Patient information
Chronic kidney disease: looking after your kidneys
This leaflet explains what chronic kidney disease (CKD) is, what your test results mean, and what you can do to protect your kidneys and your heart.
Your results
Name:
Kidney function (eGFR): mL/min Urine protein (ACR): mg/mmol
CKD stage:
Blood pressure goal:
Kidney blood tests: at least
What is chronic kidney disease?
Your kidneys filter waste and extra water out of your blood to make urine. They also help control blood pressure and keep your bones and blood healthy. Chronic kidney disease means the kidneys have not been working as well as they should for more than 3 months.
CKD is common, especially as people get older, and is often linked to high blood pressure and diabetes. For most people it is mild and does not get much worse. Only a small number ever need dialysis or a transplant. However, CKD does raise your risk of heart attack and stroke, which is why looking after your heart is a big part of treatment.
What do my results mean?
- eGFR is a blood test that estimates how well your kidneys filter. A normal level is 90 or more, and the number tends to fall gradually with age. Below 60 for more than 3 months counts as CKD.
- ACR is a urine test that measures protein (albumin) leaking into your urine. A level of 3 or more is raised. Higher levels mean a greater risk that kidney function will fall, and of heart problems.
- Your stage combines both, for example G3aA2. G is for eGFR, from G1 to G5, and A is for albumin, from A1 to A3.
CKD usually causes no symptoms, so regular tests are the best way to keep track.
What can I do to protect my kidneys?
1. Keep your blood pressure under control
This is the most important thing you can do. Take your blood pressure medicines every day and have your blood pressure checked regularly. Your goal is shown above.
2. Look after your diabetes
If you have diabetes, keeping your blood sugar in your target range protects your kidneys, eyes and nerves.
3. Eat well and cut down on salt
- Aim for less than 6g of salt a day. Avoid adding salt and check food labels.
- Eat plenty of fruit, vegetables and wholegrains, and keep to a healthy weight.
- You do not need a low-protein diet. If your kidney function is very reduced, you may be asked to limit potassium or phosphate, and a dietitian will advise you.
- Do not use "low-salt" substitutes that contain potassium unless your clinician says they are safe for you.
4. Be active, stop smoking and drink sensibly
Aim for 150 minutes of moderate activity a week. Stopping smoking protects your kidneys, heart and blood vessels. Keep alcohol to no more than 14 units a week.
Your medicines
- Blood pressure tablets called ACE inhibitors (names ending in "-pril") or ARBs (names ending in "-sartan") protect the kidneys, especially if you have protein in your urine. You will need a blood test 1 to 2 weeks after starting or changing the dose.
- SGLT2 inhibitors (dapagliflozin or empagliflozin; names ending in "-gliflozin") slow kidney damage and protect the heart, whether or not you have diabetes.
- A statin (usually atorvastatin) is recommended for most people with CKD to lower the risk of heart attack and stroke.
- Avoid anti-inflammatory painkillers such as ibuprofen and naproxen unless a doctor has said they are safe for you. Paracetamol is usually fine.
- Always tell pharmacists and other clinicians that you have CKD, including before buying medicines or herbal remedies.
Sick day rules
If you become unwell with vomiting, diarrhoea or a fever with sweats and shaking, and cannot eat or drink normally, some medicines can harm your kidneys. Ask your GP or pharmacist which of yours to pause. These commonly include ACE inhibitors and ARBs, water tablets (diuretics), metformin, SGLT2 inhibitors and anti-inflammatory painkillers.
Restart them once you are eating and drinking normally, usually after 24 to 48 hours. If you are not getting better after 48 hours, contact your GP practice.
Check-ups
You will have regular blood and urine tests, a blood pressure check and a review of your medicines. How often depends on your stage. A few people are referred to a kidney specialist, for example if tests show the kidneys are getting worse quickly.
When to get help
Contact your GP practice the same day, or call 111, if you pass much less urine than usual, have new swelling of your legs or face, become more breathless, or see blood in your urine.
Call 999 if you have chest pain, severe breathlessness, or signs of a stroke.
Where to find more help
- NHS – chronic kidney disease: nhs.uk/conditions/kidney-disease
- Kidney Care UK: kidneycareuk.org
- Kidney Research UK: kidneyresearchuk.org
- Think Kidneys – sick day guidance: thinkkidneys.nhs.uk
- NHS Better Health (activity, weight, alcohol, smoking): nhs.uk/better-health
Based on NICE guideline NG203, Chronic kidney disease: assessment and management, and NHS advice. This leaflet is general information and does not replace advice from your own healthcare team.