Kidney and urine checks
Two small annual tests that catch the earliest strain on your kidneys long before anything could be felt, and why a single raised result is usually repeated.
The kidney checks are two small tests, usually once a year, that between them catch the earliest signs of strain long before anything could be felt. Like eye screening, they exist because the early stage is completely silent, and unlike most things in diabetes they take almost no effort from you.
- A urine sample looking for small amounts of protein, and a blood test checking how well the kidneys are filtering.
- Both are part of the routine annual checks everyone with diabetes should be offered.
- Early changes cause no symptoms, which is the entire reason for testing rather than waiting.
- An abnormal result is not a verdict: it is often reversible or treatable, particularly when found early.
- Blood pressure is checked alongside them, because it matters to kidneys as much as glucose does.
- Glucose in both directions is part of the same picture: years of running higher is what strains the filters, while frequent lows matter to your team too, since a hypo (a low below 4 mmol/L where you feel shaky, sweaty or confused and need fast sugar) can come on at the time or shortly after something, and again hours later including overnight.
What each one is looking for
The urine test looks for small amounts of protein leaking through where it should not. Healthy kidneys keep protein in the blood; when the tiny filters come under strain, a little starts appearing in urine, and it does so long before anything else changes. It is usually a single sample, often first thing in the morning, and there is nothing to it beyond remembering to bring it.
The blood test estimates how well your kidneys are filtering overall. Between them, the two answer different questions: one detects early leakage, the other measures overall function, and it is entirely possible for one to change while the other stays normal. That is why both are done rather than either alone.
Blood pressure gets checked at the same time and belongs in the same conversation. High blood pressure damages kidneys independently of glucose, and it is one of the more treatable factors, so it is not an afterthought bolted onto the appointment.
Because the early stage is silent and the late stage is not
Kidney changes in diabetes develop slowly and produce nothing you could notice for a long time. No pain, no change to how often you go, nothing in how you feel. By the time symptoms appear, considerably more has happened than anyone would want, which is the argument for testing on a schedule rather than when something seems wrong.
The reason it is worth taking seriously is that the early stage genuinely responds. Changes found at the small-amounts-of-protein stage can often be slowed, stabilised or reversed, with treatments that are well established and not dramatic. That window is what the annual test exists to find, and it is not a wide one.
Which is also why a result you have not understood is worth asking about rather than filing. Plenty of people are told a result was slightly raised and never find out whether that meant anything, and the answer is usually specific and reassuring or specific and actionable, rather than vague.
What an abnormal result does and does not mean
A single raised protein result does not mean kidney disease. It can be affected by a urine infection, by having exercised heavily beforehand, by illness or by being very high at the time, so an abnormal result is usually repeated before anything is concluded. If yours came back raised, the next step is normally another test rather than a diagnosis.
If a genuine pattern is found, the response is generally practical rather than alarming: attention to blood pressure, sometimes a specific medication that protects kidneys, a look at glucose over the longer term, and closer monitoring. None of that is a last resort, and the reason it works is that it started early.
What is fair to ask is what your own numbers were, whether they have changed since last year, and what would count as a change worth acting on. A trend across years is far more informative than a single figure, and it is the sort of thing that goes unmentioned unless someone asks.
What affects kidney risk
Blood pressure is the factor people underestimate most, and it is often the most treatable one in the list. Duration matters because this accumulates slowly. And it is worth mentioning any medication you take, including things bought over the counter such as regular anti-inflammatory painkillers, because some affect kidneys and your team may not know you are taking them.
How the checks work in practice
Examples, not instructions or doses.
You arrive for the annual review without a urine sample because nobody said to expect one. Easily solved on the day usually, and easier still if the letter had said so.
A raised protein result, then a normal one a few weeks later. A urine infection or a hard gym session can produce the first, which is why one result is rarely acted on alone.
Numbers within normal range each year, but drifting in one direction across four. That trend is the useful information, and it only appears if someone looks across years.