If you’ve got chronic kidney disease, you’ve probably noticed that nobody can tell by looking at you how your kidneys are doing. You can feel fine and still be sliding, or feel rough and be perfectly stable. So the only real way to know is through tests, repeated over time.
This guide covers the ones that matter, what a “worse” result looks like, and how to make sense of your own numbers without driving yourself up the wall.
First, a quick idea that makes everything easier
Kidney disease isn’t judged from one result. It’s judged from a trend. KDIGO, the international group behind the main CKD guideline, defines CKD as kidney damage or reduced function that lasts for more than three months. Both eGFR and urine albumin wobble a bit from test to test for no meaningful reason. A single odd reading, good or bad, doesn’t tell you much.
So when you read on, keep one thing in mind: you’re looking for a direction, not a snapshot. If you’re newer to this, the way CKD stages are defined and managed gives helpful background on what the labels mean.
The core tests
Here’s the short list of what doctors usually rely on.
| Test | What it shows | What “getting worse” can look like |
| eGFR (blood) | How well your kidneys are filtering | Numbers drifting down across several tests |
| UACR (urine) | How much albumin is leaking out | Numbers climbing into a higher band |
| Potassium, bicarbonate | Whether blood chemistry is staying balanced | Potassium creeping up, bicarbonate dropping |
| Haemoglobin | Whether anaemia is developing | Falling levels, more tiredness |
| Calcium, phosphate, PTH | How bones and minerals are coping | Abnormal results as kidney function drops |
| Blood pressure | Strain on kidneys and heart | Readings harder to control |
| Ultrasound | Kidney size and structure | Shrunken or scarred kidneys |
Not everyone needs every test at every visit. Early on, it’s mostly eGFR, UACR and blood pressure. The chemistry, anaemia and bone checks usually join in as function falls.
eGFR: your filtering score
eGFR is calculated from a blood marker, usually creatinine, plus your age and sex. It’s the main number for how much your kidneys are doing. If you want the background on the marker itself, what a high creatinine result means explains why creatinine alone can mislead.
Here’s a useful detail. Creatinine comes from muscle, so people with very high or very low muscle mass can get a skewed answer. When there’s doubt, KDIGO suggests adding cystatin C, a second blood marker, to improve accuracy. If your doctor mentions a cystatin C test, that’s usually why.
How much of a change counts? KDIGO’s guidance says changes in eGFR bigger than about 20 percent are likely to reflect real change in kidney function rather than random noise. A sustained fall of more than about 5 mL/min per year is generally treated as fast progression and tends to prompt a closer look.
UACR: the leak detector
UACR measures albumin in the urine, and it often changes before eGFR does. That’s what makes it so useful. Someone’s eGFR can look steady for years while their urine protein quietly creeps up, which is an early hint that the filters are under strain. The full story on what those numbers mean for your risk is in whether protein in urine means you will need dialysis.
Again, KDIGO gives a handle on noise. Urine albumin drops of more than 50 percent or rises of more than 100 percent are probably more than random swings. A rise that big, repeated, deserves a conversation.
| What changed | Is it probably real? |
| eGFR changes by more than 20% | Likely yes |
| eGFR changes by a few points | Possibly just noise |
| UACR rises by more than 100% | Probably yes |
| UACR falls by more than 50% | Probably yes (good news) |
| One slightly odd reading | Repeat it before reacting |
The supporting tests
These don’t tell you the filtering rate, but they tell you how your body is coping, and they often explain how you’re feeling.
Potassium and bicarbonate. Kidneys help keep these balanced. High potassium and low bicarbonate can show up as kidney function falls, and both are worth catching early.
Haemoglobin. Kidneys help make the hormone that tells your body to produce red blood cells. When that slips, anaemia and fatigue follow.
Calcium, phosphate and PTH. These track bone and mineral health, which often goes off track in later stages.
