Vitamin D Test USA – Inactive Form – 25 Hydroxyvitamin D

  • Tests: Vitamin D 25 hydroxy – active form, Calcium-serum
  • Recommended Add-On Test: Vitamin D 25 Dihydroxy Active Form
  • Draw Locations
  • Turnaround Time: 3-5 Business Days
  • Not Available in: NY, NJ, MA, and RI
  • HSA and FSA Approved


Many parts of the world, including many parts of USA and most of Canada have an epidemic of Vitamin D Deficiency and could benefit from a vitamin d blood test,. This is especially true for those that work or go to school indoors, and during the winter months. Vitamin D despite it’s name is actually a hormone, that plays a crucial role in a range of bodily processes, including: maintaining bone health by regulating calcium absorption, immune system function, reduces the risk of multiple sclerosis and heart (cardiovascular) disease, and can help improve mood and reduce symptoms of depression. I recommend getting one test before beginning supplementation, and then one a few weeks after supplementing to ensure you are taking the correct amount of Vitamin D supplement; adjusting dose as necessary according to your test results.

Vitamin D Deficiency

As much as 80% of the population in the United States is estimated to have low vitamin-D levels. Emerging studies show that low vitamin D is associated with an increasing cause of death from ALL causes1. Low vitamin D is also associated with autoimmune diseases and overall immune health.

Recommended add-on test: Vitamin D 1,25 Dihydroxy Active Form

Vitamin D Deficiency Causes

In a society that has almost every vitamin D type food available and abundant sunshine, many are left wondering, “Why are my vitamin D levels low”? The 7 most common causes for low vitamin D levels are:

  • Misuse/overuse of sunscreen
  • Diet high in processed foods
  • Inactivity
  • Stress
  • Smoking
  • Obesity
  • Thyroid issues

Why Get Your Vitamin D Levels Checked?

This test will allow you to supplement with the correct dosage of vitamin D. Since you can overdose on vitamin D, it is recommended to be tested once a season in order to adjust supplementation and maintain optimal vitamin D levels.

Vitamin D deficiency has been shown in studies to increase the risk of:

  • Autoimmune conditions like Multiple Sclerosis and Hashimoto’s
  • Type 1 Diabetes
  • Cardiovascular Disease
  • Increased blood pressure
  • Certain cancers

Vitamin D and Breast Cancer

Studies show a close correlation between optimal vitamin D and breast cancer. Many of these studies show that optimal vitamin D levels are associated with a 50% decrease in breast cancer risk2.

What’s Being Tested | Vitamin D Blood  Test

  • Vitamin D (25 Hydroxyvitamin D- dietary indicator; inactive form)
  • Calcium Serum

Fasting: No

Specimen Type: Blood (Draw Location | How It Works | FAQs)

Turnaround time: 3-5 Business Days

Important Notes | Vitamin D Blood Test

  • This test cannot be collected in NY, NJ, MA, and RI. Contact us with questions.


1Dobnig H, et al. Independent association of low serum 25-Hydroxyvitamin D with all-cause mortality. Archives of Internal Medicine. 2008 Jun 23:168:1340-1349.

2Vitamin D and prevention of breast cancer: A pooled analysis. The Journal of Steroid Biochemistry and Molecular Biology Volume 103, Issues 3-5, March 2007, Pages 708-711


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