when having blood drawn to check for vitamin A level ,why can't blood sample be exposed to light?

Answers:
UV light breaks down many vitamins. In the case of Vitamin D, sunlight converts beta-carotene into vitamin D and the level read by the test will be artificially high.
Beta carotene is safer to take than straight vitamin D because it is released slowly into the body so you don't overdose on it. The ones you can overdose on are the fat soluble vitamins A,D,E and K.

Other Answers:
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SUNLIGHT KILLS VITAMINS??
HEAT COAGULATES??
Source(s):
SPECULATIONS
because it is red and too bright!!
Some vitamins degrade with light. That is why they come in white and colored bottles. Logic says if they expose you blood to light it's possible they couldn't get an accurate level?
Light causes a lot of chemicals to oxidize. Oxidation would cause any substance unusefull.

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when having blood drawn to check for vitamin A level ,why can't blood sample be exposed to light?

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