What Can Cause a False-Positive IgM Serologic Test

Question

What can cause a false-positive IgM serologic test?
A) The presence of IgG antibodies
B) The presence of rheumatoid factors
C) The presence of Rh factor
D) The presence of cytomegalovirus (CMV) antibodies

Accepted Answer

The presence of rheumatoid factors in a patient's blood can cause a false-positive IgM serologic test result. Rheumatoid factors are antibodies that can bind to and interfere with the IgM test assay, leading to inaccurate results.