Glomerular Filtration Rate in Kidney Disease
The new classification of kidney disease is based
on GFR, a measure that is accepted as the best overall measure
of kidney function. Stages 2 and 3 carry the caveat that elderly
people may have reduced GFRs that are age related and not related
to chronic kidney disease. GFRs are calculated based on a creatinine
level measured in a spot urine specimen that takes into account
factors such as patient's age, gender, race, and body size.
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(mL/min per 1.73 m2) |
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Kidney disease with normal GFR |
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Mildly impaired GFR |
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Moderately impaired GFR |
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Severely impaired GFR |
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Kidney failure |
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| MEN | WOMEN | |
| Normal | <17 mg/dL | <25 mg/dL |
| Microalbuminuria | 17-255 mg/dL | 25-355 mg/dL |
| Proteinuria | >255 mg/dL | >355 mg/dL |
About 10 million Americans have stage 1 kidney disease, nearly 22 million have stage 2 disease, nearly 6 million have stage 3, 360,000 have stage 4, and 300,000 have stage 5.
