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Vitamin D: A Quick Review of Forms, Labs and Other Things People - adph

Vitamin D: A Quick Review of Forms, Labs and Other Things People - adph 2026

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The document, authored by Cathy Breedon, PhD, RD, CSP, FADA, provides a comprehensive overview of vitamin D, addressing its various forms, absorption factors, and the importance of adequate levels for health. It highlights the global issue of vitamin D deficiency and its association with numerous health problems. The paper discusses the differences between vitamin D2 and D3, their efficacy in supplementation, and the significance of regular testing for 25-hydroxyvitamin D levels to ensure adequate intake. Additionally, it emphasizes the need for higher supplementation doses than currently recommended to achieve optimal health outcomes.

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Click ‘Get Form’ to open it in the editor.
Begin by reviewing the introductory section that outlines the importance of vitamin D. This will provide context for the information you will be filling out.
Proceed to the sections detailing different forms of vitamin D. Use text boxes to input any relevant notes or questions you may have regarding Cholecalciferol (D3) and Ergocalciferol (D2).
In the lab values section, ensure you enter any specific results related to 25-hydroxycholecalciferol and 1,25-dihydroxycholecalciferol as applicable. This is crucial for tracking vitamin D levels.
Utilize checkboxes or dropdowns where available to indicate your understanding of absorption factors and supplementation regimens discussed in the document.
Finally, review all entries for accuracy before saving or sharing your completed form. Our platform allows easy export options for distribution.

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What is the normal range for vitamin D?

The normal range of 25-hydroxy vitamin D is measured as nanograms per milliliter (ng/mL) or nanomoles/liter (nmol/L). Many experts recommend a level from 20 and 40 ng/mL or 60 and 100 nmol/L. Others recommend a level from 30 to 50 ng/mL (75 to 125 nmol/L).

What does vitamin D show as on bloodwork?

Before your body can use vitamin D, your liver must change it into another form called 25 hydroxyvitamin D, or 25(OH)D. Most vitamin D blood tests measure the level of 25(OH)D in your blood because thats the most accurate way to see if you have enough vitamin D.

What is another name for a vitamin D test?

The amount of 25-hydroxyvitamin D in your blood is a good indication of how much vitamin D your body has. The test can determine if your vitamin D levels are too high or too low. The test is also known as the 25-OH vitamin D test and the calcidiol 25-hydroxycholecalcifoerol test.

What is vitamin D lab test for?

A vitamin D test measures the levels of vitamin D in your blood. Vitamin D helps your body absorb calcium to build healthy bones and teeth. It also helps keep your muscles, nerves, and immune system working normally.

What is the best form of vitamin D to take as a supplement?

Two forms of vitamin D are available in supplements: vitamin D3 and vitamin D2. Both can help correct vitamin D deficiency, but most doctors recommend D3 because it is slightly more active and therefore slightly more effective. Vitamin D3 is naturally produced by animals, including humans. Vitamin D2 is the plant form.

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