Vitamin d2 & d3

This is an important test that is typically used to investigate vitamin D deficiency or excessive supplementation

Venous blood
2 tests included
16 days turnaround



About Vitamin d2 & d3

What is vitamin D?

Vitamin D is a fat-soluble vitamin with an important role in aiding the absorption of calcium, magnesium and phosphates. It also contributes to bone and musculoskeletal health. Vitamin D is acquired by the body in two different ways; dietary vitamin D is consumed in food and supplements and is in the form of vitamin D2 from plant sources and D3 from animal sources. Vitamin D3 is also produced by the skin in response to exposure to sunlight, which is the primary source of vitamin D for the body, making up around 80-90% of the total vitamin D. In the UK, the sun is only powerful enough to stimulate vitamin D production in the skin between around April and September. Due to the fact that this is the primary source of vitamin D in the body, it is common for vitamin D deficiency to occur in many parts of the UK during the winter months without supplements. Vitamin D deficiency can result in weakness in bones and muscles and has been associated with asthma in children and cognitive impairment in adults. Excess vitamin D through supplementation can lead to hypercalcemia.

Why take the test?

This test measures the levels of vitamin D in the blood. It is typically used to investigate vitamin D deficiency or excessive supplementation. Vitamin D deficiency can be the result of insufficient intake and production or problems absorbing the vitamin.


What's tested


How it works



Purchase your Kit

Just order a test online and get your kit delivered right to your door unless you are ordering a COVID-19 Fit to Fly test where you will be given appointment options to attend our clinics across the United Kingdom for a nose and throat swab PCR test at the checkout stage.



Take your test and post

Follow our simple instructions to take your sample and post back the enclosed prepaid envelope to our accredited lab for processing. We also offer home or workplace visits by a qualified nurse. For COVID-19 Fit to Fly tests you must attend one of our partner clinics for our trained collection officers to take your sample. You will then have the results emailed to you.



Get results directly to your dashboard

You will receive an email notification from our medical team when your results are available on your secure personalised health dashboard.