I’m not a doctor but I vaguely recall that this radioimmunoassay technique is used in the detection of blood clots.
I think it’s considered the gold standard for measuring problems in the blood stream. I don’t know the exact process, but I believe that this method proves beyond a shadow of a doubt whether or not you have a blood condition.
Years ago I went to the emergency room for chest pain. They put me through a battery of tests, like treadmill, blood panel, etc. They did everything except this last technique. The doctor had already decided that my condition was normal and thought that I had simply suffered from heartburn or something like that.
Anyway, I’ve been fine ever since, but I had a friend tell me that the tests they put me through are only 50% accurate. He mentioned this last technique, but the doctors didn’t think I needed it.