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A 29-year-old female asked:

Could having a flu or cold when your blood is drawn cause a false positive on a hepatitis a igm test? igg was negative.

3 doctor answers3 doctors weighed in
Dr. Richard Zimon
Internal Medicine 59 years experience
Probably not related: The positive HEP A igm indicated that you HAD HEPATITIS A remotely...(usually as a CHILD since JAUNDICE does not occur with HEP A in childhood.) Hope this helps! Dr Z
Dr. Richard Zimon
Internal Medicine 59 years experience
Provided original answer
Agree with Dr Abbot...I "mis-wrote ( Substitute Igg for igm)
Jan 14, 2015
Dr. Martin Raff
Infectious Disease 56 years experience
False positive: This is very unlikely. If you have antibodies to Hep A they are likely to be very specific for that virus.
Dr. Julie Abbott
Preventive Medicine 45 years experience
Very possibly: As you know, the hepatitis A IgM antibody tests for recent infection. False positives may result due to the presence of cross-reactive antibodies from other viral infection or underlying illnesses. Depending on the circumstances and time of exposure, retesting should be considered. Best wishes:)

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Last updated Jan 14, 2015

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