Included with every panel
Baseline labs come free with any panel you build.
Metabolism & organs
eGFR test
Estimated glomerular filtration rate. Estimated glomerular filtration rate from creatinine, the standard measure of how well your kidneys filter blood. Included with every panel.
At a glance
In about 5 days
Most results are ready in about 5 days. Some specialty markers can take up to 21 days.
Check before your draw
This marker has no preparation tag, but it can still need preparation. Contact us before your draw if you’re not sure.
Walk in at Quest
Your lab order arrives by email. Most Quest locations take walk-ins, so bring it with a photo ID.
What it measures
Your eGFR is an estimate of how well your kidneys filter waste out of your blood. This one is worked out from creatinine, a waste product of your muscles, along with your age and sex.
Why it matters for women
The formula adjusts for sex, so your result reflects typical differences between women’s and men’s bodies. It isn’t designed for pregnancy, when your kidneys naturally filter much more, so results then are read with extra care. Long-term kidney disease is slightly more common in women and often causes no symptoms early on.
You might check it if…
- you live with high blood pressure or diabetes
- kidney disease runs in your family
- you often take anti-inflammatory pain relievers
- a past test showed protein in your urine
What your result may mean
High eGFR: what it may mean
A higher eGFR may mean better kidney filtration, and a value in the normal range may point to healthy kidney function. Low muscle mass can lower creatinine and lift this estimate, so it may overstate how well the kidneys work in some women. The formula isn't designed for pregnancy, when your kidneys can naturally filter much more. A normal eGFR can't rule out early kidney disease on its own, so a clinician may add a urine albumin test, especially with diabetes or high blood pressure.
Low eGFR: what it may mean
A low eGFR may point to reduced kidney function, and values that stay low over time can define chronic kidney disease (CKD). Diabetes and high blood pressure can be major reasons, and long-term kidney disease can be slightly more common in women. Dehydration, high muscle mass and some medicines can also make this estimate read low. Many people may have no symptoms early on, while swelling or tiredness can appear later. A clinician may repeat the test before reading much into one result.
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These notes provide context and do not diagnose a condition. Not yet available in NY, NJ, RI, HI, ND, SD or WV.