Skip to content
Maidstone, Exeter and Plymouth are now open!
Maidstone, Exeter and Plymouth are now open!

Advanced Kidney (Renal) Function Blood Test

Original price £99.00 - Original price £99.00
Original price
£99.00 - £99.00
Current price £99.00

Get a full picture of your kidney function, including electrolytes levels with our 8 checkpoints test for quick piece of mind.

  • Biomarkers: 8
  • Turnaround: 1-2 days

Simple and accurate blood test from a laboratory you can speak to.

Step 1. Choose sample collection option

Currently selected option: HOME KIT via Royal Mail Tracked 24

  • Available everywhere in mainland UK.
  • Includes everything you need to take a safe and suitable blood sample in about 15 minutes.
  • Post the sample back to our laboratory via Royal Mail Tracked 24.

Re-test guarantee

About the test

The kidney blood test is one of the most commonly performed tests by doctors and will let you know how well your kidneys are working. This is the more comprehensive version of our Kidney Function Blood Test and has 8 biomarkers.

Your kidneys perform many functions including removing waste products from the blood, regulating levels of electrolytes in the blood, and regulating blood pressure. Kidney function tests are amongst the most commonly performed tests by doctors because, not only do they indicate your state of health, but the health of your kidneys will guide decisions on which medications may or may not be right for you. This test also measures your ‘estimated glomerular filtration rate’ or eGFR.

Kidney disease can cause abdominal symptoms such as loss of appetite of nausea.

Please note that Potassium is only offered in the clinic version of the test, potassium is very unstable and needs to be in the laboratory the same day - it is not included in the home kit version of this test.

Not all results falling outside of the reference range require medical intervention, please consult your GP.

8 Biomarkers


    - Albumin
    - Total protein
    - Urea
    - Creatinine
    - eGFR (Calculation, we will need your age, sex and ethnicity for this).


    - Sodium
    - Potassium (clinic only, not available in the home kit due to very unstable nature of potassium)
    - Chloride


    Need more biomarkers? Check out the Essential All Systems Blood Test.


    For most biomarkers our usual turnaround time is 24-48 hours, or less, from the time your sample is in our lab. We do not wait for all the results to complete before sending them to you, so you may start receiving results the same day for most cases, or as results become available.

    We are extremely proud of our very short turnaround times and a very efficient laboratory processes. Whilst we accommodate the shortest of time scales, with some results available within hours, for this particular test the usual turnaround time is:

    1-2 days

Doctor's notes

Hi, I am Dr. Adam Staten and here's my view on this test as a GP and Clinical Director at One Day Tests.

The kidneys perform a number of essential functions including removing waste products from the blood, regulating blood pressure, and maintain the correct levels of electrolytes in the blood stream. They can be damaged by infections, inherited or acquired diseases, by toxins and by medications. 

Because kidney disease often causes no symptoms in the early stages, it can easily go undetected. This test measures your ‘estimated glomerular filtration rate’ or eGFR. This is worked out by a calculation based on the level of a waste product called creatinine in our blood, your age, your ethnicity, and your sex. The eGFR is basically a score of how well your kidneys are functioning. Above 90 is considered normal, above 60 is generally considered acceptable, and below 60 is usually considered to be kidney disease. 

Whilst it is possible to have kidney disease with a normal eGFR, a normal result is generally reassuring. eGFR does commonly decline with age so a low eGFR may not represent a significant problem but it is useful to know because it will affect which medications, and what dosage of medications, might be right for you, and may also influence decisions about how to treat other thing such as your cardiovascular risk and your blood pressure.

Red flag symptoms for the Advanced Kidney (Renal) Function Blood Test

Even if the blood test is normal, you should still see your doctor if you have any of the symptoms below. 

  • Swollen around the ankles, eyes or abdomen 
  • Lower than expected urine output 
  • Passing a lot more urine than normal 
  • In men; symptoms of difficulty passing urine, getting up more than usual at night to pass urine, or being unable to fully empty your bladder

Your Results and Health Dashboard

The results of your Advanced Kidney (Renal) Function Blood Test will be emailed to you as a secured PDF file, ready for your GP and will also be uploaded to our Health Dashboard area of the website. It’s a unique and powerful tool, powered by our in-house clinical analysis research, to match your biomarkers across test panels and symptoms, as well as provide clinical commentary on all individual biomarkers you tested for.

The health dashboard will also provide "panel level" commentary - a birds eye view of the biomarkers that were tested. This feature allows you to view your test results and clinical commentary, and compare them to previous results, giving you a clear understanding of how your health is progressing.

By using the Health Dashboard, you can identify changes in your biomarkers and make necessary adjustments to your lifestyle. This added value is immense, as it empowers you to monitor your health and make informed decisions about your well-being.

It's free and is available with all of our tests.

