Copyright © 2006 Massachusetts Medical Society. A 71-year-old man with type 2 diabetes and hypertension is referred for coronary angiography. His medications include metformin and a thiazide. Before the angiogram, his serum creatinine level is 1.8 mg per deciliter (160 μmol per liter), yielding an estimated glomerular filtration rate of 40 ml per minute per 1.73 m2 of body-surface area. What ca...
