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Kidney Function Blood Test

Kidney Function Blood Test

Essential kidney health insight. 4-biomarker test measures Creatinine, eGFR, Sodium & Urea to assess filtering function.
£110.70
£110.70
Shipping calculated at checkout.
Expected delivery date:
05 Aug Usually ready in 2-3 days.

Product Specifications

Details

Your kidneys are your body’s natural filtration system, working constantly to clear away waste products, remove toxins, and balance your internal fluids. However, chronic kidney disease (CKD) is a long-term condition that can develop silently over many years with very few early warning signs or symptoms. Left unmonitored, progressive kidney decline can significantly increase your risk of high blood pressure, heart disease, and strokes.

The Optimal You Kidney Function Blood Test delivers essential insights into your renal health by tracking 4 key biomarkers: Creatinine, eGFR, Sodium, and Urea. Whether you want a proactive health baseline or are managing conditions that place an extra strain on your kidneys, this test provides the clinical clarity you need to take control of your health journey.

Key Core Benefits

- Assess vital waste filtering efficiency

- Detect early stage kidney decline

- Screen high risk health indicators

- Track long term medication impacts

- Fast two day digital results

Who Should Take This Test?

Kidney decline is common, and your baseline risk increases naturally as you get older. Regular screening is highly recommended if you fall into any of the following categories:

- Pre-existing Conditions: You have diabetes (where high blood sugar damages the kidney's tiny filters), high blood pressure, or high cholesterol.

- Family History: You have a close relative with a history of kidney disease.

- Medication Use: You regularly take long-term prescription or over-the-counter medications that can harm the kidneys, such as anti-inflammatories (NSAIDs like ibuprofen), ACE inhibitors (like ramipril), or certain antibiotics.

- High-Risk Demographics: It is statistically more common in individuals who are black or of South Asian descent.

What We Test: The 4 Critical Renal Biomarkers

Our targeted panel measures the key waste products and electrolytes managed by your kidneys to assess how well they are filtering your blood:

Biomarker What It Measures & Why It Matters
eGFR (Estimated Glomerular Filtration Rate)

The gold standard calculation to see how well your kidneys filter waste. Healthy kidneys filter 90ml/min or more; a lower score can indicate the stage of kidney disease.

Creatinine

A chemical waste product from normal muscle metabolism. If your kidneys are struggling to filter efficiently, creatinine levels will rise in the blood.

Urea

A byproduct formed in the liver when protein is metabolised. Elevated levels can serve as an early indicator of kidney issues or dehydration.

Sodium

An essential electrolyte that regulates your body's water balance and blood pressure. Your kidneys control this by excreting excess amounts into your urine.

🛑 Warning Signs to Look For: While early-stage kidney disease rarely causes symptoms, later-stage warnings include swollen hands, ankles, or feet (oedema) due to water retention, passing urine more frequently (especially at night), or seeing blood in your urine. If you notice these signs, clinical tracking is crucial.

How It Works

1. Order Your Kit: Purchase your test online to receive your secure testing kit with completely free delivery.

2. Collect Your Sample: Enjoy the flexibility of choosing a convenient at-home collection method or arranging a professional clinic sample collection.

3. Fast Turnaround: Return your sample in the pre-paid envelope. Your results will be securely updated in your portal within an estimated 2 working days.

4. Bespoke Doctor's Report: Every test is medically reviewed by a qualified doctor, providing clear, actionable insights alongside your biomarker data.

Biomarkers Tested

Total Biomarkers: 4

Kidney Health

Urea: A waste product formed in the liver when protein is metabolized; high levels can indicate kidney issues or dehydration.

Creatinine: A chemical waste product produced by muscle metabolism that is filtered out of the blood by the kidneys.

eGFR (Estimated Glomerular Filtration Rate): A calculated measure of how well your kidneys are filtering waste from your blood; it is key for staging kidney disease.

Sodium: An electrolyte that helps regulate water balance and blood pressure; kidneys control its levels by excreting excess into urine.

How to prepare for your test

Prepare for your test by following these instructions.

Sample collection and timing
Take this test when any symptoms of short-term illness have settled.
Avoid vigorous exercise for 48 hours beforehand, as this can raise your creatinine levels.

Fasting and hydration
Stay well hydrated before your test.
Avoid eating large amounts of cooked meat for 24 hours before your test, as this can affect your results. You do not need to fast.

Know Your Body

Know Your Body

Know Your Body

Know Your Body

  • Your Blood, Your Way

    Do at home with our kits or have a professional collection arranged.

  • Extensive Clinic Network Across the UK

    Arrange professional blood draws from on of our partnered clinics around the UK

  • Fast & Secure Delivery

    Safe and timely delivery of blood test collection kits to your doorstep.

  • Blood Diagnostics, Without The Wait

    Fast and convenient blood collection and diagnostics, without having to wait.

Optimal You Partner Clinic Finder

How Your Clinic Visit Works

  1. Find a Location: Enter your postcode in the finder above to discover your nearest approved clinic.
  2. Book Your Sample Draw: Follow the clinic links sent to you from our partners to confirm your appointment time.
  3. Bring Your Kit: Attend your appointment with your Optimal You test kit and pre-printed blood sample collection materials.
  4. Rapid Results: Once drawn, your sample is safely couriered directly to our accredited laboratory network.

Why Choose a Venous Sample Draw?

