Liver Function Blood Test
Results in 2 working days
Check your liver and kidney function to understand your risk of developing liver disease with our at-home liver health test.
10 Biomarkers
£49
Results in 2 working days
10 Biomarkers
Check and monitor your kidney health with a renal blood test from the comfort of home. Our kidney function blood test measures key markers like creatinine and eGFR to help detect early signs of kidney issues. With fast, lab-certified results and expert insights, you can take charge of your well-being without visiting a doctor.
£49
What gets tested?
10 Biomarkers
Blood sample collection options
WHEN TO TAKE THE TEST?
If you have consumed a large amount of alcohol, we recommend leaving a gap of 72-96 hours before taking this test.
Poor diet, dehydration, high salt intake, and excessive alcohol can all impact your kidney function.
Our kidney function blood test can be done at home or one of our partner clinics, making it an easy and convenient way to proactively manage your kidney health. The at-home kit includes everything you need to collect a small blood sample and post it back to our labs for analysis.
Kidney disease can develop silently, with no obvious symptoms until it’s too late. A simple blood test can identify issues before they become serious. And with HealthCoach, you’ll get personalised insights and recommendations to help you manage your renal function.
Our data shows that only 27% of adults have a urea level in the “Excellent” range[1].
[1]Based on 3,096 HealthCoach reports from Forth customers, February 2025
10 Biomarkers
Alanine Aminotransferase (ALT)
Alanine aminotransferase (ALT) is an enzyme primarily found in the liver. Only small amounts are usually found in the blood. However, if the liver or muscles are damaged an increased level of ALT will be released into the bloodstream. Elevated ALT levels can be caused by alcohol, fatty liver, viruses, or intense exercise.
Alkaline Phosphatase (ALP)
Alkaline phosphatase (ALP) is an enzyme found in high concentrations in the bones and liver. It is measured in liver function tests to assess liver health. Elevated ALP levels can indicate liver diseases such as hepatitis, cirrhosis, or bile duct obstruction.
Albumin
Albumin is a protein produced by the liver, crucial for maintaining blood volume and pressure. Low albumin levels can indicate liver dysfunction, as the liver's ability to synthesize this protein is compromised. Monitoring albumin helps assess liver health, diagnosing conditions like cirrhosis, hepatitis, and other liver diseases.
Gamma GT (GGT)
Gamma-glutamyl transferase (GGT) is an enzyme found mainly in the liver. The concentration of GGT within the bloodstream increases when there is either damage to the liver or bile ducts, or when there is increased production of GGT within the liver. This can occur due to taking many medications, smoking, poorly controlled diabetes and excessive alcohol consumption.
Globulin
Globulins are proteins produced by the liver and immune system and is a general term to describe more than 60 proteins. Measuring globulin in liver health tests is important in the assessment of liver function. Abnormal globulin levels can indicate liver dysfunction or chronic liver diseases like cirrhosis or hepatitis.
Total Protein
Total protein test measures the quantity of protein present within your bloodstream and is a combination of both albumin and globulin levels. Measuring total protein in liver function tests assesses the liver's ability to synthesize proteins, indicating liver health, nutritional status, and helping to identify liver diseases like cirrhosis and hepatitis.
Creatinine
Creatinine is a waste product which is produced by muscles when they break down creatine. It is excreted from the body by our kidneys in urine. Therefore, the levels of creatinine can give a good indication of how effectively the kidneys are working. Elevated levels suggest potential kidney stress or increased muscle metabolism.
eGFR
Estimated glomerular filtration rate (eGFR) measures how well the kidneys filter waste from the blood. It helps detect kidney disease early and can provide an overall assessment of kidney function. The calculation is based on levels of creatinine and results can be influenced by a number of factors including muscle mass, weight and hydration.
Urea
Both urea and creatinine are good indicators of whether the kidneys are working properly. Urea is a waste product formed in the liver when protein is metabolised. It is released into the bloodstream and carried to the kidneys where it is expelled within urine. If the kidneys are not performing correctly the level of urea will rise.
