how long does it take to diagnose mono
If heterophil antibodies are present, the blood clumps (agglutinates). This result usually indicates a mono infection. Monospot testing can usually detect antibodies 2 to 9 weeks after a person is infected. It typically is not used to diagnose mono that started more than 6 months earlier. EBV antibody test. For this test, a sample of blood is mixed with a substance that attaches to antibodies against EBV.