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LOINC Code 31685-1: T. gondii IgG Ql (CSF)

31685-1 is a LOINC code used to identify T. gondii IgG Ql (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 Toxoplasma gondii 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 Toxoplasma gondii 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

What it does not mean

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

Key facts

  • Toxoplasma gondii IgG Ab [Presence] in Cerebral spinal fluid
  • Toxoplasma gondii Ab.IgG
  • ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Cerebral spinal fluid; Cerebrospinal Fl; ID; Immune globulin G; Immunoglobulin G; Infectious Disease; InfectiousDisease; Microbiology; Neuro; Neurology; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; T gondii; Toxo; Toxoplasmosis

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

T. gondii IgG Ql (CSF)Toxoplasma gondii IgG Ab [Presence] in Cerebral spinal fluidT gondii IgG CSF QlToxoplasma gondii Ab.IgGMICROToxoplasma gondii IgG antibody, Spinal fluidPrThr

Frequently asked questions

Code details

Code31685-1
SystemLOINC
Display nameT. gondii IgG Ql (CSF)
DescriptionToxoplasma gondii Ab.IgG
Short nameT gondii IgG CSF Ql
ComponentToxoplasma gondii Ab.IgG
PropertyPrThr
TimingPt
System (specimen)CSF
ScaleOrd
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.07
Last changed2.56

Consumer names

Toxoplasma gondii IgG antibody, Spinal fluid

Part names

Toxoplasma gondii Ab.IgGPrThrPtCSFOrdToxoplasma gondii IgGPresence or ThresholdPoint 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 31685-1 | HealthAssure