Bio LabVitamin D
Reviewed by Dr. Sanaa Ghoneim, Medical laboratory specialist 21 October 2026
Home sample collection is available for this test
Ask about this test on WhatsAppWhat it measures
The vitamin D test measures the form in which vitamin D is stored in the blood, called 25-hydroxy vitamin D. Vitamin D helps the body absorb calcium and supports healthy bones and muscles. Your skin makes it in sunlight, and it also comes from some foods and supplements.
Why a doctor may order it
- Symptoms such as bone pain, muscle weakness or ongoing tiredness, when your doctor wants to check your level.
- Little sun exposure, for example if you spend most of your time indoors.
- A condition that affects the bones, such as osteoporosis, or a problem that affects absorption.
- Follow-up of your level during treatment with supplements.
Preparation and fasting
A vitamin D test usually needs no fasting, unless other tests taken at the same time do.
- Tell us if you take vitamin D or other vitamin supplements, and keep taking them as your doctor advised.
We confirm the preparation with you on WhatsApp before your appointment.
Sample type
A blood sample from a vein, usually in your arm. Our technician takes it at your home.
About your results
Your results reach you on WhatsApp. Discuss them with the doctor who ordered the test, who can explain them in light of your health.