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Kidney & Bladder | Last Active: Apr 14 4:00pm | Replies (10)
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@pams2024 Welcome to Mayo Clinic Connect! You have read great responses to your question. One thing I would add in, is the actual lab processing your sample. While they are required to be maintained within certain tolerances, I often will see variances on my labwork. When I have bloodwork taken twice in one day at different locations, I can get different readings!! Even the time of day can affect your reading.
Hydration seems to play a major factor in our eGFR. I know it does for me.
Ginger
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@gingerw @pams2024. Kudos to all for great responses. I am told by my Mayo NP nephrologist that inflammation plays an important part with values for both creatinine eGFR and Cystatin C eGFR. Cystatin C can be a more useful tool for nephrologists when measured against creatinine eGFR. Since many patients take both lab tests, it is important to know that you can be at Stage 3 CKD with creatinine eGFR but at the same time be in low Stage 4 with Cystatin C. Nephrologists most always side with Cystatin C, but truly would like to see the 2 lab tests be close to the same values. As others have pointed out, it is the frequency and trend of lab results that are essential for kidney function evaluation. I am a little proactive, so my PCP has my labs done every 6 to 8 weeks.