Kidney Function Test
Kidneys are important because they remove waste products from the blood and produce urine. Signs of kidney dysfunction include abdominal symptoms such as loss of appetite or nausea. Get tested at home to see if your kidneys are functioning normally.


MEDICAL INFORMATION
Kidney Function Test Key Facts
Why regular kidney function testing is important: Using at-home kits for early detection
If you have been diagnosed with kidney (renal) disease and want to monitor your kidney function, are in a high-risk group, have high blood pressure, diabetes, or you simply want to check your kidney function as part of a general health check-up, our easy to use kidney function test is available for early detection.
How at-home kidney function test kits monitor your urea and electrolytes levels
The Kidney function test kit checks for specific biomarkers in your blood. These include:
- Urea is produced when the body breaks down proteins in the liver. Urea is transported to the kidneys, which remove it from the body as urine. Urea levels in the blood can be used to see how well both the liver and the kidneys are working
- Creatinine is a waste product generated from normal muscle metabolism. It is also an accurate measure of kidney function and may help to diagnose kidney disease
- Estimated glomerular filtration rate (eGFR) estimates the amount of blood filtered through the kidneys and helps to assess how well the kidneys are working. The glomeruli are tiny filters in the kidneys responsible for removing waste products. The eGFR is calculated using your age, gender, ethnicity, and serum creatinine levels
What are the signs that your kidneys are not working properly
The warning signs of kidney disease include:
- Swollen ankles, feet, or hands
- More frequent urination
- Blood in your urine
Kidney damage can increase your risk of high blood pressure, heart disease, or a stroke.
How to use a kidney function test kits at home
You can take our Kidney Function Blood Test in the comfort of your home using our finger-prick blood test kit. We’ll send you everything you need, including instructions and a pre-paid return envelope for your blood sample.
What are the benefits of the kidney function blood test?
- The home test kits are assembled within the UK
- All test kits are security sealed with confidential health test results
- All laboratory testing is performed in an ISO:15189 accredited clinical laboratory
Frequently Asked Questions about Kidney Function Tests
What causes kidney disease?
Kidney disease is often caused by a combination of risk factors which put strain on your kidneys. One of the main causes is diabetes, where excess glucose in the blood damages the filters in the kidneys. Other causes include high cholesterol, high blood pressure, and glomerulonephritis, which can cause inflammation in the kidneys. Smoking, being overweight, certain drugs and excess alcohol intake can also increase your risk of getting kidney disease. The risk of kidney disease increases as you get older and is more common in black or of South Asian people.
What is CKD?
CKD (chronic kidney disease) is a long-term condition. It can develop over many years with few symptoms, especially in its early stages. CKD gets worse over time, with the kidneys stopping working altogether. This however does not occur in everyone and many people with CKD continue to live long lives.
Can I take a kidney function test at home?
Yes, you can take our test at home using the finger-prick kidney test kit. We will send you clear instructions and a pre-paid return envelope for your blood sample collection.
What do at-home kidney function test reveal?
This test measures your levels of creatinine and urea. A higher than expected level could be an indication of kidney problems. Your test results also include your estimated glomerular filtration rate (eGFR), which shows how well your kidneys are filtering your blood. This can tell you if you are likely to have kidney disease, and its estimated stage.
When should I use an at-home kidney function test kit for monitoring my health?
You may have a Kidney Blood Test if you are at a higher risk of kidney disease, due to diabetes, high blood pressure, if you have a family history of kidney disease, or are taking medications that could harm your kidneys, such as NSAIDs, ACE inhibitors, or some antibiotics.
How accurate are kidney function home test kits in detecting urea and electrolyte imbalances?
Home kidney function test kits are accurate for detecting creatinine, but not for detecting electrolytes. Home kidney function test kits should not replace regular testing at your GP’s.
How long does it take to get results from an at-home kidney function test?
Your kidney function test results will be available within one working day of receiving your sample at the laboratory.
Can kidney function home test kits be used to track chronic kidney conditions?
Yes, home kidney function test kits can be used to track chronic kidney disease (CKD), but should not replace regular testing at your GP’s.
