how long after does mono is active
A negative test means there were no heterophile antibodies detected. Most of the time this means you do not have infectious mononucleosis. Sometimes, the test may be negative because it was done too soon (within 1 to 2 weeks) after the illness started. Your health care provider may repeat the test to make sure you do not have mono. A small number of people with mononucleosis may never have a positive test.