编辑部医生:我今年72岁,患糖尿病、高血压有约15年了。我的这两种病控制得相当好,但最近我了解到,我的肾功能在下降。我的肌酐水平现在是2.2毫克/分升(mg/dL)。这种情况的严重程度有多大?读者:方先生 Editorial Department Doctor: I am 72 years old and have diabetes and hypertension for about 15 years. Both of my diseases are well controlled, but recently I learned that my kidney function is declining. My creatinine level is now 2.2 mg / dL (mg / dL). How serious is the situation? Reader: Mr. Fang