Vitamin D, 25 Hydroxy (25-OH), Total
This is the best test for measuring vitamin D status. Vitamin D is essential for bone health, immune function, and mood. Deficiency is extremely common, especially in regions with limited sun exposure.
12 hours
Turnaround
Blood
Sample
What the Vitamin D, 25 Hydroxy (25-OH), Total test tells you
Vitamin D behaves less like a vitamin and more like a hormone. Skin makes it when ultraviolet light reaches it, and a smaller amount comes from oily fish, egg yolk and fortified foods. Whatever the source, the liver converts it into 25-hydroxyvitamin D, the form that circulates in meaningful quantities and lasts long enough to be measured reliably. This is what the test reports. The kidneys later activate a small portion on demand, but that active form is so tightly regulated and so short-lived that it says little about how much vitamin D a person actually has.
The best-understood role of vitamin D is in calcium handling. It helps the gut absorb calcium and phosphate and, working with parathyroid hormone, keeps bone mineralisation on track. A prolonged shortfall softens bone, causing rickets in children and osteomalacia in adults, and contributes to bone loss, muscle weakness and falls later in life. Receptors for the active form also sit in immune and muscle tissue, which is why low levels have been linked with a wider set of symptoms, although the strength of those links varies a great deal from one association to the next.
Deficiency is common in the UAE despite the climate, because sunlight only helps when it actually lands on skin. Indoor working hours, air-conditioned routines, clothing that covers the body, consistent sunscreen use and deeper skin pigmentation all reduce how much the skin makes. Doctors order the test for bone or muscle pain, unexplained tiredness, an unexpected calcium or alkaline phosphatase result, before and during treatment for thinning bones, and for people with malabsorption, obesity, kidney or liver disease, or medicines that speed up vitamin D breakdown. Because the level moves slowly, repeat testing is usually spaced out rather than frequent.
Recommended for general health screening, bone pain, muscle weakness, fatigue, depression, frequent infections, and for individuals with limited sun exposure.
Aching bones, weakness in the thighs and shoulders, and difficulty rising from a chair are among the most recognisable reasons to measure vitamin D.
Indoor routines, covering clothing, consistent sunscreen use and deeper pigmentation all reduce how much vitamin D the skin can produce.
Vitamin D is assessed before and during treatment for thinning bones, and after a fracture that seems out of proportion to the injury that caused it.
Coeliac disease, inflammatory bowel disease and weight-loss surgery all limit uptake of this fat-soluble vitamin, so status is checked periodically.
Reasons your doctor may request the Vitamin D, 25 Hydroxy (25-OH), Total test
Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.
Bone pain & muscle weakness
Persistent bone pain, muscle aching or weakness, particularly around the hips and shoulders.
Bone thinning & abnormal bone chemistry
An unexpected calcium, phosphate or alkaline phosphatase result that needs explaining.
Thinning bones on a scan, or a fracture that happened with very little force.
Sun exposure, absorption & medication
Very limited sun exposure through indoor routines, covering clothing or consistent sunscreen use.
Malabsorption from coeliac disease, inflammatory bowel disease or weight-loss surgery.
Long-term use of medicines that accelerate vitamin D breakdown, such as some anti-epileptic drugs and steroids.
No fasting window — pick any slot that suits you, online or on WhatsApp.
A DHA-licensed nurse collects your sample at home or in the office — free home collection.
A physician-reviewed, easy-to-read report lands securely by WhatsApp and email.
Vitamin D supports bone health and immunity. Many people in the region run low.
Ranges are a guide — your physician interprets your result alongside your symptoms and history.
What a higher result can point to
- Taking high-potency vitamin D supplements for longer than intended, or continuing a loading course past the point it should have stopped.
- Combining several products at once, such as a multivitamin, a separate vitamin D capsule, cod liver oil and fortified foods.
- Mistakes in strength or dosing frequency, which are the usual cause of genuinely excessive levels.
- An injection or a single large oral dose given shortly before the sample was collected.
What a lower result can point to
- Little skin exposure to sunlight, whether from indoor routines, covering clothing or regular sunscreen use.
- Deeper skin pigmentation, which slows production for the same amount of sunlight.
- Obesity, where vitamin D is taken up and held in fat tissue rather than circulating.