Uric Acid
Uric acid or urate is a natural waste product produced when the body breaks down purines. Most uric acid is removed from the body by the kidneys. Too much uric acid can lead to the formation of solid crystals in the joints - known as gout. High levels can also lead to the formation of kidney stones.
Getting the insights you need to improve your health has never been easier.
Collect a small blood sample and post it to our accredited labs for analysis using the Tracked24 envelope included in your kit.
You’ll receive a detailed report with your personalised scores, insights into your kidney function, including doctor-reviewed comments.
Your results highlight areas needing attention, giving you the data to seek further help.
HealthCoach gives you the power to change your health. Unlock your kidney scores, personalised insights and goals to aim for.
"A renal function test assesses how well your kidneys are working. It typically involves measuring creatinine and blood urea nitrogen levels in your blood. These values help determine if your kidneys are effectively filtering waste and regulating the balance of fluids and electrolytes in your body. Abnormal results may indicate kidney problems."
Dr Thom Phillips
Clinical lead
Our team of specialist doctors, dieticians and biomedical scientists are here to help you be in the best of health.
This is what our customers ask us about the most. For more information, try our help centre.
What does this test check?
This kidney function blood test helps detect a range of potential kidney-related health issues:
While this test can indicate an increased risk of kidney stones (due to high uric acid levels), it does not directly diagnose existing stones. If kidney stones are suspected, further imaging tests such as an ultrasound or CT scan may be required.
By analysing these biomarkers, this renal blood test provides a detailed picture of kidney health, helping to detect potential issues early so you can take proactive steps to protect your well-being.
Can I check kidney function at home?
Yes – our kidney function test can be done at home using a fingerprick kit. The kit comes with everything you need to collect a small blood sample from the tip of your finger.
We also offer the option to have a trained healthcare professional (phlebotomist) visit you home to collect the blood from your vein (called a venous draw).
What is the function of the kidneys?
Your kidneys filter waste, balance fluids, regulate blood pressure, and support red blood cell production. They also help maintain strong bones and overall well-being. Keeping them healthy with hydration, a balanced diet, and regular checks is key to preventing future issues.
What causes kidney disease?
Kidney disease develops when the kidneys are damaged by high blood pressure, diabetes, infections, or lifestyle factors like dehydration and poor diet. Because it often has no early symptoms, kidney problems can go unnoticed. Regular testing helps detect issues early, giving you the chance to take action before damage worsens.
What are the warning signs of kidney disease?
Early kidney disease is often symptomless, but warning signs include fatigue, swelling, changes in urination, puffiness around the eyes, and high blood pressure. As kidney function declines, symptoms worsen. Regular blood tests can detect problems early, helping you take control of your kidney health before complications arise.
How can I reduce my risk of kidney disease naturally?
Stay hydrated, eat a balanced diet, and manage blood pressure and blood sugar levels. Avoid excessive salt, alcohol, and smoking while maintaining a healthy weight. Regular health checks help catch problems early, giving you the best chance to protect your kidney function and overall well-being.
How and when will I get my results?
Your results are delivered to your account and can be viewed on the Forth app. We aim to get your results to you 2 working days from the date your sample reaches our lab.
How soon will the test arrive?
Once you place your order, your test kit will be dispatched the same day (if ordered before 3 pm on weekdays) via Royal Mail Tracked-24, meaning you should receive it within 1-2 days.
What is a health score?
Your health score is a personalised rating based on your test results. Scores range from 0 (poor) to 100 (excellent). It helps you understand how well your kidneys are functioning and highlights any areas that may need improvement.
Health sores are included at no extra cost and can be viewed in our app.
How often should I check my kidney health?
If you have risk factors like high blood pressure, diabetes, or a family history of kidney disease, we recommend testing every 6 months. Regular checks help catch potential issues early, giving you the best chance to protect your kidney health.
Is your packaging discreet?
Yes, all of our test kits are sent in plain, unbranded packaging for complete privacy. There are no logos or markings that indicate the contents, ensuring a discreet and confidential delivery. Your test results are also stored securely in your online account, accessible only to you.
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Kidney Function Blood Test