I have labs drawn at least once a month, sometimes more often. I am still treated for the effects of my blood cancer (an immune system booster). So between my nephrologist and onc I have them on a regular basis. Also, if you ever want to see your blood work without a doctor visit you should check out this link. https://www.walkinlab.com/. These are the same labs the doctors use. I usually get the metabolic panel for about $28. Regarding changing lab values, about the only thing I focus on is creatinine and BUN. If I stray off the reservation with my diet, the labs nudge me back into the program. My lymphoma from several years ago and the treatment caused a big hit to my immune system, so I also watch my IgG level. When it drops below range I am treated with an infusion of IVIG which boosts my IgG levels back to keep me from catching everything that moves. Other than that, so far there has not been any significant changes. I do keep copies of all my lab reports and read them like a hawk to be sure I'm still alive :-).