Fingerstick
Creatinine (fingerstick)
Measure your kidney function at home with creatinine finger prick including eGFR and CKD-EPI calculation.
€ 17,00
Fingerstick at home – no collection point needed
How it works
See fingerstick instructions- 01
Receive your fingerstick kit
You receive a fingerstick kit with clear instructions
- 02
Prick & collect
Easily collect a few drops of blood yourself
- 03
Mail back
Return via medical mail to the lab
What is Creatinine?
Creatinine is a waste product that results from the normal breakdown of muscle tissue. It is transported through the bloodstream to the kidneys, where it is filtered and excreted through urine. Creatinine is an important biomarker for kidney function.
What is eGFR and CKD-EPI?
The eGFR (estimated Glomerular Filtration Rate) is a calculation that provides an estimate of how well your kidneys are functioning. It is calculated using the CKD-EPI formula (Chronic Kidney Disease Epidemiology Collaboration), the most accurate and current formula for estimating kidney function.
The CKD-EPI formula uses:
- Your creatinine value
- Age
- Gender
The eGFR indicates how much blood (in milliliters) your kidneys can filter per minute per 1.73m² body surface area. This provides a much more accurate picture of kidney function than creatinine alone.
Why would you test Creatinine and eGFR?
Testing creatinine and calculating eGFR is essential for assessing kidney function. This combination provides the most complete picture of how well your kidneys are working. The test is used for:
- Routine check-ups and preventive screening
- Suspected kidney disease
- Monitoring known kidney diseases
- Assessment of medication dosing (many medications are excreted through the kidneys)
- Evaluation of risk factors such as diabetes and high blood pressure
- Screening for family history of kidney disease
What does it indicate?
The eGFR is the primary indicator of kidney function and is classified into different stages:
- ≥90 mL/min/1.73m²: Normal to excellent kidney function (stage 1)
- 60-89 mL/min/1.73m²: Mildly decreased kidney function (stage 2)
- 45-59 mL/min/1.73m²: Moderately decreased kidney function (stage 3a)
- 30-44 mL/min/1.73m²: Moderately to severely decreased kidney function (stage 3b)
- 15-29 mL/min/1.73m²: Severely decreased kidney function (stage 4)
- <15 mL/min/1.73m²: Kidney failure, dialysis may be needed (stage 5)
What does elevated Creatinine / low eGFR mean?
Elevated creatinine and low eGFR indicate decreased kidney function. The kidneys are less able to effectively filter waste products from the blood. Possible causes include:
- Chronic kidney disease (most common)
- Acute kidney injury
- Dehydration (temporary)
- Diabetes or high blood pressure (damage kidneys over time)
- Nephrotoxic medications (NSAIDs, certain antibiotics)
- Kidney stones or urinary tract obstruction
- Very high muscle mass or intense training (can temporarily raise creatinine)
What does low Creatinine / high eGFR mean?
Low creatinine is less common and may indicate:
- Decreased muscle mass due to age, illness, or malnutrition
- Severe liver disease (reduced creatine production)
- Pregnancy (physiologically decreased)
A very high eGFR (>120 mL/min/1.73m²) is often normal in young, healthy people. It can also occur with hyperfiltration in early-stage diabetes, where the kidneys temporarily work harder.
Preparation
For the most reliable results, it is recommended to:
- Fast for 8-12 hours before the test
- Avoid heavy physical exercise 24 hours before the test
- Be well hydrated
- Kreatinine
- eGFR
Strong scientific evidence
This test is included in Dutch healthcare guidelines and is regularly used for its respective indications.
Rationale for this test
Creatinine en eGFR (berekend met CKD-EPI formule) zijn standaard-bepalingen in Nederlandse zorgrichtlijnen voor het beoordelen van nierfunctie. De NHG-Standaard Chronische nierschade beschrijft creatininemeting via vingerprik als gevalideerde methode, en de CKD-EPI formule is de aanbevolen berekeningswijze voor eGFR. Deze test heeft een goed onderbouwde klinische betekenis voor screening, monitoring en diagnostiek van nierziekten.
Sources consulted
Dutch clinical guidelines and healthcare organisations
Independent information sources
We recommend consulting these independent sources before ordering a preventive health check.
- Client brochure PGO (NVvPG, September 2023)
Brochure on preventive health checks: careful choice, reliability, pros and cons, checklist.
