Does Time Of The Day Matters For Lab Tests?

Dan W

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Jan 22, 2013
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Fasting and time of day does matter for some of them. I don't know about everything on your list, but I know the time of day at least matters for the DHEA-S, testosterone, TSH, and free T3. And I think fasting affects some of those too.

I personally try to test early in the morning without breakfast because it's easiest to recreate that state consistently for followup labs.
 

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