What is the normal range for blood urea nitrogen and creatinine?

Blood urea nitrogen, or BUN, normally ranges from 10 to 20 milligrams per deciliter. Creatinine normally ranges from 0.7 to 1.3 milligrams per deciliter for men and 0.6 to 1.1 for women. Both are markers of kidney function. Elevated levels indicate decreased renal perfusion or kidney damage. BUN can also rise from dehydration, high protein diet, gastrointestinal bleeding, or corticosteroid use. Creatinine is a more specific indicator of kidney function because it is less affected by non-renal factors.