Test Directory

Immunoglobulin, IgM

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Updated Test Information:

Test Description
Immunoglobulin, IgM
Synonym(s)
IgM Immunoglobulin
Test ID
IGM
General Information
IgM is the first specific antibody to appear in the serum after infection. It is capable of activating complement, thus helping to kill bacteria. After the infection has subsided, IgM levels sink at a relatively rapid rate compared to IgG. This fact is used in the differential diagnosis of acute and chronic infections by comparing specific IgM and IgG titers. If IgM is prevalent the infection is acute, whereas if IgG predominates the infection is chronic
Specimen Type
Serum
Alternate Specimen Type
Red, Li-heparin plasma, K2EDTA
Specimen Requirements
SST
Specimen Collection / Processing Instructions
SST - Separate serum or plasma from cells within 45 minutes of collection. If a red-top tube or green-top tube is used, transfer separated serum or plasma to a plastic transport tube.
Additional Processing Details
Separate serum or plasma from cells within 45 minutes of collection. If a red-top tube or green-top tube is used, transfer separated serum or plasma to a plastic transport tube.
Stability
2 months at 15‑25 °C
4 months at 2‑8 °C
6 months at (-15)‑(-25) °C
Limitations
This test may not provide accurate results in patients with monoclonal gammopathy, due to individual sample characteristics which can be assessed by electrophoresis.
Methodology
Immunoturbidimetric
Estimated TAT
0-2 days
Testing Schedule
Monday-Saturday
CPT Code(s)
82784
Minimum Sample Volume
1 mL
Pediatric Min. Volume (if applicable)
500 uL
Reference Range
0-<1 year 0-145 mg/dL
1-<4 years 19-146 mg/dL
4-<7 years 24-210 mg/dL
7-<10 years 31-208 mg/dL
10-<12 years 31-179 mg/dL
12-<14 years 35-239 mg/dL
14-<16 years 15-188 mg/dL
16-<19 years 23-259 mg/dL
Adults 40-230 mg/dL

 

Performing Lab
Incyte Diagnostics
LOINC Code(s)
2472-9