Can a blood test show kidney disease?
By calculating how well your kidneys are filtering your blood, the home kidney function test can tell you if you are likely to have kidney disease. Healthy kidneys filter about 90ml/min or more of blood. If your eGFR is below this you may have kidney disease.
Urine tests may be also be recommended. Talk to a healthcare professional about the most suitable tests for you and how often they should be performed.
How can I reduce my risk of kidney disease naturally?
Simple lifestyle changes can help to reduce your risk of kidney disease and improve your kidney health. Regular exercise, a balanced diet, low in processed foods and salt and staying well hydrated can all help protect your kidneys by helping to clear toxins from your body.
Service Guide
Everything You Need to Know About Home Health Testing
What is the Home Health Testing Service and how does it work?
Blood tests are a convenient way for you to investigate your health concerns. NowPatient’s Home Health Testing allows you to test hundreds of different biomarkers which can help confirm if your health concerns are valid or simply give you peace of mind that you are in good health.
See the video below to learn about how the service works:
What is a biomarker?
A biomarker, or biological marker, is something that can be measured to provide information about an individual’s health or the presence of disease. In the NowPatient Home Health Tests, biomarkers are used to identify normal or abnormal processes in the body, detect illnesses, monitor how a disease is progressing, or determine how well a treatment is working.
The Importance of Biomarkers include:
- Enable early detection of diseases
- Assist in selecting the right treatments
- Help monitor recovery or treatment success
- Provide a picture of overall or specific health status
What Health Tests does NowPatient offer in the UK?
NowPatient offers the following Home Health Tests for UK customers:
- Kidney Function test
- Liver Function test
- Vitamin D test
- Testosterone test
- Cholesterol test
- Diabetes test
- Syphilis test
- Chlamydia and Gonorrhoea test
- Ovarian Cancer (CA 125) test
- HIV test
- 7 in 1 STI test
- Nuts and seeds allergy test
- Food allergy test
- Milk and Milk proteins allergy test
- Shellfish allergy test
- Atopic Dermatitis/Eczema Profile test
- Allergic Rhinitis/Asthma Profile test
What Health Tests does NowPatient offer in the US?
NowPatient offers the following Home Health Tests for US customers:
- 2 Panel STI test
- 6 Panel STI test
- 10 Panel STI test
- Testosterone test
- Men’s Panel hormone test
- Women’s Panel test
Is this a safe service?
Yes. For UK users, our laboratory operates 24 hours a day, 7 days a week, and is the UK’s largest diagnostic laboratory service which is UKAS and ISO-certified.
For US users, our American laboratory is CLIA-certified and registered with the Pennsylvania Department of Health.
Our telehealth clinicians review your test results and schedule a live virtual consultation to explain the findings. After the discussion, the results are made available in your account for viewing or download, so you can easily share them with your doctor.
Are Home Health Testing kits reliable?
Yes. Our UK kits are certified by UKAS and CE-marked. Our US kits are CLIA-certified and registered with the Pennsylvania Department of Health
- Test kits have an outer seal design, with the product and regulatory information and a tamper-proof seal
- UK Test kits are registered with the Medicines & Healthcare Products Regulatory Agency (MHRA) for distribution in the UK only
- US Test kits are registered with the Pennsylvania Department of Health
- Test kits are available in multi-language translations
- Each test kit contains a warnings and precautions section with detailed information for the healthcare organisation and yourself as the patient
- Video instructions supporting the specific sample collection are provided with each Self-Collect kit. Videos are designed to emphasise the important steps associated with capillary blood sampling and do not supersede or replace the specific end-user instructions provided with each kit
Is the service available in the United States and the United Kingdom?
Yes. This service is available in the United Kingdom and the United States.
Do I need to pay for this service?
Yes, this is currently a private service. However, in the UK, this may change and may be funded by the NHS, in the future. In the US, it may be possible it is covered by insurance, but this depends on your health plan.
How do I use the NowPatient Home Health Testing Service?
Navigate to the Home Health Testing Service Card which can be found in the ‘Private Care’ section of the account homepage.
Choose ‘View Tests’ from the Options Menu on the Home Health Testing Service Card. You can now start by entering the name of the test you’re interested in using the search box.
