Questions About Kidney Function

Creatinine, a breakdown product of muscle excreted by the kidney, is the best routine test of kidney function. As kidney function becomes impaired, creatinine levels rise. It’s important to note that young, muscular individuals may make more creatinine, while elderly adults may have less creatinine.

Glomerular Filtration Rate (GFR) is a measure of how well the kidney is filtering. GFR can be calculated using several formulas and by a 24-hour urine collection.

Second, how frequently should my kidney function be checked?

It depends: 1, if you don’t have high blood pressure and kidney function is normal: At least once per year. 2, if you have high blood pressure or kidney function isn’t normal: At least twice per year. 3, if you are approaching kidney more: More often, check with your doctor.

Third, am I progressing if my creatinine is stable?


You may still be progressing even if your creatinine and GFR are stable. The CRISP study has demonstrated continuous renal enlargement as an indicator for disease progression.