#ExistRefRange>0.89 IV or less: Negative - No significant level of detectable Parvovirus B19 IgM antibody.
0.90-1.10 IV: Equivocal - Repeat testing in 10-14 days may be helpful.
1.11 IV or greater: Positive - IgM antibody to Parvovirus B19 detected, which may indicate a current or recent infection. However, low levels of IgM antibodies may occasionally persist for more than 12 months post-infection.
#ExistInterpData>The best evidence for current infection is a significant change on two appropriately timed specimens, where both tests are done in the same laboratory at the same time.
Appearance of an IgM antibody response normally occurs 7 to 14 days after the onset of disease. Testing immediately post-exposure is of no value without a later convalescent specimen. A residual IgM response may be distinguished from early IgM response to infection by testing sera from patients three to four weeks later for changing levels of specific IgM antibodies.
||B19 (Parvovirus B 19 Antibody, IgM), Fifth Disease (Parvovirus B 19 Antibody, IgM)