High Bun Creatinine levels what does it mean?

I recently had labwork done. My blood creatinine level is 1.23, BUN 31.6. My primary Doc is saying no worries because I take blood pressure meds (Benicar) . What tests should I request? I am a senior with edema in my legs, extreme fatigue and joint pain.

Here is a fairly decent explanation from 2006. I do not know if it exactly answers you question or the expertise of the person providing the answer but it might give you a good place to start.