While finger-prick kits offer convenient home collection, attending an accredited partner clinic for a professional venous sample draw ensures:

  • Maximum Biomarker Accuracy: Venous draws yield larger, higher-quality blood samples ideal for complex testing panels.
  • Low Risk of Hemolysis: Professional collection by trained phlebotomists prevents sample degradation.
  • Painless Experience: Fast and comfortable sample collection conducted by experienced medical professionals.

3 Simple Steps - How to Take Your Test

Step 1

Receiving Your Test Kit

Order your at home finger prict test with Optimal You. You'll receive everything you need within your kit along with pre-paid packaging for you to post your sample directly to our partner laboratory for analysis.

Step 2

Collecting Your Sample

Following the provided guide, use the simple finger-prick method to prick your finger and drip your blood sample directly into the vial.

Step 3

Receiving Your Results

Post your sample to the lab using the prepaid envelope and packaging enclosed. Your results will be securely sent to you via email within 3 working days (estimated)

Frequently Asked Questions

Frequently asked question about our blood testing and diagnostic services. If there is a question not answered feel free to contact us!

Are there any age restrictions for your tests?

Yes, our services are currently available only to individuals aged 18 and over. We require you to confirm your Date of Birth in your Customer Account area.

Can I book a professional to take my blood?

Yes! We offer options for a clinic visit or a nurse home visit for a professional venous draw. You can select this option when choosing which test is right for you!

If you prefer to book your own phlebotomist, no problem! Simply select this option prrior to processing your order and we will send the kit to your home for you to arrange your own clinic visit.

Can I share my results with my own GP?

Yes, and we encourage it! You can download your doctor-reviewed report as a PDF from your secure portal to share with your GP or specialist during your next appointment.

Can I take these tests if I am pregnant or breastfeeding?

While you can take the tests, pregnancy and breastfeeding significantly alter your hormone and nutrient levels. This means our standard "normal" ranges may not apply to you. We recommend consulting your midwife or GP before ordering.

Can I use these tests to monitor an existing medical condition?

Our tests are excellent for tracking trends and monitoring wellness. However, they should not be used to self-diagnose or adjust prescribed medication without first consulting your treating physician and GP.

Do I need a doctor’s referral or a prescription?

No. Optimal You provides a private service that allows you to take control of your health data without needing to visit a GP first.

How do I get started with a blood test?

Simply choose your test on our website and checkout. 

Whilst on the particular test you are looking to purchase, select a test type from the drop down. You have three or four options depending on the type of test you are purchasing:

At Home Finger Prick Blood Test - You will receive you sample kit via the post. Simply follow the instructions enclosed and return using the packaging provided.

Book a Venous Draw at a Clinic - You will receive an email after you have processed your order containing instructions on how to book your clinic appointment. Our partners have national coverage of the UK to make your sample collection convenient to you whilst maintaining our quick service times. You can find your closest clinic via our partner medichecks on our clinic finder page.

Book a Venous Draw at Home with a Nurse - Once you have chosen this option, simply go through our checkout process, a nurse will be in touch to book your at home visit to complete your sample.

Self arrange a Profesional Sample Collection - You will receive your sample collection kit in the post for you to take to your chosen phlebotomy clinic. Note you will be responsible for arranging your appointment and for any associated fees.

How long does it take to get my results?

Most results are ready within 2–5 working days after the lab receives your sample. You will receive an email notification as soon as they are ready.

How soon do I need to post my sample back?

To ensure the stability of your biomarkers, you should post your sample on thesame dayyou collect it. Avoid collecting samples on a Friday afternoon or over the weekend to prevent them from sitting in the post; Monday through Thursday is best.

Is my data secure?

Absolutely. We use industry-standard encryption, and your data is stored securely in compliance with GDPR. Only you and our medical team have access to your results.

Is there a specific day or time I should take my sample?

Most tests are best performed first thing in a morning, especially if fasting is required. For hormonal tests (like Testosterone or Menopause profiles), we usually recommend collecting your sample before 10:00 AM when hormone levels are most stable.

You will receive additional guidance post purchase to give you all of the information needed as some tests have different guidelines.

What happens if I struggle to get enough blood from a finger-prick?

Don't worry, it happens! We include extra lancets in every kit. Pro tip: Make sure your hands are very warm (try soaking them in warm water) and stay well-hydrated for 24 hours before your test. If you still can't collect enough, contact us and we can help you arrange a venous blood draw instead.

What happens if my results are abnormal?

If a result is critically outside the normal range, our medical team will highlight this and provide clear guidance on the next steps during our contact with you, which may include you seeing your GP, going to A&E or calling the NHS on '111'.

What is the difference between a Finger-Prick and a Venous Draw?

A finger-prick is a self-collection kit done at home. A venous draw is a traditional blood sample taken from a vein by a professional. Some advanced tests (like our TRT or Enhanced Profiles) require a larger sample and are best done via a venous draw.

Who reviews my results?

Every report is reviewed by a qualified UK doctor. They provide personalized comments to help you understand what your biomarkers mean for your health.

Why are my results different from a previous test I had?

Biomarkers can fluctuate based on the time of day, your diet, stress levels, recent exercise, or even the lab equipment used. This is why we focus on "ranges." If you see a significant change, our medical team’s comments will help put that data into context.

Person holding a teal 'Optimal You Sample Collection' packet against a gray background

Kidney Function Blood Test

£110.70
£110.70