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Lab Test Dictionary

Xmn1 (screening for the polymorphism)

Performing Lab

UCSF Benioff Hemoglobinopathy Reference Lab, Oakland

Epic ID

Other Reference Test

Collection Information

Specimen Required

2 mL blood

Container Type

Lavender EDTA

Processing Information - Lab Use Only

Transport Temperature

Room Temp

Test Volume Required

2 mL blood

Minimum Test Volume

0.6 mL blood

Processing Instructions

Ok to send on Inpatients. Outpatients need insurance auth.


This assay detects a polymorphism associated with increase in fetal Hb, a beneficial finding in many patients will thalassemia or sickle-cell disease.

CPT Codes



cas 10/23/23