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LOINC Code 23974-9: B. quintana IgG IF (CSF) [Titer]

23974-9 is a LOINC code used to identify B. quintana IgG IF (CSF) [Titer] 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 Bartonella quintana Ab.IgG. It is commonly used with the system or sample type CSF.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Bartonella quintana Ab.IgG. It is commonly used with the system or sample type CSF.

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

  • Bartonella quintana IgG Ab [Titer] in Cerebral spinal fluid by Immunofluorescence
  • Bartonella quintana Ab.IgG
  • ABS; Aby; ACIF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; Autoantibodies; Autoantibody; B quintana; Cat Scratch Disease; Cat Scratch Fever; Cerebral spinal fluid; Cerebrospinal Fl; CSD; Dilution factor; Dilution Factor (Titer); FA; Fluorescent antibody; Fluoresent; ID; IFA; Immune fluorescence; Immune globulin G; Immunoflour; Immunofluor; Immunofluorescence; Immunoglobulin G; Infectious Disease; InfectiousDisease; Microbiology; Neuro; Neurology; Point in time; R quintana; Random; Rochalimae quintana; Rochalimaea quintana; SmQn; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Time Resolved Fluorescence; Titer; Titered; Titre; Trench fever; TRF; Ttr

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

B. quintana IgG IF (CSF) [Titer]Bartonella quintana IgG Ab [Titer] in Cerebral spinal fluid by ImmunofluorescenceB quintana IgG Titr CSF IFBartonella quintana Ab.IgGMICROBartonella quintana IgG antibody, Spinal fluidTitr

Frequently asked questions

Code details

Code23974-9
SystemLOINC
Display nameB. quintana IgG IF (CSF) [Titer]
DescriptionBartonella quintana Ab.IgG
Short nameB quintana IgG Titr CSF IF
ComponentBartonella quintana Ab.IgG
PropertyTitr
TimingPt
System (specimen)CSF
ScaleSemiQn
MethodIF
ClassMICRO
Example unitstiter
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0o
Last changed2.75

Consumer names

Bartonella quintana IgG antibody, Spinal fluid

Part names

Bartonella quintana Ab.IgGTitrPtCSFSemiQnIFBartonella quintana IgGTiterPoint in time (spot)Cerebral spinal fluidImmunofluorescence (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.

LOINC Code 23974-9 | HealthAssure