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  • Test Details
  • Lab Values
  • Clinical Significance
  • Treatment Options
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Explore this test

Test Code 641

Test Details

IgM (SARS-CoV-2 [COVID-19])

SARS-CoV-2 IgM antibody levels are useful for evaluating recent virus exposure.

Methodology

Chemiluminescent Immunoassay

Patient Preparation

None

Preferred Specimen

1.0 mL serum collected in a serum separator tube (SST / Tiger Top)

Alternate Specimen

N/A

Transport Temperature

Refrigerated (ship on frozen cold packs)

Stability

Refrigerated: 7 days

Lab Values

Lab Values

IgM (SARS-CoV-2 [COVID-19])

  • Values ≥1.00 AU/mL are considered positive.
Test Details
Clinical Significance

Clinical Significance

IgM (SARS-CoV-2 [COVID-19])

A positive antibody test indicates prior exposure. Serum IgM indicates recent infection, and is typically positive within 3 to 10 days of symptom onset, while serum IgG antibodies (Spike or Neutralizing Antibodies) are often present within 1-2 weeks from symptom onset and can remain positive for several months.
 

  • A positive PCR test for SARS-CoV-2 indicates active infection.
  • A negative PCR with a positive IgM indicates recent infection.
  • A negative PCR with negative IgM and positive Spike or Neutralizing antibody indicates past infection, or vaccination and presumed immunity.
  • This assay has no cross reactivity with antibodies for other coronavirus strains or other respiratory viruses.
  • The sensitivity and specificity of our COVID-19 antibody tests are >95%, with CVs of <4%.
Lab Values
Treatment Options

Treatment Options

IgM (SARS-CoV-2 [COVID-19])

Symptomatic SARS-CoV-2 (COVID-19) infections usually resolve without treatment, and vaccination is recommended for prevention. Severe cases may require hospitalization and/or medical treatment.

Clinical Significance