Apr 18, 2017




Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Chemistry


IgM (XGAM3) Chemistry Lab Test

Name: IgM

Test Name: IgM

Health Link Test Code: XGAM3

LIS Test Code: IGM

CPT Code(s): 82784

Included In: IGAM

Methodology: Immunoturbidimetry

Clinical Information:

Measurement of IgM aids in the diagnosis of immunoglobulin disorders, multiple myeloma, macroglobulinemia and hypergammaglobulinemic states.

Days Performed: Daily, 24 hours.

In-Lab Turnaround Time: 4 hours.

Stat In-Lab Turnaround Time: 1 hour.

Specimen: Blood

Collection Container: Red cap with yellow ring (SST)

Also Acceptable: Red top

Collection Instructions:

If there is the possibility that the patient has a cryoprotein, specimen MUST BE KEPT WARM UNTIL AFTER TESTING IS COMPLETE. Indicate specimen is to be drawn warm.

Collection Volume: 3 mL

Pediatric Collection Volume: 1 mL

Stability Ambient:

2 months

Stability Refridgerated:

4 months

Stability Frozen:

6 months

Sample Analyzed: Serum

Testing Volume: 1 mL

Pediatric Testing Volume: 0.3 mL

Specimen Processing:

Centrifuge within 2 hours of draw. Transfer cell-free serum to plastic vial. Refrigerate. Freeze serum if not assayed within 72 hours.


IMPORTANT: IF THE PATIENT HAS A CRYOPROTEIN, keep blood specimen at 37°C during entire processing procedure. Place collection tube in the 37°C incubator for two hours. Spin tube at 3000 rpm for 10 minutes at 37°C. Remove spun serum to labeled tube and forward to UWHC Chemistry Lab.

Specimen Transport:

Transport specimen to Laboratory. Transport with coolant pack if coming from clinic location. Transport frozen serum aliquot on dry ice to Laboratory.


Important: For samples on patients suspected of having a cryoprotein, specimen MUST be processed prior to transport if coming from clinic location. Transport specimens with coolant pack after processing is complete.

Unacceptable Criteria:

Grossly hemolyzed specimens are not acceptable.


Age: Male (mg/dL) Female (mg/dL)
0 days-2 months 6-21 6-21
3 months-1 year 17-143 17-150
1-11 years 41-183 47-240
12 years and up 22-240 33-293

Interpretation Type: Reference Interval