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Old 04-10-2011, 05:36 AM   #1
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Can you have your Vitamin D levels tested at any time of day?

Can you have your Vitamin D levels tested at any time of day or do you have to have your blood drawn in the morning to get accurate results?

 
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Old 04-10-2011, 05:59 AM   #2
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Re: Can you have your Vitamin D levels tested at any time of day?

I forgot to ask if you have to fast before having your test done.

Thanks in advance

 
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Old 05-16-2011, 12:38 AM   #3
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Re: Can you have your Vitamin D levels tested at any time of day?

I do it in the morning, as this is the best time.

 
Old 06-13-2011, 02:45 PM   #4
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Re: Can you have your Vitamin D levels tested at any time of day?

I had my blood tested today after lunch for vitamin D. My doctor's office said it could be done at any time.
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Old 05-16-2012, 06:17 AM   #5
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Re: Can you have your Vitamin D levels tested at any time of day?

You can have your D levels done even after eating

 
Old 05-16-2012, 07:05 AM   #6
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Re: Can you have your Vitamin D levels tested at any time of day?

vitamin d doesn't require fasting and can be done at any time during the day.

 
Old 07-13-2012, 06:41 AM   #7
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Re: Can you have your Vitamin D levels tested at any time of day?

Quote:
Originally Posted by captjane View Post
vitamin d doesn't require fasting and can be done at any time during the day.
It takes significant time to deplete or build up Vit D levels. I believe the half-life or time to reduce one's D levels by half is on the order of 4-8 weeks. And from what I've read in Dr. Michael Holick's book is that Vit D from sunshine lasts longer in the body than oral supplements. There shouldn't be much of a change in your Vit D during just one day even if you received 10,000-20,000 IU worth of Vit D the day before from the sun or received 0 IU.

 
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