Vitamin D (25HDN)

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25HDN, or 25-Hydroxyvitamin D2 and D3, S is a test to help evaluate risk factors associated with vitamin D deficiency. It is also useful as a tool to determine the causes of rickets and osteomalacia (softening of the bones), to monitor Vitamin D levels during replacement therapy, and to diagnose hypervitaminosis D, also called vitamin D toxicity. 25HDN is a simple blood test.


Who Is It For?

Vitamin D testing is recommended for:

  • Anyone concerned about their well-being, health, and vitamin D levels
  • Those who suffer from Seasonal Affective Disorder
  • Anyone who receives treatment or therapy for osteoporosis and other bone disorders
  • Elderly people, particularly those with insufficient exposure to sunlight 
  • People with a diagnosis or signs of hypocalcemia or hypercalcemia (too much or too little calcium)
  • Anyone suffering from rickets and osteomalacia 
  • Patients receiving vitamin D therapy who don’t show signs of improvement
  • Children who frequently get sick
Why Is It Important?

Vitamin D is a nutrient our bodies need to stay healthy. It keeps our bones strong, aids in calcium absorption, and regulates the function of the parathyroid gland.

Insufficient vitamin D levels can cause:

  • Loss of bone density
  • Increased susceptibility to viral infections
  • Rickets, osteomalacia, osteoporosis and other bone diseases

There is also evidence that may indicate that vitamin D deficiency can contribute to diabetes, high blood pressure, cancer, and autoimmune conditions such as multiple sclerosis.

Standard and Advanced Testing Services

Health Today delivers the same level of excellence in care and reliable results for our general lab work and our enhanced screening clients. Here are the lab tests currently offered by our collections and lab services team.

What Our Clients Have To Say

We are proud of the important work we do and the impact that fast, convenient, and private lab testing services can have on the health and wellbeing of our community. We are even more proud that you don’t have to take our word for it. Here is what our clients have to say about their experience with Health Today Health:


We offer a hybrid model of general blood work and public lab services with access to enhanced, private testing. This means that Health Today Health is positioned to provide quick, efficient, and reliable tests when your physician requires, but that we can also offer you access to tools that can provide a more advanced insight into your overall health and wellness. Here is what we offer:

On Demand Private Lab Services Across Canada

From our home bases in Calgary, Edmonton, Fort McMurray, Red Deer, Medicine Hat, and Toronto, Health Today Health provides affordable, safe, and reliable in-clinic, mobile, corporate, and pop up clinic advanced lab services to people across Canada. Visit our city links to learn more about our locations and the services offered.

Calgary - Future Smiles Denture Clinic (North)

Calgary - Future Smiles Denture Clinic (North)

23 Coral Springs Blvd NE
Calgary, AB T3J 4J1
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Calgary - Health Today Inc. (Centre 70)

Calgary - Health Today Inc. (Centre 70)

7015 Macleod Trail SW, Suite 113
Calgary, AB T2H 2K6
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Toronto - Mobile / In Home Lab Services

Toronto - Mobile / In Home Lab Services

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Health, Allergy, & Cancer Testing
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Appointments can be booked here.

Please reach out to our customer services team by emailing using the contact form at the bottom of the page with your full name, test service, date and location of testing and we will help answer your questions or direct you to further information.

If you require a specific test that isn’t on our website, we may be able to offer it to you, as long as it’s tested through a blood draw. Please email our support team using the contact form below with details of the required test. It may take a few weeks until we can quote a price for you, but we will do our best.

Your Partner In Optimal Health

Your Partner In Optimal Health

Health today is committed to providing the highest level of service to our in-clinic, mobile, corporate, and rural lab service clients across Canada. We promise to continue to provide advanced solutions for testing and overall health. We will be here whenever you need lab services, wherever you need them.

Choose Health Today as your partner in achieving better health. Call 1-403-800-9273 or contact us online.

Tomorrow’s Advances In Health Screening Available Today

Health Today leverages valued partnerships with global testing technology partners to bring Canadians advanced screening tools to aid in achieving optimal health and wellness. Offered alongside excellence in delivering standard lab services, these breakthrough technologies position Health Today to be every Canadian’s best option for health testing and screening.

Use the form below for more information about our in-clinic, and pop up labs services.

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