- RIVM — Health tests
Independent information about preventive health checks from the National Institute for Public Health and the Environment.
- Thuisarts.nl
Reliable patient information about illnesses and complaints from Dutch GPs (NHG).
- Allesovertesten.nl (NVKC)
Public-facing website of the Dutch Society for Clinical Chemistry with explanations of blood tests and laboratory values.
Practical information
Frequently asked questions
See fingerstick instructionsFull instructions with visual guidanceHow does the fingerstick test work from A to Z?
After ordering we ship the collection kit to your home. You prick your fingertip, collect a few drops of blood, return it in the envelope, and receive your result digitally by email.
How do I collect my blood sample?
A small prick on your fingertip lets you collect a few drops into a tube. The instructions include step-by-step photos and video, so no guessing required.
When and how do I receive my result?
Usually 2 to 5 working days after the lab receives your sample. You receive your laboratory report securely by email. It lists the measured values, units, reference ranges and any flags added by the laboratory.
What if the collection doesn't work?
Some people find the fingerstick tricky at first. Warm your hands, hang your arm down, and prick the side of the fingertip for better blood flow. If it still doesn't work, get in touch.
How do I return my sample to the lab?
In the included return envelope with free medical shipping. Drop it in the mailbox; the lab processes your sample as soon as it arrives. For some tests it's important to send it the same day — the instructions make this clear.
What if I have questions or something doesn't work?
Feel free to contact us via WhatsApp, email or phone. We're happy to help you before, during or after your test. If the collection doesn't work, we'll arrange a solution or send new materials — no hassle.
This is why clients choose us
Client experiences
90% recommend usBased on 344 verified Trustpilot reviews
View all reviews“Very positive experience”
From ordering to having my blood drawn, everything went smoothly and was well organised. I really appreciated being able to visit a blood collection location in my own town so quickly. I received clear instructions beforehand, and the results arrived promptly by email too. Very satisfied!
ElineVerified
“Good communication”
This company responds to questions thoroughly and promptly. The entire process, from requesting the test to having blood drawn and receiving the results, runs very smoothly. Overall, I am very satisfied!
Jacques QuipèreVerified
“Wide choice of tests, fast and affordable”
You can choose the tests yourself. Fast delivery and processing, clear instructions and affordable.
SMVerified
“I am satisfied with the service”
I received a referral by email, just like from a GP. I did not have to send anything by post and could quickly visit a local blood collection centre. The results were fast and clear. The price was good, not too expensive, and all messages were secure.
kraljicaVerified
“A very good experience”
A very good experience! I received quick answers to my questions, a custom blood test was put together, everything was arranged smoothly, and I could have my blood drawn by a healthcare professional nearby. The results were available within a few days. In short, very satisfied!
PhilVerified
“Very good customer service”
The customer service is very good. I had a complex request, which caused an issue at the blood collection centre. Customer service resolved it very well. They also offer a wide range of tests at a reasonable price.
Marc EekhoutVerified
“Everything was well organised”
Everything was well organised. The products were delivered within a few days and, after sending in the samples, the results arrived within a few days too. Communication and information throughout the process were clear and friendly.
martijnVerified
“Fantastic service”
Fantastic service! Very good customer service that responds quickly and thinks along with you. Good prices. I will definitely use BloedCheckup's services again.
kambalesVerified
“Very happy to have found this business”
Very happy to have found this business. We need to check our blood more often :) The process was easy. They sent me the kit at home, then I had to go to a clinic with the papers and they knew what they had to do. I got the results in less than a week.
DenisaVerified
“Smooth process and good support”
Amazing website experience. I ordered various tests for 2 people. We went to one of the supported centers and took samples. Also after the results were ready, I needed a letter from the laboratory and they prepared the letter for me in no time. Definitely recommended.
Majid HajiheidariVerified
“Amazing service!”
Received a packet with everything needed, went to a walk in clinic (Amsterdam DC Clinic) where my blood was drawn and I was out the door within 5 minutes, and then after posting the samples, received results 2 days later. Results were easy to understand as well. Amazing service, would highly recommend!
Trudi CoetzeeVerified
“Great customer service”
I ordered a test through bloedcheckup.nl but later realized I no longer needed it. I contacted their support team, and they were very quick, responsive, and helpful in handling my cancellation. The whole process was smooth and efficient. Great customer service!
Elif Göksu BecerikVerified