglobulinemia (XLA), primarily in male patients (<65 years of age) or female carriers (child-bearing age<45 years). Since genotype-phenotype correlations are important, BTK gene sequencing [LOINC: 35295-5] is performed when the Btk protein is absent by flow cytometry to confirm the diagnosis of XLA.

Bruton's Tyrosine Kinase; Btk; CELL MARKERS; Dynamic; FC; Impression; Impression/interpretation of study; Impressions; Interp; Interpretation; Narrative; Point in time; Random; Report; Tyr; Tyrosine-protein kinase BTK; XLA; X-Linked Agammaglobulinemia

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

Bruton tyrosine kinase FC Nar (B cells+monocytes) [Interp]Bruton tyrosine kinase [Interpretation] in B cells+monocytes by Flow cytometry (FC) NarrativeBtk B cells+mono FC-ImpBruton tyrosine kinaseCELLMARKInterpretation of Bruton tyrosine kinase test result, B Cells+monocytesImp

Frequently asked questions

Code details

Code75708-8

SystemLOINC

Display nameBruton tyrosine kinase FC Nar (B cells+monocytes) [Interp]

DescriptionBruton tyrosine kinase

Short nameBtk B cells+mono FC-Imp

ComponentBruton tyrosine kinase

PropertyImp

TimingPt

System (specimen)B cells+monocytes

ScaleNar

MethodFlow cytometry

ClassCELLMARK

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.50

Last changed2.50

Consumer names

Interpretation of Bruton tyrosine kinase test result, B Cells+monocytes

Part names

Bruton tyrosine kinaseImpPtB cells+monocytesNarFlow cytometryImpression/interpretation of studyPoint in time (spot)Flow cytometry (FC)

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.