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Vitamin D colour-reference screening

FREE rapid Vitamin D deficiency screening at home

A finger-prick blood test that estimates your Vitamin D level using a colour reference card. Read the screening result between 15 and 20 minutes without posting a sample to a laboratory.

First kit £0 · £6.99 UK delivery & handling

Extra kits £4.99 each · Maximum 4 kits per order

Available

CLAIM YOUR FREE TEST KIT Our missionHow it works
Read Vitamin D Test Kit instructions
100% Discreet DeliverySent in a plain, unmarked bubble mailer that fits through a standard letterbox. No signature is required and the contents are not identified outside.
Result looks low?This is a screening estimate. Talk to a GP or pharmacist before starting high-dose supplements, and about whether a lab blood test is needed.
Read your result at homeRead between 15 and 20 minutes; do not interpret after 20 minutes. No clinic visit and nothing to post back — everything happens in your own home.
CareFree Kits Vitamin D Test Kit with cassette and colour reference card
First kit £0.00
Discreet UK delivery
No eligibility requirements
Private at-home results

Ordering your Vitamin D test kit online

  • Your first Vitamin D kit is £0.00 — you pay £6.99 flat UK delivery and handling, shown before payment.
  • Extra kits are £4.99 each, up to 4 kits in one order.
  • Sent in plain packaging by Royal Mail Second Class to UK addresses.
  • Rapid screening test you do and read yourself at home — no lab postage or appointment needed.

Why check your Vitamin D

In the UK, sunlight is too weak for much of the year for the skin to make enough Vitamin D, which is why UK health guidance suggests many people consider a daily supplement in autumn and winter.

This kit gives you a rough estimate of your Vitamin D level by comparing a test line against a colour card. It measures Vitamin D only — not other vitamins or minerals.

The three reference bands

First check that a blue control line (C) is visible. Then compare the T line with the card supplied in your kit — the lighter the T line, the lower the estimated level.

Deficient

Below 10 ng/mL

Insufficient

10 to below 30 ng/mL

Normal range

30 ng/mL or above

Blood first, then buffer

  1. 01

    Room temperature

    Let the kit reach 10–30°C and place the cassette on a flat surface.

  2. 02

    2 drops of blood

    Add about 10 µL (2 drops) of finger-prick blood to the well marked S.

  3. 03

    3 drops of buffer

    Once the blood has soaked in, add about 90 µL (3 drops) of buffer to the same well, then read at 15–20 minutes.

Limits of a colour-card estimate

  • It is a screening estimate, not a laboratory measurement or a diagnosis.
  • Phone and computer screens change colours — always use the printed card from your kit.
  • Do not interpret the test after 20 minutes.

Questions about the Vitamin D Test Kit

Full Vitamin D Test Kit instructions

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First kit £0. £6.99 delivery & handling; £4.99 per extra kit. Maximum 4 kits per order.

CLAIM YOUR FREE TEST KIT

Rapid screening tests do not replace professional medical advice or diagnosis. Follow the instructions supplied with your kit. If you have symptoms, a recent exposure, or concerns about a result, speak to a healthcare professional.