<s>[INST] have been told I have a low HC something?? of 40-42 in kidney function. but my primary care says I am fine but when for a MRI and they could only give me 1/2 dose of contress because of that level. said they could kill me or damage my kidneys if the gave me the full dose. So what is it? How do I get better or is it a real problem? [/INST] Well information is not clear Just provide values of BUN and S.CREATININEMost likely that value is of bun ,blood urea nitrogen  If it is high then for sure contrast has to be given in low dose /avoided It may harm kidneySend your complete KFT reports and then review after report </s>