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Vitamin D, 25 Hydroxy Tests

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Quick Health Group, Inc., Insurance Services, Dallas, TX

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Vitamin D, 25 Hydroxy Tests

We have highly discounted rates for almost any type of blood or urine or hair or stool tests, for today's specials call:617-395-8864

Vitamin D, 25 Hydroxy Tests

Fasting Required: Fasting preferred, but not required.

Specimen: Blood

Results: 4-5 Business Days

Note: Result turn around times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.


This highly automated test measures both D2 and D3 together and reports a total 25-hydroxy.

Vitamin D is also known as the "sunshine vitamin" because the body manufactures the vitamin after being exposed to sunshine. Ten to 15 minutes of sunshine 3 times weekly is enough to produce the body's requirement of vitamin D. Needed for strong bones and teeth, Vitamin D helps your body absorb the amount of calcium it needs. It also has other roles in the body, including modulation of cell growth, neuromuscular and immune function, and reduction of inflammation. There are associations between low Vitamin D levels and peripheral vascular disease, certain cancers, multiple sclerosis, rheumatoid arthritis, juvenile diabetes, Parkinson's, and Alzheimer's disease.

Foods that are rich in Vitamin D:

  • milk fortified with vitamin D
  • fish
  • egg yolks
  • liver
  • fortified cereal

The new research strengthens the case made by some specialists that vitamin D may be a powerful cancer preventive and most people should get more of it. Experts remain split, though, on how much to take.

"The findings .. are a breakthrough of great medical and public health importance," declared Cedric Garland, a prominent vitamin D researcher at the University of California-San Diego. "No other method to prevent cancer has been identified that has such a powerful impact."

While the most reliable yet, the study does have drawbacks. It was designed mainly to monitor how calcium and vitamin D improve bone health, and the number of cancer cases overall was small, showing up in just 50 patients.

"It's a very small study," said Dr. Edward Giovannucci, who researches nutrition and cancer at the Harvard School of Public Health. "I don't think it's the last word."

In either case, the study takes an important step in extending several decades of research that began with observations that cancer rates among similar groups of people were lower in southern latitudes than in northern ones. Scientists reasoned that had to do with more direct sunlight in southern regions.

The skin makes vitamin D when exposed to sunlight's ultraviolet rays. This study used that same form of the vitamin, known as D3 or cholecalciferol. Multivitamins usually carry a much weaker variant known as D2, but D3 is available in stand-alone dietary supplements.

Earlier research has shown that vitamin D helps regulate cell growth, a fundamental biological process that goes haywire in cancer. Most other supplements have tended to target specific types of disease in early testing, like selenium or vitamin E for prostate cancer.

This study, published Friday in the American Journal of Clinical Nutrition, is the first time that researchers significantly boosted -- and measured -- blood levels of vitamin D and then followed identical groups of patients from start to finish.

That's why, despite its modest size, the research was generating excitement. Nearly all other work has compared disparate groups of patients.

The researchers at Creighton University in Omaha focused on 1,179 seemingly healthy women with an average age of 67.

The researchers intended to check mainly for the effects of calcium on bone health. Their interest in cancer risk was secondary.

But the lower cancer risk stood out. Only 13 women, or 3%, developed cancer over four years of calcium and vitamin D supplements. With calcium alone, 17 women, or 4%, got cancer. With dummy pills, cancer appeared in 20 women, or 7%.

That shows a 60% lower cancer risk over four years in the group taking both supplements, compared to patients taking placebos. And when the first-year cancers were excluded -- the ones mostly likely present before the study began -- the findings were stronger still: a 77% lower risk for the combo group.

Joan Lappe, the study's lead researcher, said it "just adds to the great bunch of evidence that we need to have better vitamin D nutrition." Some foods carry the vitamin, like salmon, tuna and fortified milk, but diet accounts for little of the vitamin circulating in the body. Overexposure to the sun can cause skin cancer.

Still, people should consult their doctors before boosting their vitamin dosage, several experts also warned.

More study is needed to determine if the effects in this study hold true for large groups of people and men as well as women.

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