Save on continuous monitoring with our subscription plan

The best way to look after your health is to do so regularly. This is easy to do with our continual monitoring plans which give you a discount on future blood tests. You choose the frequency and we'll do the rest.

When you purchase a subscription, we will deliver your home test kits or allow you to book appointments in line with your chosen frequency. You will be able to track your biomarkers over time in our powerful Health Dashboard, where results will be automatically updated for you. There is a minimum of 3 tests with any subscription, after which you can pause/restart/cancel at any time.

Special instructions

Hi, I am Stefania Brown, I am the Laboratory Manager at One Day Tests and here are the lab's special requests for the Advanced Kidney (Renal) Function Blood Test.

Try to be well hydrated for this test.

If you have recently taken the antibiotic trimethoprim (usually for a urinary tract infection), delay taking this test for a couple of weeks.

Venepuncture appointment - how to prepare

If you are coming into one of our clinics for the test, this is what you need to do before you arrive:

  • Drink plenty of water about an hour before the appointment.
  • Avoid coffee/tea/energy drinks. Water is good!
  • That’s it! We’ll do the rest.

Home test kit for Advanced Kidney (Renal) Function Blood Test - how it works

Our blood test kits are simple and convenient.

The most important step in doing a blood test at home is to read the instructions very carefully. The process is very simple, but there are a few pitfalls you need to be aware of - you will save yourself a lot of time if you do it right the first time around!

  • Full printed instructions will arrive with your kit - please read them carefully.
  • Drink plenty before taking the sample and warm your hands up in the sink with warm water for a few minutes. This will make your blood flow much better.
  • Fill the tubes to the top line. We don’t need much blood; filling tubes to the top line is about 15 drops of blood.
  • Post the samples on the same day you take them, before midday, Monday to Thursday. If you post it any other time it might get to us late or be stuck at a sorting office over the weekend. You will then have to do it again.
  • Package the sample in the same box the kit came in. Otherwise, Royal Mail or DPD will reject it. The sample tubes go into a pouch, then into a cardboard box, and then into a return envelope. All of this is provided in the kit: please use it.

We look forward to receiving your sample in our lab!

How the finger prick home test kit for Advanced Kidney (Renal) Function Blood Test works - from Dr. Adam Staten

Why choose us?

Hello! My name is Dr. Vinesh Mistry, I am part of the GP team here at One Day Tests and here is why you should trust us to test your blood.

We run our own regulated laboratories and our own accredited clinics. We manufacture our own approved home sample collection kits. Your results are looked after by our fantastic clinical governance team and our super-talented biomedical science team.

When you book your test with us - you book directly with the lab. This means accuracy and responsible duty of care, direct access to the provider and extremely fast turnaround times.

Finally, our customer services rock! You can ask the lab a question any time or you can speak to a real human. It's good to WhatsApp, email on or give us a call on 0845 527 07 67.

Frequently Asked Questions

Hi, I am Lana Nela, Lead Nurse, and here is what we are frequently asked about this test.

What does it mean if my eGFR is low? 

A low eGFR can occur for lots of reasons. eGFR can fall in the short term due to acute illnesses, particularly illnesses that result in dehydration such as diarrhoea and vomiting, or sometimes as a result of using some medications (for example the antibiotic trimethoprim can cause a falsely low eGFR). A persistently low eGFR may represent a gradual decline in kidney function as part of ageing or may represent an underlying kidney disease. So, a low eGFR is normally repeated and, if it remains low, further investigations are usually started. 

What are common causes of kidney diseases? 

There are numerous types of kidney disease but common causes of kidney disease are poorly controlled diabetes and high blood pressure. 

Can this test tell which kidney has a problem? 

No, this test provides an overall assessment of kidney function. Often, if there is a problem with one kidney, the other kidney can adequately compensate, for example, people who have donated a kidney to someone else, often have healthy looking kidney function.

Why take this test?

Hi, I am Dr. Marco Esposito and here is why it's important to take this test.
  • As part of an overall assessment of your health 
  • To check for unrecognised kidney disease 
  • To monitor kidney function if you already have a condition that might harm the kidneys such as diabetes

Is this test right for you?

Hi, I am Sandeep Patel, I am the Laboratory Director at One Day Tests. Here are the symptoms that you may wish to address with this test.

As the kidneys perform so many vital functions, the kidney blood test is a very useful part of any general health check.

Kidney disease often has no symptoms in its early stages so this test may help you pick up a problem early.

You may be particularly interested in this if you have a family history of kidney disease.


    Blood in urine, Chronic fatigue, Erectile disfunction, Feeling sick, Headache, Insomnia/lack of sleep, Itchy skin, Muscle cramps, Need to wee often, Poor appetite, Shortness of breath, Swollen ankles, Swollen feet, Swollen hands, Tiredness, and Weight loss

Why blood tests are important.