eGFR Explained: Understanding Your Kidney Test
If you’ve ever gotten a blood report that mentions eGFR, you probably wondered what the number really means. In plain terms, eGFR estimates how well your kidneys are filtering waste from your blood. Knowing this number helps you catch problems early and take action before they get serious.
How eGFR is Calculated
The lab takes your serum creatinine level, plugs it into a formula that also uses your age, sex, and race, then spits out an eGFR value in mL/min/1.73 m². Creatinine is a waste product that muscles produce all the time, so higher levels suggest the kidneys aren’t clearing it fast enough. The result is an estimate—not a perfect measurement—but it’s good enough to guide most doctors.
What Your eGFR Numbers Mean
Typical eGFR numbers range from 90 to 120 for healthy adults. Anything above 90 is considered normal, and your kidneys are likely doing their job well. When the number drops below 60, it signals reduced kidney function. A reading under 30 means the kidneys are struggling a lot and need close monitoring.
Several things can push the eGFR down temporarily. Dehydration, certain medications, and a high‑protein meal can raise creatinine, which in turn lowers eGFR. Chronic conditions like diabetes or high blood pressure are the usual culprits for a persistently low value.
If your eGFR is unusually high—above 130—it might indicate hyperfiltration, a state where the kidneys work overtime. This can happen in early diabetes or with high protein intake and may precede kidney damage if left unchecked.
So, what can you do to keep your eGFR in the healthy zone? Start with hydration: drink enough water throughout the day, especially if you exercise or live in a hot climate. Manage blood sugar if you have diabetes and keep blood pressure under control with diet, exercise, or medication as prescribed.
Limit foods that strain the kidneys, like excessive salt and processed meats. A balanced diet rich in fruits, vegetables, and whole grains supports overall kidney health. If you take painkillers such as ibuprofen regularly, talk to your doctor about safer alternatives.
Regular check‑ups matter. If your eGFR is below 60, ask your doctor for a repeat test in a few months and consider a referral to a kidney specialist. Early intervention can slow disease progression and improve quality of life.
Bottom line: eGFR is a quick snapshot of kidney performance. Understanding the number, spotting trends, and making simple lifestyle tweaks can keep your kidneys working smoothly for years to come.
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- Health
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