It depends on what thermometer you are using. Do you have the original instructions that go with it? I know anal thermometers are most accurate for babies. I have a digital forehead thermometer for my daughter and it is always about 3 degrees less than what the doctor says it is. You could also look online for what type of thermometer you have.
Also, I know this won't help now, but take your child's temperature when he is NOT sick everyday for about a week or two. This will let you know what his "normal" temp is with your thermometer. My daughter's normal temp is 96 with the digi thermometer, so when she run 99 degrees, I take her to the doctor, because I know that is actually over 101.
at 4:45 AM on Jan. 27, 2010