Vitamin D Test (post-away)

If testing services aren't available close to you, you can simply collect your own fingerprick blood sample and post it to the lab (based in the UK - so you will have a small postal charge). We will e-mail you your results and some advice on using them 1-2 weeks after posting. Follow-up questions are welcome!

25-hydroxyvitamin D is the standard test of Vitamin D status. There is still some debate about the ideal level but there are a few pointers:

  1. Traditional hunter-gatherer populations in either the tropics or within the Arctic Circle regularly had/have levels of between 100 and 140 nmol/L. In the one case, their Vitamin D is derived from the sun, in the other it's from their diet.
  2. Outdoor workers in Northern Europe can also readily attain these levels in summer
  3. Indoor workers and those using modern skin-care workers (which contain sunblock) struggle to reach these traditional levels
  4. A level of 25 nmol/L or lower is considered Deficient
  5. A level of 25-74 nmol/L is considered Insufficient (some hospitals/regions still use a level of 50 nmol/L as Sufficient)
  6. Optimum calcium absorption capacity is also considered to occur when Vitamin D levels are close to 80nmol/L
  7. It is advised to first learn your level, then adapt diet and supplementation to reach your target goal in 12 weeks
  8. After 12 weeks of supplementation, re-test to see that the dose has had the desired effect
  9. High body-fat or inflamatory states may require a 2-3 fold higher dose of Vitamin D
  10. Always seek to include natural sources of Vitamin D in your diet to ensure the natural co-factors that help Vitamin D do its job are also available. In other words, don't solely rely on a tablet or capsule.

Wedon't charge shipping with this test as you will have to pay at the Post Office when you post away your blood sample. The kit includes the lancet (finger-stabber!) you will need to draw the required droplets of blood.