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Beaumont Laboratory

Trypanosoma cruzi, IgM

Chagas Disease, ARUP #51075, EPIC: LAB6345, SOFT: XTCRM


Acute and convalescent specimens must be labeled as such; parallel testing is preferred and convalescent specimens must be received within 30 days of the acute specimens. Please mark specimen plainly as "acute" or "convalescent."

Specimen Collection Criteria

Collect (preferred specimen): One Gold-top SST tube.
Also acceptable: One plain Red-top tube.

Physician Office/Drawsite Specimen Preparation

Let specimen clot 30-60 minutes then centrifuge to separate serum from cells within two hours of collection. Transfer serum to a plastic transport tube and refrigerate (2-8°C or 36-46°F).

Preparation for Courier Transport

Transport: 1.0 mL serum, refrigerated (2-8°C or 36-46°F). (Min: 0.05 mL)

Rejection Criteria

  • Hemolyzed specimens.
  • Iceteric specimens.
  • Lipemic specimens.
  • Turbid specimens.
  • Specimens not collected and processed as indicated.


Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 48 hours
Refrigerated (2-8°C or 36-46°F): 14 days
Frozen (-20°C/-4°F or below): 1 year

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Sendout Laboratory with any questions.


Sent to ARUP Laboratories, Salt Lake City, UT.


Results available in 2-9 days.

Reference Range

Less than 1:16: Negative - No significant level of Trypanosoma cruzi IgM antibody detected.
1:16 or Greater: Positive - IgM antibodies to Trypanosoma cruzi detected, which may suggest current or recent infection. 

Test Methodology

Semi-Quantitative Indirect Fluorescent Assay.

CPT Code


Test Codes


Last Updated


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This directory currently reflects information only for specimens collected and/or processed at the Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.