For last 3 years, my LDH level has been around 190, picked up during routine annual blood testing for work. The range from my lab says anything <251 is normal but some lab ranges on the NHS says top range is 214. Should I be worried that's mine is always at the higher end of normal. Obviously I'm worried about things like lymphoma as it's of often used as a marker of the disease. I have no other health conditions such as anemia or hypothyroid, I'm petite, I don't exercise much and not on any medication. Has anyone had levels like this not related to disease? Thank you for reading