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LOINC Code 21237-3: CMV IgM IF (CSF) [Titer]

21237-3 is a LOINC code used to identify CMV IgM 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 Cytomegalovirus Ab.IgM. 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 Cytomegalovirus Ab.IgM. 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

  • Cytomegalovirus IgM Ab [Titer] in Cerebral spinal fluid by Immunofluorescence
  • Cytomegalovirus Ab.IgM
  • ABS; Aby; ACIF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; Autoantibodies; Autoantibody; Cerebral spinal fluid; Cerebrospinal Fl; CMV; Cytomegalo virus; Cytomgal; Dilution factor; Dilution Factor (Titer); FA; Fluorescent antibody; Fluoresent; HHV-5; Human Herpesvirus-5; ID; IFA; Immune fluorescence; Immune globulin M; Immunoflour; Immunofluor; Immunofluorescence; Immunoglobulin M; Infectious Disease; InfectiousDisease; Microbiology; Neuro; Neurology; Point in time; Random; SmQn; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Time Resolved Fluorescence; Titer; Titered; Titre; 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

CMV IgM IF (CSF) [Titer]Cytomegalovirus IgM Ab [Titer] in Cerebral spinal fluid by ImmunofluorescenceCMV IgM Titr CSF IFCytomegalovirus Ab.IgMMICROCytomegalovirus (CMV) IgM antibody, Spinal fluidTitr

Frequently asked questions

Code details

Code21237-3
SystemLOINC
Display nameCMV IgM IF (CSF) [Titer]
DescriptionCytomegalovirus Ab.IgM
Short nameCMV IgM Titr CSF IF
ComponentCytomegalovirus Ab.IgM
PropertyTitr
TimingPt
System (specimen)CSF
ScaleSemiQn
MethodIF
ClassMICRO
Example unitstiter
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

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

Consumer names

Cytomegalovirus (CMV) IgM antibody, Spinal fluid

Part names

Cytomegalovirus Ab.IgMTitrPtCSFSemiQnIFCytomegalovirus IgMTiterPoint 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 21237-3 | HealthAssure