Does Time Of The Day Matters For Lab Tests?

Discussion in 'Labs' started by jet9, Jul 2, 2018.

  1. jet9

    jet9 Member

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  2. OP
    jet9

    jet9 Member

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    Also should I fast before?
     
  3. Dan Wich

    Dan Wich Member

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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.
     
  4. OP
    jet9

    jet9 Member

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    Makes sense, thank you!
     
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