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Kidney Health
The kidneys quietly filter your entire blood supply many times a day, balance fluids and salts, help control blood pressure and even signal the bone marrow to make red blood cells — yet most people only think about them when something goes wrong. This quiz covers the essentials in five questions: the kidneys' jobs, what an eGFR result means, what dialysis does, what kidney stones are made of, and the two conditions that damage kidneys most often. It is general education; kidney results are always interpreted by your own clinician in context.
✓ Medically reviewed by Dr. Mohamed Ibrahim, MD, PhD — physician-scientist · Last reviewed: October 2026
How it works: five questions, one best answer each. Tap an answer and you will see straight away whether it is right, with a short explanation of the reasoning. Your score builds as you go — there is no timer and no account needed.
Question 1 of 5
Which of these is NOT one of the kidneys' jobs?
The kidneys filter waste, balance fluids and salts, help control blood pressure, and make erythropoietin — the hormone that prompts red-blood-cell production. Insulin is made by the pancreas, not the kidneys.
Question 2 of 5
An eGFR result estimates kidney function. It is calculated mainly from…
eGFR (estimated glomerular filtration rate) is calculated from a blood creatinine measurement combined with age and sex. It estimates how well the kidneys are filtering and is used to stage and monitor chronic kidney disease.
Question 3 of 5
What does dialysis do?
Dialysis takes over the blood-cleaning work of kidneys that can no longer manage it — removing waste products, salts and excess water — either through a machine (haemodialysis) or using the lining of the abdomen (peritoneal dialysis). It replaces kidney function; it does not cure the kidneys.
Question 4 of 5
Most kidney stones are made mainly of…
The large majority of kidney stones are calcium-based, most often calcium oxalate. Other types — uric acid, struvite and cystine stones — do occur but are less common, and analysing a passed stone helps guide how further stones are prevented.
Question 5 of 5
In most countries, the two most common causes of chronic kidney failure are…
Diabetes and high blood pressure damage the kidneys' tiny filtering vessels over many years and are the leading causes of kidney failure in most countries. Protecting the kidneys starts with controlling both.
Your result
Keep learning
eGFR Calculator — Kidney FunctionEstimate glomerular filtration rate from creatinine, age and sex, and see the CKD stages.Open → Dialysis — Condition HubHaemodialysis and peritoneal dialysis explained, with guides and videos.Open → Kidney Stones — Condition HubSymptoms, diagnosis, treatment and preventing the next stone.Open →Frequently asked questions
Can damaged kidneys heal?
It depends on the cause. Kidney function that drops suddenly (acute kidney injury) can partly or fully recover if the cause is treated quickly. Long-standing chronic kidney disease usually does not reverse, but its progression can often be slowed a great deal — which is why early detection through blood and urine tests matters.
What is the difference between kidney stones and kidney failure?
They are different problems. Kidney stones are hard deposits that form in the urinary tract and cause trouble mainly by blocking flow and causing pain. Kidney failure means the kidneys' filtering function itself has fallen too low. The two can occasionally be linked — a blocked kidney can be damaged — but they are assessed and treated differently.
These quizzes are for learning only. They are not medical advice, cannot diagnose anything, and do not replace assessment by a qualified clinician. If you have symptoms now — especially chest pain, severe abdominal pain, or sudden weakness or speech problems — seek urgent medical care.