Kidney reports can feel confusing because several numbers are often shown together. Three of the most useful are serum creatinine, estimated glomerular filtration rate (eGFR), and urine albumin. Each tells a different part of the story.
What is creatinine?
Creatinine is a waste product produced by normal muscle activity. Healthy kidneys remove it from the blood. When kidney filtration falls, the creatinine level may rise. However, creatinine is affected by factors such as age, muscle mass, body size and hydration, so it should not be interpreted in isolation.
What does eGFR mean?
eGFR is an estimate of how much blood the kidneys filter. It is calculated from the creatinine result along with other patient information. A lower eGFR can suggest reduced kidney function, but the meaning depends on whether the result is persistent, how quickly it is changing, and whether there are other signs of kidney damage.
Why test urine for albumin?
Albumin is a protein normally kept in the bloodstream by healthy kidney filters. When those filters are damaged, albumin can leak into the urine. A urine albumin-to-creatinine ratio, often called UACR, helps quantify this leakage. Albumin in urine can be an early marker of kidney damage, including in people with diabetes or high blood pressure.
Why trends matter
A single report is only one point in time. Doctors often compare results across weeks, months or years. A stable eGFR and stable or falling urine albumin may be reassuring in a person being treated for CKD, while a persistent decline or increasing protein leakage may prompt further evaluation.
Do not adjust medicines from a report alone
Some medicines can change creatinine or potassium levels for expected reasons, while others may need adjustment when kidney function changes. Do not stop prescribed treatment based only on a laboratory value without discussing it with your clinician.
Trusted patient education sources
This guide is written in patient-friendly language using established kidney education principles from the U.S. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) and, for dialysis access, the National Kidney Foundation. It is not a substitute for personal medical advice.