Pathology Handbook

β2-Microglobulin

Synonyms

B2M

Clinical Indications

High cell turnover in myeloma results in raised serum concentrations of b2-microglobulin (b2M) and renal dysfunction will result in serum retention contributing to higher levels. b2M is the single most important prognostic indicator in the management of myelomatosis and reflects tumour mass, growth rate and renal function. It is particularly useful as a tumour marker in Bence-Jones myeloma where a serum paraprotein is absent.

Request Form

Request on ICE

Availability

Analysed on request if specific criteria met and request is appropriate

Specific Criteria

Monitoring and management of myeloma.  Usually requested by Consultant Haematologists.

Turnaround Time

1 week

Specimen

Serum in gold-top vacutainer

Volume

2 ml

Container

Vacutainer gold top

Causes for Rejection

Unlabelled or incorrectly labelled sample; not meeting specific criteria for analysis

Reference Range

Adult reference range: <2.4 mg/L

Levels below 4.0 mg/L at presentation reflect best prognosis, whereas levels above 20.0 mg/L reflect worst prognosis.