Protecting your kidneys: the annual uACR and eGFR check

The kidneys filter your entire blood volume many times a day through millions of microscopic units, and years of high glucose slowly stiffen and scar them. The process has no early symptoms: no pain, no change you would notice, often for a decade. By the time swelling, deep fatigue, or foamy urine appear, a lot of filtering capacity may already be gone. That silence is the whole reason screening exists. Caught early, kidney changes can be slowed and sometimes stabilized, and the treatments work best precisely when nothing yet feels wrong. It is one of the clearest cases in diabetes care where a cheap annual test changes the story.

The first test is a urine sample: the albumin-to-creatinine ratio, or uACR. Albumin is a protein that healthy kidneys keep in the blood; when tiny amounts start leaking into urine, that leak is often the earliest measurable sign of kidney stress. Dividing by creatinine corrects for how dilute the sample happens to be, so a single small sample works and no collection jug is involved. A result under 30 mg/g is typical. Higher results are usually repeated before anyone concludes anything, because exercise, fever, and infections can all bump the number temporarily without meaning the kidneys are in trouble.

The second is a blood test you have probably already had: eGFR, the estimated glomerular filtration rate, calculated from blood creatinine along with age and sex. It estimates how much filtering the kidneys are doing; 90 and above is typical, and values below 60 that persist for months are what clinicians investigate further. The two tests answer different questions, leak and capacity, which is why diabetes guidelines ask for both at least once a year for type 2 diabetes and after five years of type 1 diabetes. With prediabetes or high blood pressure, ask whether your individual risk calls for the same screening. Neither test requires fasting.

Between annual checks, the levers that protect kidneys are the ones you are already watching: glucose in range, blood pressure controlled, and not smoking. Some diabetes medicines have shown direct kidney protection in trials, which is a worthwhile question if your uACR is creeping up. In SteadyRange, the lab scan picks uACR and eGFR off a lab report and keeps them dated, and visit prep tracks when your last check happened, so whether the annual kidney screen is due becomes a question the app can answer before the appointment does. This is general information: interpreting a kidney result belongs to the clinician who knows your history.