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Reference Guide
Doctor's Data
Vitamin D (25OH D2 & D3)

Vitamin D (25OH D2 & D3)

Doctor's Data
Vitamin D (25OH D2 & D3)
Doctor's Data
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Vitamin D (25OH D2 & D3)
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About the Test

25-Hydroxyvitamin D, plays a key role in bone health, calcium absorption, immune function, neurodegenerative and cardiovascular issues, and other conditions. This profile uses the gold standard LC/MS QQQ method to measure Vitamin D2, D3 and total Vitamin D. This is the serum version of the test. It is also available as a blood spot.

Ordering the Vitamin D, 25-OH D2 & D3 Test From Doctors Data

A vitamin D test measures the level of vitamin D in the blood. This vitamin is essential for healthy bones and teeth as its biological function is to maintain normal calcium and phosphorus absorption levels. It also helps keep nerves, muscles, and the immune system working properly.

Low vitamin D levels can lead to bone disorders and other medical issues.

Vitamin D can be obtained in three ways.

  • The body produces vitamin D when bare skin is exposed to sunlight
  • Vitamin D can also be absorbed from certain foods
  • Vitamin D supplements can increase the levels in the blood

There are 2 Different Types of Vitamin D Tests:

Both forms of vitamin D (ergocalciferol and cholecalciferol) work similarly in the body.

  • Most vitamin D tests measure the level of 25(OH)D in the blood. 25 hydroxy vitamin D3 (cholecalciferol) is the vitamin D the body produces or absorbs from an animal source or a cholecalciferol supplement.
  • 25 hydroxy vitamin D2 (ergocalciferol) can be measured. This vitamin D is absorbed from foods fortified with plant vitamin D or an ergocalciferol supplement.

Vitamin D Levels

Which Patients is the Vitamin D, 25-OH D2 & D3 Test From Doctors Data Best Used For?

A vitamin D test is used to screen for vitamin D levels in the blood. If the levels are low, an individual can be treated with supplements before it causes health disorders.

Those who are at high risk of having low levels of vitamin D include:

  • Lack of skin exposure to sunlight
  • Older adults
  • People with obesity
  • Babies who are breastfed only (formula is usually fortified with vitamin D)
  • People who have had gastric bypass surgery
  • People who have a disease that affects the intestines and makes it difficult for the body to absorb nutrients, such as Crohn’s disease
  • Lack of enough vitamin D in the diet
  • Liver and kidney disorders
  • Use of certain medications

About the Test

Vitamin D is an essential nutrient for human health, occurring in two forms - D3, which comes from animal sources and sun exposure, and D2, which comes from vegetable sources. Doctor's Data uses the LC/MS QQQ method to measure Vitamin D2, D3, and total Vitamin D. This is the serum version of the test. It is also available as a blood spot.

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25-Hydroxy Vitamin D
25-Hydroxy Vitamin D
25-Hydroxy Vitamin D2
25-Hydroxy Vitamin D2
25-Hydroxy Vitamin D3
25-Hydroxy Vitamin D3
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Lab Test Information
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Lab Company
Doctor's Data
Sample Type
Shipping Time
3 - 5 days
Turnaround Time
8 days
Test Preparation Starts
Up to 3 days before collection
Number of Collection Days
1 day
Methods Used For Processing
Lab Certifications
CLIA Certified
CAP Accredited
ISO 15189
COLA Accredited
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