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Thread: How long to fast before fasting appointment?

  1. #1
    Join Date
    Aug 2010
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    SC
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    How long to fast before fasting appointment?

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    My much anticipated appointment with the doc is this coming Tuesday morning. They always tell me not to eat or drink after midnight and I don't. Most times I would have cut it off around 8 or 9 a.m..

    Is there any benefit to fasting longer or is there any detriment to fasting longer? I don't want artificially lower numbers, but what would be an appropriate amount of time to fast to get the most accurate and meaningful results?

  2. #2
    I've often heard that ~12 hours before the appointment is a good cutoff time. The link below says that if the number of hours isn't specified, then assume 12 hours:

    Blood test FAQs
    http://www.stjohnprovidence.org/lab/faqs/

  3. #3
    Join Date
    May 2010
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    Minnesnowta
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    12h

  4. #4
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    Aug 2010
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    SC
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    Thanks!

  5. #5
    Join Date
    Sep 2010
    Location
    Queensland, Australia
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    I had this problem the other day, I was too fasted for a blood test (20 hours). The clinic suggested no more than 16 hours.
    Cheers
    Carlye

    WWGD - What Would Grok Do?

  6. #6
    Join Date
    Mar 2010
    Location
    Manitoba, Canada
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    Typical fast recommended for lipid profile is 16 hours. I personally don't hesitate to have some water during this period, but only water, and not a huge amount.

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