
Vitamin D Deficiency Test & IV Therapy in London
By Mr. Tharb Faisl & Dr. Caplin Merijo
Do you constantly feel fatigued, struggle with low energy, or suffer from frequent colds? These are common symptoms of vitamin D deficiency. If you’ve been feeling “off” or dealing with unexplained aches, it may be time for a vitamin D deficiency test.
At Marylebone Diagnostic Centre, we offer a vitamin D deficiency test in central London, designed to detect low vitamin D levels in just a few minutes. We also provide high-dose vitamin D IV therapy for fast relief, helping you restore your vitamin D levels and improve energy, mood, and immunity.
What Are the Symptoms of Vitamin D Deficiency?
If you are experiencing any of the following symptoms, it could be a sign of vitamin D deficiency:
- Constant fatigue or weakness
- Low mood, seasonal depression (SAD)
- Muscle aches or joint pain
- Frequent infections or slow healing
- Hair thinning
- Brain fog or poor concentration
- Weak bones or fractures
Many people who experience these symptoms have never considered a vitamin D deficiency test. Vitamin D deficiency is common in the UK, especially during the colder months when sunlight exposure is limited. It’s important to get tested so you can treat it before it leads to more serious health issues.
What’s Included in a Vitamin D Deficiency Test?
Our vitamin D deficiency test includes a measurement of your 25-Hydroxy Vitamin D (25(OH)D) level, the best indicator of your body’s vitamin D status. You can also choose to have additional tests, such as:
- Calcium levels
- Phosphate levels
- Parathyroid Hormone for bone health
- Full Blood Count or Nutrient Panel add-ons
Our results are fast—usually available in 1–2 working days—and we explain everything clearly, with no jargon.

Book Your Vitamin D Test at Marylebone Diagnostic Centre
Vitamin D IV Therapy – The Fastest Way to Restore Your Levels
Once your vitamin D deficiency test confirms low vitamin D levels, we offer vitamin D IV therapy for rapid replenishment. Our high-strength vitamin D IV therapy is perfect for those who struggle with vitamin D absorption through oral supplements.
Here’s why our vitamin D IV therapy stands out:
- Rapid absorption for quick results
- Ideal for vegans, people with darker skin tones, or those with limited sun exposure
- Medical-grade treatment, personalized for your needs
- Treatment takes just 20–30 minutes
Many of our clients have already seen significant improvements after a single session of vitamin D IV therapy.
Why Choose Marylebone Diagnostic Centre for Your Vitamin D Test?
- Same-day testing and IV therapy slots available
- Convenient location near Baker Street, central London
- Fully private, doctor-led care in a calm and professional environment
- 100% confidential—no GP referral required
At Marylebone Diagnostic Centre, we make it easy to test and treat your vitamin D deficiency in one visit. Whether you’re feeling fatigued, experiencing low mood, or dealing with other symptoms of deficiency, we provide a solution that’s fast, reliable, and tailored to your needs.
Real FAQs About Vitamin D Deficiency and Treatment
Q: Is vitamin D deficiency serious?
A: Yes—vitamin D deficiency can impact your mood, immune function, bone strength, and more. If left untreated, it could lead to more severe health complications.
Q: Can I just take vitamin D tablets?
A: Oral supplements can help, but if you have absorption issues, vitamin D IV therapy offers a quicker, more effective solution.
Q: Do I need to fast before the test?
A: No, no fasting is required for the vitamin D deficiency test.
Book Your Vitamin D Test and IV Therapy Today
If you’re experiencing any of the symptoms of vitamin D deficiency, don’t leave your health to chance. Test it, treat it, and feel the difference in just a few days.
Book online now at marylebonediagnosticcentre.com or call us at +44 7495 970109.