My dd recently began seeing a naturopathic dr. in hopes of finding something to help with her fatigue. He wanted to do a few blood test that her primary doctors had not done. One of which was a marker for Lyme called CD57. It tests the level of a lymphocyte killer cell called CD57. Her result was low, supposedly meaning her CD57 lymphocyte has been suppressed and she could be positive for Lyme. (I would have provided more details but my brain just went into brain fog mode). Primarily, I am wondering if anyone else has had this test or if anyone knows its helpfulness in determining if Chronic Lyme could be a trigger or contributing to her chronic fatigue. Secondarily, I am wondering if there are other diseases or syndromes associated with having a low CD57 result.