t cell

in all cases of lymphoma are the t-cell counts high

[bluestarmom187]

I found this when I googled "t-cell count lymphoma"
Blood work
This is probably the first test that they will do. The problem though is that you cannot diagnose lymphoma by a blood test. All you can do is review the results and see if "something" appears to be wrong. Lymphoma circulates within the lymph system and not the blood system so detecting lymphoma by a simple blood test is extremely unlikely. What they can detect however is abnormal blood counts which simply gives them a clue to look for a cause.  Since lymphoma is a cancer of the lymphocytes (a type of white blood cell) you might think that a high lymphocyte count would be a strong indicator of lymphoma, but it is not. A high lymphocyte count in the blood is more likely to indicate an infection or maybe even leukaemia which is a cousin to lymphoma because it is also a cancer of the white blood cells. The difference is that in leukaemia the cancerous blood cells are found primarily in the blood and marrow, whereas lymphoma is found primarily in the lymph and marrow.  
Hope that this helps a little.