Vitamin B12; for suspected deficiency or absorption issues.
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
Vitamin B12, also known as cobalamin, is an essential nutrient required for the production of red blood cells, DNA synthesis, and the function of the nervous system.
Testing Vitamin B12 is useful for determining if there is a deficiency or excess, which may indicate underlying health issues or the need to adjust diet or supplements. It is especially beneficial for people who follow a vegan diet, the elderly, and individuals with certain medical conditions.
Vitamin B12 levels in the blood indicate whether the body has sufficient amounts of this essential nutrient for normal functions. Abnormal levels may point to nutritional deficiencies, absorption problems, or certain diseases.
A high level of Vitamin B12 can indicate certain conditions, such as liver disease. It may also be the result of taking too many Vitamin B12 supplements.
A low level of Vitamin B12 can lead to anemia, fatigue, weakness, constipation, loss of appetite, weight loss, and neurological problems such as memory loss or tingling in the hands and feet.
This test is included in Dutch healthcare guidelines and is regularly used for its respective indications.
Rationale for this test
Vitamine B12-bepaling is een standaard-diagnosticum in Nederlandse zorgrichtlijnen. De test wordt gebruikt bij verdenking op een tekort, bijvoorbeeld bij vermoeidheid, neurologische klachten, of bij risicogroepen zoals veganisten en ouderen. De klinische betekenis en interpretatie zijn goed onderbouwd in NHG-standaarden en NVKC-adviezen.
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.
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