Given 1 yr of chronic high temp (99.5 to 100), is a relative lymphocyte percentage near 50% consistent over 3 tests in 9 months a cause for concern?

It depends,,,: This really depends on whether or not you have an underlying condition. If not, you might just have had a viral infection or something like that when your blood was tested. However, if you think you have some condition that affects the blood, you might want to see you doctor for evaluation. More tests are likely needed so see your dr. For them and the results of those you had. Good luck.