eGFR 90: Normal Kidney Function — The Healthy Threshold
An eGFR of 90 mL/min/1.73m² indicates normal kidney function. This is the threshold above which kidneys are considered healthy. Your kidneys are filtering blood efficiently.
Quick Answer
- ✓Classification: Normal kidney function (eGFR 90+ is healthy)
- ✓What it means: Kidneys filtering blood effectively
- ✓Action needed: None specific — maintain healthy habits
- !Exception: If protein in urine present, may be Stage 1 CKD despite eGFR 90
Where eGFR 90 Falls
The National Kidney Foundation considers eGFR 90 or above as normal kidney function. You're at this threshold — your kidneys are working as they should.
Note: Even with eGFR 90+, presence of protein in urine (albuminuria) or other kidney damage signs technically classifies as Stage 1 CKD. Always check if your doctor tested for proteinuria as well.
What eGFR 90 Tells You
eGFR (estimated Glomerular Filtration Rate) measures how much blood your kidneys filter per minute. At eGFR 90:
- Your kidneys filter approximately 90 mL of blood per minute (per standardized body surface area)
- Waste products are being efficiently cleared from your bloodstream
- Your kidney reserves are adequate for normal function
According to NIH guidelines, an eGFR of 90 is considered normal for an adult of any age, though younger adults typically have eGFR of 110-120.
How to Maintain Healthy Kidney Function
Your kidneys are working well. Keep them that way with these evidence-based practices from the National Kidney Foundation:
1Stay hydrated
Adequate water intake helps kidneys clear waste. There's no magic number — let thirst guide you, and aim for pale yellow urine. Don't overhydrate; that's not better.
2Control blood pressure
Hypertension is a leading cause of kidney damage. Keep blood pressure below 130/80 mmHg. If elevated, treat it early.
3Manage blood sugar
Diabetes is the other leading cause of CKD. If you have diabetes or prediabetes, tight control protects your kidneys long-term.
4Avoid unnecessary NSAIDs
Regular use of ibuprofen, naproxen, and similar drugs can harm kidneys over time. Use them sparingly and avoid combining with other nephrotoxic agents.
5Annual monitoring
Include creatinine/eGFR and urine protein (albumin/creatinine ratio) in your annual labs. Catching any decline early enables early intervention.
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