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Test Code IGM Immunoglobulin M (IgM), Serum or Plasma

Additional Codes

Epic Test ID


Performing Laboratory

Bronson Laboratory Services-Chemistry

Specimen Required

Container Type:


Inpatient: Mint

STAT: Mint

Outpatient: Gold 

Acceptable: Red Top or Green Lithium Heparin.


Optimal Collection Volume: 

4.5 mL; Full Tube

Collection Instructions:

Gently invert sample 5-6 times after collection.

Processing Instructions: 

1. Allow serum sample to clot for 30 minutes.

2. Centrifuge specimen within 2 hours of collection.

3. Specimen tubes without a gel barrier should have the serum or plasma aliquoted to a false bottom container after centrifugation.

4. Keep serum/plasma refrigerated until testing can be performed.

Reference Values

Newborns: 6-25 mg/dL

1-6 months: 19-103 mg/dL

7-12 months: 32-132 mg/dL

1-3 years: 41-190 mg/dL

4-5 years: 41-186 mg/dL

6-8 years: 46-197 mg/dL

9-10 years: 49-230 mg/dL

Adults: 53-334 mg/dL




Specimen Transport Temperature


Specimen Stability

Serum*, Room Temperature - 2 months

Serum*, Refrigerated - 4 months

Serum*, Frozen - 6 months

*Note: Heparinized plasma in gel separator tubes is less stable than serum and is only suitable for add-on testing up to 2 days following sample collection.

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding