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Test Code Lab501 Toxoplasma gondii Antibody, IgG, Serum

Infectious

Additional Codes

LAB501

Methodology

Multiflex Flow Immunoassay, Bio-Rad Bioplex 2200
Literature References:

Package insert: Bio-Rad Bioplex 2200 System ToRC IgG IFU 04-2019
 

 

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Specimen Requirements

Specimen Type: Serum
Container/Tube: Plain red top, Red/Grey SST or Gold SST
Specimen Volume: Full tube

Missouri Baptist Medical Center Note:

Laboratory Handling Instructions:

Spin, separate, and refrigerate a minimum of 0.2 mL of serum overnight and on weekends.

Specimen Transport Temperature

Ambient

Reference Values

Reference Value

Toxoplasma, IgG - Negative

Literature References:

1. Package insert: Bio-Rad 2200 System ToRC IgG IFU  04-2019

2. Clinical Laboratory Standards Institute (CLSI). Clinical Use and Interpretation of Serologic Testing for Toxoplasma gondii, Approved guideline.  (M36-A), Feb 2004

Day(s) Test Set Up

Monday through Sunday, 0700-1300

Turnaround Time:
STAT: not available
Routine: results available the day of testing

Test Classification and CPT Coding

86777- Toxoplasma IgG

Additional Information

For BJH Laboratory Use Only

Analyte Stability:

Specimen stored at room temperature (8-30° C) for 3 days and store specimen at 2-8° C up to 7 days.  Freeze specimen, devoid of RBCs, at ≥-20° C for longer storage.  Do not store in a frost free freezer.  Specimens tested after 3 freeze/thaw cycles showed no qualitative differences.  Mix thoroughly after each thawing.

Avoid hemolysis.

Laboratory Processing Instructions:

Test performed in BJH Core Lab.  Centrifuge, separate serum, and refrigerate at 4° C for up to 7 days

LOINC Code Information

Name LOINC Code
Toxoplasma Antibody, IgG, Immune Status 5390-0

 

Interpretive Data

Negative - No detectable antibody.

Equivocal - Presence of detectable antibody cannot be determined.

Positive - Detectable levels of antibody present.

Note: Levels of IgG antibody to Toxoplasma gondii begin to rise 1 to 2 weeks after infection. Peak levels are reached in 6 to 8 weeks, then gradually decline over months to years. Low titers are generally detectable for life. The antibody titer does not correlate with severity of illness.