Tuli - Kidney Function Test

Kidney Function Test

Check if your kidneys are working as they should be

Available as:

  • Results in 2 working days
  • Verified by clinical scientists and doctors

Certified for quality and safety

What we measure

This test measures three markers of health that indicate whether the kidneys are working properly. The kidneys filter out waste from the blood and then transform it into urine so it can be passed out of the body. The below markers can tell us how well that process is working, which can signal whether the kidneys are functioning normally.

This test can help indicate if you’ve got kidney disease.

Your kidneys’ main job is to remove toxins and waste from your blood, and to make sure these are passed out of your body as urine. They also make sure your body has the amount of water it needs to function and release a number of essential hormones.

When your kidneys can’t do these jobs properly, waste products (like urea and creatinine) and excess fluid can accumulate in the body and cause health problems.

A blood test is the main way to investigate whether you’ve got kidney disease. You may need one if you’ve got symptoms of kidney disease, including fatigue, decreased appetite, weight loss, shortness of breath, and blood in your urine.

In the early stages, kidney disease doesn’t usually have any symptoms, so a test may be recommended if you’re at a high risk of it developing. People with diabetes, high blood pressure, or a family history of kidney disease fall into this camp.

How it works

Need a health test? We make it easy

Order the test via our website.
Pick it up from your local pharmacy or get it delivered

Do the test.
Leave your sample at the pharmacy or post it back to us (it’s free)

Get your results in 2 working days

Your results:
what to expect

Your test results will tell you how much urea and creatinine are in your blood, plus a calculation of your eGFR, and whether each of these readings fall within normal ranges.

If your urea and creatinine levels are higher than normal, and/or if your eGFR is lower than normal, this can indicate that your kidneys are not functioning properly.

eGFR results are given in stages from 1-5, with stage 1 being normal function and stage 5 being the most severe level of kidney damage.

Abnormal levels of urea and creatinine can also be caused by reasons other than the kidneys. So, if you get a high result for either of these, it’s best to speak with a doctor who will be able to investigate further.

Need help? Speak with an expert

Don’t quite understand your results or simply want to see a doctor? We’ve got you sorted.

Speak to a GP

Book an online consultation with one of our GPs. We offer consultations in both English and Chinese.

Just fill out an online form and find a time that’s convenient.

Get a private prescription

Need to get your medication? Our GPs can write private prescriptions.

Tell the GP what the problem is during your consultation and they’ll take it from there. Prescriptions can be picked up at your local pharmacy.

50,000+ happy customers, and counting

Trustworthy service

“Very efficient and reliable. Prompt and friendly service. Have had bad experiences with other providers in the past. Not this time. Trust pilot is someone you can trust. No doubt will use it again when needed.”

- J Letts

Absolutely excellent!

“Need this in the medical world This service is trying to address international needs in healthcare. Great mission. Lovely people.”

- JJ

Great customer service

“I have used the services of TULI Health a few times and have always been happy with the quality and delivery of them. The team is professional and efficient - I’d recommend it to others for sure.”

- Caroline


What is the most accurate test for kidney function?

Blood tests are the main way to test for kidney disease. Your eGFR is considered the most accurate way to identify changes in kidney function, which is calculated using the amount of creatinine in your blood.

Depending on your situation, your doctor might suggest other tests to assess your kidney health, such as an ultrasound scan or urine test.

How do you test for kidney stones?

If you think you have kidney stones, your doctor may suggest a blood or urine test. If you have passed any stones, they may want to examine those as well.

A kidney function test can indicate kidney stones, as they can cause eGFR to drop. However, your test result can’t diagnose kidney stones on its own.

If you have abnormal results, your doctor may wish to run further tests that are specifically focused on identifying kidney stones (for example that look for levels of minerals in the blood that can cause stones to form) rather than kidney health more generally.

Can a blood test detect kidney problems?

Yes, a blood test can evaluate whether your kidney is working as it should be. Your eGFR is considered the most accurate measure of this.

Blood test results are not a diagnosis in themselves but they are often an important step towards getting one. Your results can help doctors decide whether and how they should investigate further, and can be used alongside other findings to diagnose disease.

Do I need to fast before a kidney function test?

Nope, fasting isn’t required for this test, but it’s recommended that you avoid meals high in protein as this can increase levels of creatinine and urea.

Can dehydration affect kidney function tests?

Yes, it can. Staying hydrated is super important for kidney health. If you don’t drink enough water, the kidneys reabsorb whatever is in your system rather than passing it out as urine. This can cause waste products to build up inside the body, which can increase levels of urea.

Does alcohol affect kidney function tests?

Alcohol is a diuretic, which means that it dehydrates you. Being dehydrated can affect your results.

You can reduce the risk of dehydration by drinking within the recommended limits, which is 14 units of alcohol per week for an adult in the UK, and by drinking glasses of water in between alcoholic beverages.

Tue September 2023
Results Received

Ready to find out what’s up with your health?

Accredited for: Sampling for COVID-19

All our partner labs hold UKAS accreditations

Contact us

2.04 Cannon Wharf, Pell Street

Tuli 2023