Tudor Lodge Surgery

Look after your kidneys

If we have sent you a link to this page, your blood tests show that your kidneys are not working quite as well as they should. This is called chronic kidney disease (CKD), and for most people it is stage 3. Please do not worry: it is very common, especially as we get older, it usually causes no symptoms, and there is a lot you can do to protect your kidneys.

1 in 10adults in the UK has some degree of CKD
Mostpeople with stage 3 CKD stay stable and it does not get worse
Under 2%of people with CKD ever need dialysis
Reviewed November 2026Next review November 2027Follows NICE guideline NG203

What stage 3 means

Stage 3 CKD in plain English

3a

eGFR 45 to 59

Mild to moderately reduced kidney function. Your kidneys are still doing most of their job.

3b

eGFR 30 to 44

Moderately reduced kidney function. We will check your blood and urine more often and look closely at your medicines.

What happens next

  • We will check your blood (eGFR) and urine (ACR) regularly, usually once or twice a year
  • We will review your blood pressure and your medicines
  • We may offer you a statin, and sometimes a medicine to slow CKD down
  • Most people with stage 3 stay under the care of their GP and never need to see a kidney specialist

Symptoms

Most people with stage 3 feel completely well. Some notice tiredness, swollen ankles or hands, itchy skin, muscle cramps, or needing to pass urine more or less often. Let us know if you notice any of these.

How you can help yourself

Eight things that protect your kidneys

The same things cause both kidney disease and heart disease: high blood pressure, high cholesterol, diabetes and smoking. So everything that keeps your heart healthy also protects your kidneys and helps stop CKD getting worse.

  • Keep your blood pressure down

    This is the most important thing you can do. We will agree a target with you. Check your blood pressure
  • Take your medicines

    Keep taking them even when you feel well. Some blood pressure and diabetes tablets also protect your kidneys.
  • Control your diabetes

    If you have diabetes, keeping your blood sugar in range is one of the best ways to protect your kidneys.
  • Stop smoking

    Smoking makes CKD more likely to get worse, and faster. Get help to stop
  • Eat well, with less salt

    Aim for less than 6g of salt a day (about a teaspoon). Do not add salt to food and check labels on ready meals.
  • Move more

    Being active helps your blood pressure, weight and blood sugar. Start small: a short walk every day counts.
  • Keep to a healthy weight

    Losing even a little weight if you are overweight can lower your blood pressure and blood sugar. Support with weight
  • Keep alcohol low

    No more than 14 units a week, spread over 3 or more days, with some alcohol-free days.

Also: avoid anti-inflammatory painkillers such as ibuprofen, naproxen and diclofenac unless a doctor has said they are safe for you, as they can harm your kidneys. Paracetamol is usually a safer choice. Always tell your pharmacist you have CKD before buying medicines, herbal remedies or supplements.

Sick day rules

If you are ill and becoming dehydrated

Some medicines can harm your kidneys if you become dehydrated. If you are unwell, you may need to stop them for a short time and restart once you are better. These are called sick day rules.

When

Follow the sick day rules if you have

  • Vomiting or diarrhoea (more than once)
  • A fever, sweats or shaking
  • Anything that stops you eating or drinking normally
What

Pause these medicines

Only if you take them and only while you are unwell. Keep drinking fluids if you can.

The medicine groups are listed below.

Restart

When you are better

Restart your usual doses 24 to 48 hours after you are eating and drinking normally. Do not take extra to make up for missed doses.

If you are no better after 48 hours, contact us.

Medicines to pause when you are unwell

  • ACE inhibitorsNames ending in “-pril”, such as ramipril, lisinopril, perindopril
  • ARBsNames ending in “-sartan”, such as losartan, candesartan, irbesartan
  • Water tablets (diuretics)Such as furosemide, bendroflumethiazide, indapamide, spironolactone
  • Anti-inflammatory painkillersSuch as ibuprofen, naproxen, diclofenac
  • MetforminA diabetes medicine
  • SGLT2 inhibitorsNames ending in “-gliflozin”, such as dapagliflozin, empagliflozin
  • SulfonylureasDiabetes medicines such as gliclazide, glimepiride
  • GLP-1 medicinesSuch as semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro)
Do not stop any other medicines. If you use insulin, never stop it: follow the sick day advice from your diabetes team. If you are not sure which of your medicines this applies to, ask us or your pharmacist. You can also ask for a sick day rules card.

Your tests

Understand your kidney results

We check your kidneys with two simple tests, usually at least once a year. Together they tell us your CKD stage and how closely we need to keep an eye on things.

eGFR

A blood test: how well your kidneys clean your blood

eGFR stands for estimated glomerular filtration rate. In plain English, it is an estimate of how much blood your kidneys clean every minute. It is worked out from a waste product in your blood called creatinine, along with your age and sex.

You can think of it roughly as a percentage of normal kidney function: an eGFR of 50 means your kidneys are working at about half the rate of healthy young kidneys. A higher number is better. Over 90 is normal, and it naturally falls a little as we get older.

ACR

A urine test: whether protein is leaking out

ACR stands for albumin to creatinine ratio. Healthy kidneys work like a fine sieve: they let waste out into your urine but keep useful things, such as a protein called albumin, in your blood. When kidneys are damaged, some albumin leaks through into your urine.

The ACR test measures how much albumin is in your urine. A lower number is better. Under 3 is normal. Please bring an early morning urine sample if we ask for one, as it gives the most accurate result.

Check where your results sit

Enter your latest results (you can find them in the NHS App), or tap a square on the chart.

ml/min/1.73m²
mg/mmol
eGFRA1ACR under 3A23 to 30A3over 30

Your result

–

Enter your eGFR, or tap a square on the chart, to see what it means.

CKD is only diagnosed when results stay abnormal for more than 3 months. One low result can be caused by dehydration, illness or a big meat meal the day before. This tool is a guide only. Please talk to us about your own results.

Kidneys and your heart

Protecting your kidneys protects your heart

The same things cause both: high blood pressure, high cholesterol, diabetes and smoking. CKD also increases your risk of heart attack and stroke. That is why we may offer you a statin to lower your cholesterol, even if your cholesterol level is normal. Medicines such as SGLT2 inhibitors (for example dapagliflozin) can also help slow CKD and protect your heart.

When to get help

Symptoms to tell us about

Contact us today
  • You are passing much less urine than usual, or none
  • You have been vomiting or had diarrhoea and cannot keep fluids down
  • You are still unwell 48 hours after starting the sick day rules
  • When we are closed, call NHS 111
Book an appointment
  • New swelling in your ankles, feet, legs or hands
  • Blood in your urine, or urine that looks very foamy
  • Feeling very tired, itchy, sick or breathless for no clear reason
  • Your home blood pressure average is above your target

For chest pain, or signs of a stroke such as a drooping face, arm weakness or slurred speech, call 999.

Support and more information

You are not on your own

Kidney Care UK support line0808 801 00 00Free advice and emotional support
Kidney Research UK helpline0300 303 1100Information about kidney disease

Based on NICE guideline NG203, NICE Clinical Knowledge Summaries, NHS sick day guidance, Kidney Care UK and Kidney Research UK. General information for our patients; it does not replace advice about your own care.

Did you know?

Alcohol affects this too

Alcohol can raise blood pressure, add hidden calories, upset blood sugar and strain your liver and kidneys. That pint could have as many calories as a cheeseburger!

Alcohol: know your numbers