Testing Service for 25-hydroxy Vitamin D2 and D3

We offer a home test kit for Vitamin D using dried blood spot technology. This work is performed in our NHS Vitamin D laboratory that also offers a national Vitamin D service for the NHS in the United Kingdom.

Using Our Service

  • Request a collection kit by phone using a debit or credit card at the time you order
  • Kits are sent to you by first class post or Airmail
  • Follow the simple instructions and send back using the pre-paid envelope supplied (overseas users need to affix air mail postage)
  • We aim to send you results within 5 working days from the time we receive your sample
  • You receive results as a pdf attached to an email with a clear interpretation. See example report here.....

vitamin d test

How much does it cost?

  • Orders for kits after 1st July 2014: £28 to UK/Ireland                                                       £30 

  •                                                      £33 Overseas

  • Bulk Orders : We offer a discount for orders of 10 or more kits, paid by credit/debit card at the time of order (£23 UK/Ireland and £28 Overseas).

What do we measure?

We use liquid chromatography mass spectrometry method to measure the Vitamin D in your blood. We measure Vitamin D2 and D3. We report the Total and D2 and D3 results with a clear interpretation.


Results are sent to the email address provided on the consent form. If you would prefer, we can post results to you.

Our result form has a clear interpretation of your Vitamin D level. Note that our results are expressed as nmol/L. See our Questions and Answers page for how to convert nmol/L to ng/mL which are the older units still used in the US and some laboratories in the UK.


We have a questions and answers area on our website where many of the recent queries from the public are answered. See here.....

We have some Internet links on our "Further Info" page to sites that look in more details at the issues around Vitamin D, focusing in particular on the United Kingdom. See here......

Continuous Quality Improvement

The process of continuous quality improvement in all aspects of our service is key to all we do. We welcome feedback on any aspect of this website and our Vitamin D Blood Spot Service.

You can contact us at: vitd@cityassays.org.uk

















@cityassays You can now follow us on twitter    @Cityassays

As from the 1st July 2014 our kit price will be increased to:

£28  UK/Ireland

£33 Overseas

Postal Delays......

We have been investigating problems with delays in the postal system. There has been several reasons for this, which we hope are now rectified.


Blood Spot Test Kit Order Line

Tel: +44 (0)121 507 4278

Monday - Friday 09.00 - 17.00 UK time

  • Please have a debit/credit card available when you call
  • You can order single or multiple packs
  • Standard prices from 1st July 2014 will be £28 UK and £33 overseas.

Blood SpotTest

   vitamin d test

vitamin d test