I have chronic fatigue syndrome and have lots of CMP and CBC tests I am watching as well as vit d, b-12, thyroid, lipids and a few other things that have been done repeat times. I've had this condition for 15 years, but misplaced most of my earlier medical records, but have notes/memory of some of them. So now I have a few from 2012 and the rest from 2016-2017.
I also keep track of supplements. A new experiment is to see if Paul Stamets 7 medicinal mushrooms supplement will raise my white blood cells count which is in reference range but sub-optimal. I feel that it did in the past, but that was just an off-handed observation.