Make sure you receive a copy of the reports, so that YOU have the numbers. I once had 2 doctors tell me there was nothing wrong with my potassium levels, yet I was fainting! Another doctor, a friend who was with me during one such episode, called to find out my actual numbers and decided they were low enough to warrant my taking Vitamin K (potassium.) The fainting ended. I learned from that to always decide on my own, with the report numbers. We don't "all" fall within the norms for problem solving.