I have a cold. This isn't really surprising, or unusual, or even worth mentioning, because I get sick all the time. I catch anything and everything that anyone anywhere has. I get sick every week or two.
The problem is, yesterday morning as I was just starting to feel congested and achy, I was sitting in a hospital waiting to have my blood drawn three separate times over a period of four hours. The needle pokes were unpleasant, and the hours of waiting were boring, but by noon the test was over and done with. I came home and wondered to myself how long it would take to get results from the test. Upon Googling, I read that the test results are unreliable if you are sick.
Now why didn't the nurses, upon hearing me sniff and sneeze, tell me this little fact?