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Lab Manual for Moffitt-Long and Mount Zion

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Beta-2 Microglobulin, urine

Item Value
Approval req'd? No
Available Stat? No
Test code B2MU
Test group Beta-2-Microglobulin
Performed by Quest
Sendout? Yes
Method Fixed rate time nephelometry
Patient Preparation Patient should void bladder, then drink at least 500 mL of water. A urine sample should be collected within 1 hour.
Collection Instructions Deliver asap to laboratory as Beta-2-microglobulin in unstable in acidic urine.

Results may be inaccurate if the sample is > 2 hours old when received
Container type Urine cup
Amount to Collect 10-20 mL
Sample type Random urine
Preferred volume 1 mL urine
Min. Volume 0.5 mL urine
UCSF Rejection Criteria Delivered to lab > 30 min after collection
Processing notes Adjust urine to pH 6-8 with 1M NaOH. Freeze aliquot. Order Quest # 4150N
Units µg/g Creatinine (mcg/g Creatinine)
Normal range
Normal ≤ 132 µg/g creatinine
OSHA Industrial Reference range 300 µg/g creatinine
Synonyms Beta-microglobulin; Microglobulin, beta-2
Stability Room temperature 8 hours, refrigerated 1 week, frozen at -20C 2 months.
Turn around times Set up 6x per week. Turnaround 4-5 days
Additional information Beta-2-microglobulin is unstable in acid urine. Samples should be alkalinized by laboratory staff within 2 hours of collection to prevent inaccurately low results.
CPT coding 82232-90, 82570-90
LOINC code 13485-8
Last Updated 4/29/2013 10:45:53 AM
Entry Number 1137

If you have additional questions regarding this test, please call: 415-353-1667

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