- Malabsorption from coeliac disease, inflammatory bowel disease, pancreatic insufficiency or weight-loss surgery.
- Medicines that speed up its breakdown in the liver, including several anti-epileptic drugs and long-term steroids.
- Advanced kidney or liver disease, which disturbs the steps that convert and retain it.
These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests — your doctor decides what it means for you.
What this test cannot tell you
- The test reflects overall vitamin D supply, not how well the active hormone is working; in liver disease, pregnancy or low protein states the carrier protein shifts and the total can mislead.
- Laboratory methods do not always agree exactly with one another, so it is better to follow the trend at a single laboratory than to compare results from different providers.
- The level changes slowly with sun exposure and season, so one measurement describes the preceding months rather than that day.
- Low vitamin D is common, and finding it does not by itself explain symptoms such as fatigue; other causes still deserve consideration.
Risks of the blood draw
- Mild bruising or brief soreness where the needle went in.
- Occasional lightheadedness, which settles after a few minutes of rest.
- Bleeding or infection at the site, which is rare with sterile single-use equipment.
- 125-hydroxyvitamin D is the storage form and the most reliable indicator of vitamin D status.
- 2Skin production needs sunlight to actually reach skin, so a sunny climate is no guarantee of sufficiency.
- 3Vitamin D governs calcium and phosphate absorption and is central to bone strength and muscle function.
- 4The active form is not used for status testing because the body regulates it too tightly and it clears too fast.
- 5Levels move slowly, so your doctor will usually leave a gap of several months before rechecking.
Frequently Asked Questions
Everything you need to know about the Vitamin D, 25 Hydroxy (25-OH), Total test. Can't find what you're looking for?
Talk to our team→Sunlight only helps when ultraviolet light reaches bare skin. Indoor working hours, air-conditioned routines, clothing that covers the body, consistent sunscreen use and deeper pigmentation all reduce production, and in a very hot climate people spend less time outdoors, not more. Low vitamin D is common in the UAE for exactly these reasons.
The active form is produced on demand, regulated tightly by the body and cleared quickly, so it can look perfectly normal even when stores are depleted. 25-hydroxyvitamin D circulates far longer and reflects the combined contribution of sunlight, diet and supplements, which makes it the better measure of status.
Vitamin D accumulates slowly, so a recheck too early tends to be uninformative. Doctors generally allow several months of consistent dosing before repeating the test, and space later checks further apart once the level is stable.
No. It acts as part of a system with calcium, phosphate, magnesium and parathyroid hormone. Magnesium is needed for the enzymes that convert vitamin D into its usable forms, and calcium intake determines whether the vitamin has anything to work with, which is why these are often measured together.
This is the best test for measuring vitamin D status. Vitamin D is essential for bone health, immune function, and mood. Deficiency is extremely common, especially in regions with limited sun exposure.
Recommended for general health screening, bone pain, muscle weakness, fatigue, depression, frequent infections, and for individuals with limited sun exposure.
No, fasting is not required for the 25-Hydroxyvitamin D test, so you can eat and drink normally beforehand.
The 25-Hydroxyvitamin D test uses a blood sample, collected quickly by our DHA-licensed phlebotomist with minimal discomfort.
Results for the 25-Hydroxyvitamin D test are typically ready within 12 hours. You will receive a secure digital report, and your Smart Report highlights anything outside the normal range.
The 25-Hydroxyvitamin D test is AED 219, which includes free home sample collection and a physician-reviewed report. You can also build a custom panel and pay only for the markers you choose.
Yes. A DHA-licensed phlebotomist can collect your sample at home or the office anywhere in Dubai at no extra cost, 7 days a week. See how it works.
It is commonly chosen by all ages. If you are not sure it is right for you, our care team is happy to advise.
Add the 25-Hydroxyvitamin D test to your cart and complete the short booking wizard, choosing home collection or a lab visit. Guest checkout lets you book without creating an account.
Yes. It is processed at our EIAC-accredited laboratory (ISO 15189:2022) under DHA license 0046381 and verified by board-certified pathologists.
Every report includes reference ranges and plain-language notes. If you have questions, our care team can arrange a clinician review — just get in touch.
Absolutely. Add it to a curated health package or bundle it with any of our 160+ biomarkers, often from a single sample in one visit.