Testing Service for Vitamin D to the Public

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

  • We are one of the largest NHS Vitamin D testing laboratories and have been  offering Vitamin D tests to the public since 2011.

  • Test packs sent around the world. Bulk orders discounted for professional use with multiples of 10 kits packs available below.

  • Payments - At checkout click PayPal then pay with PayPal or use your credit/debit card option in PayPal. Do not complete the form under OR as it does not complete a sale.

How much does it cost? £28 to UK, £33 Europe and £34 to Rest of the World.

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

Results: Sent to the email address provided on the consent form. If you 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 USA.

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 if you can for the best service. You can also use our telephone order line during working hours.

  • Tel: 0121 507 4278 Mon-Fri 09.00-17.00 for telephone orders and enquiries/help line

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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