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        Beta-2-Microglobulin (B2M)

        Immunology

        Sample and container requirements

        Serum

        Minimum volume required

        1mL serum

        Special requirements

        None

        Patient preparation

        None

        Sample viability

        Turnaround time

        1 day

        Reference range

        Serum (Adult): 1.2 – 2.4 mg/L

        Clinical guidance

        β-2 microglobulin is a small lymphoid cell surface protein. It exists in the serum as a stable monomer with no significant diurnal variation. Measurement of β2-microglobulin indirectly reflects tumour mass, growth rate and renal function. Serum concentrations can be used as a useful prognostic marker in myeloma but is also raised in Sjogrens syndrome, HIV related disease and after organ transplantation. Concentrations are raised in renal tubular dysfunction irrespective of cause (e.g. heavy metal, cytotoxic drugs). Please refer to LabTestsOnlineUK for more information: https://labtestsonline.org.uk/tests/beta-2-microglobulin-tumour-marker

        Notes

        Images to go here

        This information was last updated on 19 August 2026