Prior test precautions

Hello i need some advice doctor asked test for b12 and vitamin D so  in some tests like abdomin prior the test we are adviced not to eat but drink lot of water i want to know are there such prior precautions required for b12 and vitaminD test because i forgot to ask please let me know
Thank you
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Doctor Answers (1) on Prior test precautions

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Dr. Anil Kumar Jain Bangalore | General Physician
hello there.

nothing like that.
you just need 4 hour fasting. and should not have been taking the supplements. that will indicate the exact levels of VIT d3 available in your body.
no other prerequisites.

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