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
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
- Receive your results digitally by email
What is HOLO-TC?
Holotranscobalamin (HOLO-TC) is a biomarker that measures the amount of vitamin B12 in the body that is directly available for cellular uptake. It is an early indicator of vitamin B12 deficiency, as it only reflects the portion of vitamin B12 that can be actively used by the body.
Why should you have HOLO-TC tested?
Testing HOLO-TC is useful for people experiencing symptoms that may indicate a vitamin B12 deficiency, such as fatigue, weakness, memory problems, or neurological changes. It is also valuable for individuals at risk of vitamin B12 deficiency, such as the elderly, vegans, and people with certain stomach conditions or who use specific medications.
What does it indicate?
HOLO-TC levels indicate the amount of immediately available vitamin B12 in the blood. This helps determine whether the body has sufficient vitamin B12 for essential functions such as DNA synthesis, blood cell production, and nerve maintenance.
What does a high HOLO-TC level mean?
A high level of HOLO-TC is generally uncommon and is less frequently associated with health problems. However, in rare cases, it can indicate certain medical conditions or the use of vitamin B12 supplements.
What does a low HOLO-TC level mean?
A low level of HOLO-TC indicates a deficiency of available vitamin B12 in the body. This can lead to various health problems, including anemia, nerve damage, fatigue, and cognitive impairments.
Frequently asked questions
Answers to what people usually want to know.
How does it work from order to result?
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.
How quickly can I get tested?
Usually very quickly. Collection points typically have slots within a few days, sometimes even same-day. It depends on how busy the location is. For a few specialist analyses we first ship collection materials, which takes a bit longer.
Do I need to book an appointment?
At most collection points yes. Some accept walk-ins. This is clearly indicated per location. You choose the location that works best for you.
