The Minnestoa Department of Health (MDH) does not recomment IgM testing for active Mumps infection.
Mumps PCR testing is recommended instead.
Aid in the diagnosis of acute mumps infection
Immediately following collection, mix sample by gently inverting 5 times
Gold serum separator (SST) tube
Ambient (preferred) - 14 days
Refrigerated - 14 days
Frozen - 14 days
Freeze/thaw cycles - stable x 4
Enzyme immunoassay (EIA)
Negative: < 0.80
Borderline: 0.80 - 1.20
Positive: > 1.20