Longterm, I appreciate the response. I am a little in shock over this and it doesn't prove conclusively one way or the other, which is the most worrying thing. I would rather know straight but the test is written in such a way not to fully contextualise the results. The lab is not responding to my request for further information; I suppose they feel they have met their part of the contract and it's for me to find out more using other means. It does feel pretty horrible.
If you are going to check your results make sure it is CD57- NK Cells.