Testing Service for Vitamin D

  • Home test kits for 25-hydroxy Vitamin D measurement using finger prick samples.

  • Test packs sent around the world.

  • Bulk orders discounted for professional use - order below for packs of 10 kits.

  • Order online below - paying by bank card or PayPal. Orders placed over the weekend are sent out promptly on Monday morning.


How much does it cost?

  •  £28 to UK post FREE, £33 Europe and £34 to Rest of the World including postage. Overseas orders are sent by airmail.

What do we measure?: We use LC-MS/MS methods to measure Vitamin D in your blood. We report total and D2 and D3 levels together with a clear interpretation. Our blood spot results correlate with results on serum.

Results: Sent 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. 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.

Continuous Quality Improvement: The process of continuous quality improvement is key to all we do. We welcome feedback on any aspect of our Vitamin D Blood Spot Service. Our laboratory has been accredited by CPA for many years and has recently been assessed by UKAS to the ISO 15189 standards.

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


Ordering a Test Kit - Order online or use our telephone order line below.

  • Tel: +44 (0)121 507 4278 Mon-Fri 09.00-17.00 UK time. Telephone orders and enquiries/help line

  • NHS laboratory - one of the largest UK Vitamin D labs with direct to public service since July 2011.

Video demonstrating how to do the test:




 How it Works

  • Return sample in envelope supplied
  • Results usually returned within 5 working days from sample receipt. Sent as an email with clear interpretation. Example report here.....
  • Please note we can not give refunds for kits that have been sent to you.
  • International orders are sent by air mail.


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