ENKIKnowledge libraryCKD basics
What is CKD?
Chronic kidney disease, usually shortened to CKD, means there has been a change in kidney structure or function that matters to health and has lasted for at least three months. It describes a wide range of kidney problems, from early changes with normal filtration to kidney failure.
This guide helps you understand terms and prepare questions. It cannot diagnose a condition or tell you to change treatment. Seek local medical care for urgent or severe symptoms.
Start here
Three points to keep
- CKD is defined by persistent kidney abnormalities, not by one unusual test result.
- Blood eGFR and urine albumin are usually interpreted together.
- Early CKD often causes no symptoms, so planned testing matters.
What the kidneys do
The kidneys remove waste and extra water from the blood. They also help balance minerals, support red blood cell production, regulate acid balance, and take part in blood pressure and bone health.
CKD does not mean the kidneys have stopped working. It means a persistent change has been found that may affect health now or increase future risk.
How CKD is identified
Clinicians look for reduced filtration or other markers of kidney damage that persist for at least three months. A single result may reflect dehydration, infection, medication, laboratory variation, or an acute kidney problem and usually needs context or repeat testing.
- An eGFR below 60 mL/min/1.73 m² that persists
- Albumin or protein in the urine
- Persistent blood or other abnormalities in urine when kidney disease is suspected
- Structural changes on imaging, biopsy findings, or a history of kidney transplantation
Causes and risk factors
Diabetes and high blood pressure are common causes of CKD, but they are not the only ones. Glomerular diseases such as IgA nephropathy, inherited conditions, immune diseases, recurrent obstruction, infections, and some medicines or toxins can also affect the kidneys.
Finding the likely cause helps the care team choose monitoring and treatment. Sometimes the cause remains uncertain even after appropriate evaluation.
Symptoms and next steps
Many people feel well in the early stages. Symptoms such as swelling, tiredness, nausea, itching, changes in urination, poor appetite, or breathlessness are not specific to CKD and should be assessed rather than used to diagnose it.
Follow-up commonly considers the cause, eGFR trend, urine albumin, blood pressure, cardiovascular risk, medicines, and complications. The plan is individual: it may include repeat tests, kidney-protective treatment, lifestyle support, or referral to a nephrologist.
For your next visit
Questions worth taking with you
- 01Which results suggest CKD in my case, and have they been present for three months?
- 02What is the likely cause, and are more tests needed?
- 03How often should my eGFR, urine albumin, and blood pressure be checked?
Evidence trail
Sources
ENKI prioritizes current clinical guidelines and public-health sources. Links open on the publisher's website.
Published by the ENKI Health Editorial Team under our editorial policy.