normal vitamin d level

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Plain Dealer ExtraPlain Dealer Extra Medical »

What's normal or healthy for vitamin D levels?
==============================================

By Brie Zeltner, The Plain Dealer

February 22, 2010, 2:31PM

What's normal?

If you decide to get your vitamin D level tested, you'll likely find
that labs and physicians define a normal or "healthy" level of the
vitamin differently.

That's because the research just isn't strong enough to establish a
consensus about how much of the vitamin we need circulating in our
bodies to remain healthy.

The Cleveland Clinic, which does its own vitamin D testing, defines
deficiency as a blood level below 30 nanograms per milliliter. Some
labs put this level as low as 7 nanograms per milliliter, which the
Clinic defines as "undetectable."

The same applies for the category of "insufficiency," or borderline
deficiency, which can range from 15 to 30 nanograms per milliliter
depending on the lab.

While there may be a lot of confusion about the cutoff for deficiency,
most researchers agree that blood levels above 30 are desirable, said
Bruce Hollis, a nutritional biochemist at the Medical University of
South Carolina who has been studying the vitamin for several decades.

He aims to keep his own vitamin D level between 50 to 80 nanograms per
milliliter (he needs a supplement of about 4,000 IU a day most of the
year to do that). To put that in perspective, a person who has an
outdoor job in Florida and is exposed to the sun most of the day would
naturally have a blood level around 100 nanograms per milliliter in
the summer without any supplementation, he said.

At this time of year, someone with a desk job in Cleveland who takes
no supplements probably has a vitamin D blood level of around 15.

"That's not deficient enough to get rickets, but a lot of data are
suggesting it's not enough to satisfy the other tissue requirements
your body has," Hollis said.

--Brie Zeltner

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