Blood sugar, such as HbA1c. Particularly important if you’re dealing with type 2 diabetes and its effect on the kidneys, because uncontrolled sugar drives a lot of kidney decline.
Blood pressure at home and in the clinic. Both a cause and a consequence of kidney trouble, so tracking it matters.
Cholesterol and heart risk. People with CKD face higher cardiovascular risk, so KDIGO also recommends estimating heart risk with a validated tool.
Don’t ignore how you feel
Tests are the main tool, but symptoms count too. Tiredness that’s getting worse, swelling in the ankles, a poor appetite, itching, more trips to the toilet at night, or shortness of breath can all signal change. They’re also vague, so they never replace a lab result. They’re just a reason to speak up earlier.
How often should you be tested?
This one has no single answer. How often depends on your stage, your albumin level and your cause. As a loose guide, someone stable and early-stage may be checked about once or twice a year, while someone in later stages may be checked every few months. KDIGO suggests reassessing risk factors every three to six months for people with CKD, but your own doctor sets the real schedule.
Some things should bring a check forward: a new medication that can affect the kidneys, a bad bout of dehydration or illness, a sudden change in swelling or urination, or a result that looks very different from your usual pattern.
Keep your own record
This is the single most useful thing a patient can do. Write down each eGFR and UACR with the date, plus your blood pressure and any medicine changes. A phone note or simple spreadsheet is enough. When you can see the line moving, your questions get sharper, and you’ll spot a result that doesn’t fit your pattern. It also helps if you ever change clinics, whether you’re followed at a government clinic or a private hospital in Malaysia.
Where the numbers lead
When tests do show decline, the next step is rarely dialysis. It’s usually tightening up the basics and finding the cause. Depending on where you are, these may help: whether stage 3 always leads to dialysis, what an eGFR of 15 to 29 means for dialysis planning, and when dialysis becomes necessary. And if you’re asking whether things can bounce back, whether kidney function can improve separates temporary drops from lasting damage.
A word on regenerative options
Some people start asking about cell-based options when their numbers dip. It’s a fair question, and the honest answer is that research is still early. No treatment can promise to stop decline or avoid dialysis. If you want to read up, start with stem cells and kidney disease and how a clinic explains its clinical evidence and safety. Any serious conversation begins with your test history, not a promise.
Frequently Asked Questions
Which test is best for tracking kidney disease?
No single test does it all. eGFR shows filtering and UACR shows leakage, and doctors read them together alongside blood pressure and other results.
How do I know if my kidney function is dropping?
Look for a steady downward trend in eGFR over several tests, or a rise in UACR. One odd reading isn’t enough on its own.
What counts as a significant change?
KDIGO notes that an eGFR change above about 20 percent is likely real. For urine albumin, a rise above 100 percent or a fall above 50 percent is probably beyond normal variation.
Is a cystatin C test necessary?
Not for everyone. It’s often added when creatinine may be unreliable, for example with unusual muscle mass, or when your doctor wants a more accurate estimate.
Can I do any of these tests at home?
Blood pressure, yes. Blood and urine tests for eGFR and UACR need a lab, though some urine dipsticks exist for screening. Don’t rely on them to replace proper testing.
Can symptoms alone tell me my kidneys are getting worse?
No. Many people feel fine until function is quite low. That’s why regular testing matters more than waiting for symptoms.
How often should I get tested if my kidneys are stable?
It varies, but stable early-stage disease is often checked once or twice a year. Higher risk or lower function means more frequent checks. Your doctor will set the rhythm.
When should I see a kidney specialist?
When eGFR is falling quickly, UACR is high or rising, the cause is unclear, or your blood pressure is hard to control.
Want help making sense of your results?
If you’ve got a stack of lab reports and aren’t sure what they add up to, gather them in date order and speak with the 23C Regen team about your kidney results. Patients coming from overseas can check the page for international patients, and you can look at pricing beforehand.
This article is general information, not medical advice or a substitute for ordering tests through your own doctor. Consult with our team for proper assessment.