Or, browse the full range of tests available from NowPatient. To learn more about a specific test and its benefits, click ‘View Test’.
Once you’ve made your choice, click ‘Add to Cart’ to proceed.
Follow the steps below to complete your purchase:
What Happens Next:
- Home Test Kit Delivery
Your Home Health Testing Kit will be delivered to your home or preferred address. - Collect Your Sample
Follow the step-by-step instructions included in the kit to collect your sample.
- Return Your Sample
Use the prepaid return packaging provided to send your sample back to our laboratory. - Processing & Notification
Once your sample has been analysed, you’ll receive a notification letting you know your results are ready. - Book Your Consultation
Schedule an appointment with one of our licensed clinicians to review your results. Follow the instructions below to book:How to Book a Consultation With NowPatient - View Your Results
After your consultation, your results will be available in the ‘Reports & Letters’ section on the account homepage.
How do I return the sample to your laboratory?
We supply you with a return system package. Use this to send back the sample. Samples are fully tracked and can be posted from any Royal Mail post box, for UK customers, or USPS, for US customers.
How long does it take to get the test results back?
Test results can take up to 10 working days to process from the day we receive your sample back.
What happens during the consultation?
Here’s how the virtual consultation will generally go:
- Introduction & Verification
The clinician will begin by introducing themselves and confirming your identity to ensure privacy and confidentiality. - Review of Test Results
They will walk you through your test results, explaining what each value means in simple, understandable terms.For example, if your cholesterol is high, they’ll explain how that might affect your health. - Personalized Interpretation
The clinician will consider your health history, lifestyle, and any symptoms you report to provide context. This helps them give a more accurate, personalised interpretation of your results. - Health Advice & Recommendations
Based on your results, the clinician may offer advice such as lifestyle changes, dietary suggestions, or recommend further testing or follow-up care.If the results indicate something that needs medical attention, they may advise you to consult your doctor or specialist. - Answering Your Questions
You’ll have time to ask questions or discuss any concerns. The goal is to make sure you understand your health status and next steps clearly. - Next Steps & Support
After the consultation, your results and a summary of the discussion will be made available in the ‘Reports & Letters’ section on your account homepage.
Are my results confidential?
Yes, we follow strict General Data Protection Regulations (GDPR) which came into force in May 2018. This places legal requirements on ourselves to ensure your personal data is managed securely with utmost confidentiality. Records are maintained of the processing that is carried out and reported when breaches of the regulation do occur. Our platform is also HIPAA compliant which means we are able to handle PHI (Personal Health Information) securely.
Are you able to prescribe a treatment plan, if my results indicate I need treatment?
For UK users, our prescribing clinicians may be able to provide a private treatment plan, subject to their clinical judgment. Unfortunately, we do not operate a service where you can request a certain medication.
What are the limitations of the Home Health Testing service?
All test kits have a certain level of inaccuracy, therefore results can only be taken as estimates. It should be noted that all tests are performed in strict accordance with the manufacturer’s instructions and test performance is regularly monitored through internal and external quality control for test result interpretation.
We do not recommend sending samples back between Friday noon and Monday morning due to delays.
Are there any concerns or risks I need to be aware of?
Tests cannot be performed if samples fall short of the quality, volume, or other eligibility criteria. In these cases, the laboratory may need to reject the samples, and not carry out processing. Sometimes the laboratory is able to rectify a situation and although turnaround times may be affected, it avoids having to arrange for samples to be taken again.
Tests cannot be performed if:
- incorrect sample types are received
- samples are received unprotected from light when they are required to be covered at the point of venepuncture
- samples are received in incorrect containers
- no sample received
- samples mislabelled, unlabelled, or with no forms, or no clinical information
- samples are broken or have leaked in transit
- samples are contaminated (e.g. being in the same bag as a leaking sample)
- sample stability time has been exceeded (stability time is test dependent, and also refers to tests that can only be carried out on certain days of the week)
- samples are received in expired tubes
- the laboratory will not accept samples packaged with needles of any kind


















