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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Beta 2-microglobulin

Test Code(s): B2M / XB2MS

CPT Code(s): 82232

Methodology: Nephelometry

Request Form: UWHC Laboratory Request Form (UWH 1289220, 4004202); Write in test if not on form.

Days Performed: Daily, 24 hours.

Turnaround Time: Stat: 1 hour.
Routine: 4 hours.


Specimen Requirements

Specimen: Blood

Collection Container: Preferred: Green cap with yellow ring (PST)
Also Acceptable: Green top, Red cap with yellow ring (SST), Red top

Collection Volume: Preferred: 1 mL
Pediatrics: 1 mL

Sample Analyzed: Plasma or serum

Volume Required: Preferred: 0.5 mL
Pediatrics: 0.3 mL

Specimen Processing: Centrifuge.  If a complete barrier has not formed, transfer cell-free plasma/serum to plastic vial.  Refrigerate.

Specimen Transport: Transport specimen to UWHC Core Laboratory (B4/220). Transport with coolant pack if coming from outreach location.

Stability: Refrigerated: 8 days at 2-8C
Frozen: 6 months at -20C


Interpretation

Reference Interval:
 Male  mg/L
   0 day - 30 days  1.6 - 5.1
   1 month - 6 months  1.4 - 3.6
   7 months - 11 months  0.9 - 3.4
   12 months - 3 years  0.7 - 2.6

   4 years - 6 years

 0.6 - 2.6
   7 years - 17 years  0.7 - 2.3
   18 years and up  1.3 - 2.8
   
 Female  
   0 day - 30 days  1.7 - 4.8
   1 month - 6 months  1.0 - 4.1
   7 months - 11 months  1.0 - 2.6
   12 months - 3 years  0.7 - 2.6
   4 years - 6 years  0.6 - 2.6
   7 years - 17 years  0.7 - 2.3
   18 years and up  1.3 - 2.8

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