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See also: Feldman Protocal.
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Well... that was an interesting rabbit hole. Thank you for that.
I don't think it answers the question, though, since the Feldman protocol is a multi-day process which someone is unlikely to accidentally perform during routine fasting for blood work.
I don't think Cycolac answered the question either. Granted, many Americans have difficulty fasting much longer than overnight, unless they grew up fasting for religious or cultural reasons. However, in that case, saying "at least eight hours" would be sufficient guidance. Particularly if there's no diagnostic concerns should they fast 16+ hours.
Suppose someone does intermittent fasting. Would it throw off any blood work if they have a doctor appointment at noon and their previous meal was around 6-8pm the prior evening? If so, what's the potential error?