Hi Nurse Terri,
So I’ve sorted out that the swab culture is a different test from the IgM.
I was reading my medical records wrong and now understand that the IgM was one of the blood tests taken. sorry.
I read that if the swab sample is taken from the sore more than 48 hours after the sore appears then there is a higher chance for a false negative. My sample was taken 4-5 days after the sore appeared. In your experience has that been common? the false negative from a sore more than a couple of days old?