LOINCActiveObservation

LOINC Code 25300-5: T. gondii IgG 1st specimen/2nd specimen (S) [Ratio]

25300-5 is a LOINC code used to identify T. gondii IgG 1st specimen/2nd specimen (S) [Ratio] 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^1st specimen/2nd specimen. It is commonly used with the system or sample type Ser.

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 Toxoplasma gondii Ab.IgG^1st specimen/2nd specimen. It is commonly used with the system or sample type Ser.

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: Observation

What it does not mean

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

Key facts

Toxoplasma gondii IgG Ab [Ratio] in Serum --1st specimen/2nd specimen
Toxoplasma gondii Ab.IgG^1st specimen/2nd specimen
12; ABS; Aby; Acute specimen; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Convalescent; First; ID; Immune globulin G; Immunoglobulin G; Infectious Disease; InfectiousDisease; Microbiology; Point in time; Post immunization; Pre immunization; QNT; Quan; Quant; Quantitative; Random; Ratios; Rto; Second; Serum; sp1; sp2; Spec; SR; 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 1st specimen/2nd specimen (S) [Ratio]Toxoplasma gondii IgG Ab [Ratio] in Serum --1st specimen/2nd specimenT gondii IgG 1:2 Ser-RtoToxoplasma gondii Ab.IgG^1st specimen/2nd specimenMICROToxoplasma gondii IgG antibody 1st specimen/2nd specimen, BloodRatio

Frequently asked questions

Code details

Code25300-5
SystemLOINC
Display nameT. gondii IgG 1st specimen/2nd specimen (S) [Ratio]
DescriptionToxoplasma gondii Ab.IgG^1st specimen/2nd specimen
Short nameT gondii IgG 1:2 Ser-Rto
ComponentToxoplasma gondii Ab.IgG^1st specimen/2nd specimen
PropertyRatio
TimingPt
System (specimen)Ser
ScaleQn
ClassMICRO
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.00
Last changed2.10

Consumer names

Toxoplasma gondii IgG antibody 1st specimen/2nd specimen, Blood

Part names

Toxoplasma gondii Ab.IgG^1st specimen/2nd specimenRatioPtSerQnPoint in time (spot)Serum

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.