CD 57 tests accurate?

[Jen1]

How accurate are CD 57 tests? My two sons and I have incredibly low CD 57 from lab corp. My LLMD has seen so many low cd 57 counts that he is wondering if it is accurate. Of course, people go to him with lyme symptoms so its hard to say. He sees plenty of negative Igenex Western Blots, but not normal CD 57 tests.

[MichaelTampa]

I feel it has tracked my progress fairly well. I have always had failing scores though. I have run into some on other message boards with scores that went in the good range when they got better, though. I believe they are generally accurate. I have heard it is questionable for kids, particularly those younger than 13.