I have mild high blood pressure and take a new med called losartin 50 mgs. What could cause the creatine to be elevated then?

Good medicine. Losartan is in a class of medications called arbs (for angiotensin receptor blocker) and although they may increase creatinine some, they protect the kidneys, particularly from hbp and diabetes. However, when creatinine rises too much, it will have to be stopped. The one to define how much is too much is your physician. Be sure to ask him/her.