Serum sodium; fluid and osmolality.
Blood collection at collection point
After your order you receive instructions by email
Make an appointment at a collection point near you
Blood collection at 1,000+ locations across the Netherlands
Sodium is an essential mineral that plays a crucial role in the human body, especially in regulating fluid balance and supporting nerve and muscle functions. It is primarily found in the blood and the extracellular fluid surrounding cells.
Testing sodium is important to assess the balance of electrolytes in the body and to aid in the diagnosis of conditions affecting water and salt balance, such as dehydration, kidney disease, or heart failure. It can also be useful in evaluating symptoms like fatigue, headache, confusion, and nausea, which may indicate an electrolyte imbalance.
The sodium level in the blood helps evaluate a person's hydration status and the functioning of the kidneys and adrenal glands. It also provides insight into how the body manages electrolytes, which is essential for maintaining healthy blood pressure and the proper functioning of muscles and nerves.
A high sodium level, known as hypernatremia, may indicate dehydration, certain kidney diseases, or excessive salt intake. It can also be associated with conditions that affect the body's water balance, thus increasing the risk of hypertension and heart disease.
A low sodium level, or hyponatremia, may indicate overhydration, kidney failure, heart failure, or the use of certain medications. It can also cause symptoms such as fatigue, confusion, headache, and in severe cases, seizures.
This test is included in Dutch healthcare guidelines and is regularly used for its respective indications.
Rationale for this test
Natrium is een standaard-bepaling in de Nederlandse eerstelijnszorg en wordt opgenomen in meerdere NHG-richtlijnen voor de beoordeling van elektrolytenbalans, nierfunctie en cardiovasculair risicomanagement. De test heeft een goed gedefinieerde referentiewaarde (136-145 mmol/L) en wordt gebruikt bij diverse klinische indicaties zoals hartfalen, dehydratie en bij het starten van bloeddrukmedicatie. De klinische betekenis en diagnostische waarde zijn goed onderbouwd binnen de Nederlandse reguliere geneeskunde.
Dutch clinical guidelines and healthcare organisations
We recommend consulting these independent sources before ordering a preventive health check.
Brochure on preventive health checks: careful choice, reliability, pros and cons, checklist.
Independent information about preventive health checks from the National Institute for Public Health and the Environment.
Reliable patient information about illnesses and complaints from Dutch GPs (NHG).
Public-facing website of the Dutch Society for Clinical Chemistry with explanations of blood tests and laboratory values.
Answers to what people usually want to know.
After ordering we generate a referral letter and email you the instructions. You pick a collection point yourself and book an appointment there. Blood is drawn at the location, processed at the lab, and your result arrives digitally.
Often within a few working days. How soon you can be seen depends on how busy the location is and the type of analysis. For specialist analyses we first ship collection materials, which takes a bit longer.
At most collection points yes. Some accept walk-ins. This is clearly indicated per location. You choose the location that works best for you.
That depends on the test. Whether fasting is required, and from what time, is clearly stated in the instructions you receive after ordering. No surprises at the counter.
It varies per analysis: from same-day to a few working days. Standard values often come back quickly; analyses that go to an external lab can take a bit longer. You get an email with a link to your digital result, including a short explanation per value.
We work with 1,000+ collection points across the Netherlands. After ordering you'll see which locations near you are available and you pick where you'd like to go.
Didn't find what you're looking for? Request a custom test
This is why clients choose us
“Hele fijne en snelle service”
Hele fijne en snelle service! Ik contacteerde ze ‘s nachts omdat ik zsm moest bloedprikken, ik kon die ochtend nog terecht en heb dezelfde dag mijn uitslag binnengekregen. Echt top!!
“Bloedcheckup levert”
Waar ziekenhuizen moeilijk doen om checkup te doen , komt Bloedcheckup naar boven drijven als vertrouwde partner op gebied van gezondheid. Ik ben uiterst tevreden met bloed checkup
“Klantenservice was erg behulpzaam in…”
Klantenservice was erg behulpzaam in het beantwoorden van mijn vragen. Ik had ook een extra setje buizen nodig als back-up en dat was geen probleem. Ik had een groot test panel besteld, maar de resultaten waren binnen 1 week binnen. Rapport zag er netjes uit.
“Snelle en goede service”
Je hebt de spullen snel in huis en het is duidelijk wat je daarna moet doen. Ook de uitslag heb je snel in huis, ik dezelfde avond al de eerste uitslagen. Bij een bepaling ging het fout, niet eens door het bedrijf maar door het bloedafname punt en die bepaling kreeg ik gewoon vergoed, ook het geld terug stond erg snel op mijn rekening. Vragen worden ook snel beantwoord dus al met al een positieve ervaring bij Bloedcheckup.nl
“Fijn bedrijf met geweldig veel opties…”
Fijn bedrijf met geweldig veel opties om zelfstandig je gezondheid in het oog te houden, als sporter een must want de dokters hebben toch geen verstand van wat relevant en anders is voor sport. Ook zeer tevreden over Stijn zelf! Aangename kerel en goed bereikbaar voor vragen en hulp tijdens bestellen :D
“My experience was very positive”
My experience was very positive. I needed to pass several very specific tests. They provide 24/7 customer support. They were friendly and prompt.
“Top!”
Snelle en makkelijke afhandeling. Duidelijke instructies en binnen anderhalve dag al resultaat binnen. Top service!
“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!
We use analytics and marketing cookies to improve the site. Read more in our privacy policy.
PostHog usage stats so we can see which pages and products work. Anonymous, BloedCheckup only. Google Ads conversions, session replays, and Shopify attribution. Helps us know which ads bring real customers.