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LOINC Code 31303-1: C. pneumoniae IgM Qn (CSF)

31303-1 is a LOINC code used to identify C. pneumoniae IgM Qn (CSF) 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 Chlamydophila pneumoniae 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 Chlamydophila pneumoniae 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

What it does not mean

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

Key facts

  • Chlamydophila pneumoniae IgM Ab [Units/volume] in Cerebral spinal fluid
  • Chlamydophila pneumoniae Ab.IgM
  • ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; C pneum; C pneumo; C pneumoniae; Cerebral spinal fluid; Cerebrospinal Fl; Chlamydia; Chlamydia pneumoniae; CPN; ID; Immune globulin M; Immunoglobulin M; Infectious Disease; InfectiousDisease; Microbiology; Neuro; Neurology; Pneu; pneum; Pneumo; Pneumon; Pneumonia; Point in time; QNT; Quan; Quant; Quantitative; Random; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Twar agent

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

C. pneumoniae IgM Qn (CSF)Chlamydophila pneumoniae IgM Ab [Units/volume] in Cerebral spinal fluidC pneum IgM CSF-aCncChlamydophila pneumoniae Ab.IgMMICROChlamydophila pneumoniae IgM antibody, Spinal fluidACnc

Frequently asked questions

Code details

Code31303-1
SystemLOINC
Display nameC. pneumoniae IgM Qn (CSF)
DescriptionChlamydophila pneumoniae Ab.IgM
Short nameC pneum IgM CSF-aCnc
ComponentChlamydophila pneumoniae Ab.IgM
PropertyACnc
TimingPt
System (specimen)CSF
ScaleQn
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.07
Last changed2.69

Consumer names

Chlamydophila pneumoniae IgM antibody, Spinal fluid

Part names

Chlamydophila pneumoniae Ab.IgMACncPtCSFQnChlamydophila pneumoniae IgMArbitrary ConcentrationPoint in time (spot)Cerebral spinal fluid

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 31303-1 | HealthAssure