However, this GFR indicates that a person with stage 2 CKD has additional signs of kidney damage. A GFR in this range usually means that a person’s kidneys are working well. If a person has stage 2 CKD, their GFR is 60–89 ml/min per 1.73 m 2. Some signs of kidney damage in stage 1 CKD can include protein in a person’s urine or physical damage. This is normal kidney function but with evidence of kidney damage. Stage 1 CKD means that a person’s GFR is at least 90 milliliters per minute (ml/min) per 1.73 meters squared (m 2). Changes in blood creatinine levels can indicate that a person has a problem with their kidneys.Ī change in a person’s GFR allows a doctor to classify CKD into stages, as follows. ![]() When the kidneys are working correctly, they filter a relatively constant amount of creatinine from the blood. Creatinine is a waste product of creatine, which is an acid that helps supply energy to muscle cells. A person’s GFR can depend on their body size, sex, and age.Ī doctor can determine a person’s GFR by testing the levels of creatinine in their blood. The GFR shows how well a person’s kidney is filtering waste. ![]()
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