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Posted: 4/25/2024 4:58:28 PM EDT
For certain lab work, they want patients in a fasting state. Typically the advice is 8-12 hours before the appointment.
However, I read that fasting too long can cause inaccurate results. Several websites claim fasting more than 16 hours can skew the numbers. However, none of them say how it would affect them or even which blood test results may be impacted. What does GD say? Is fasting too long before an annual physical a real issue or one of those internet rumors? |
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Posted: 4/25/2024 5:03:52 PM EDT
[#1]
See also: Feldman Protocal.
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Posted: 4/25/2024 5:22:03 PM EDT
[#2]
They say 8-12 hours because most people can barely make it from one meal to the next.
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Posted: 4/25/2024 8:00:54 PM EDT
[#3]
Quote HistoryOriginally Posted By RogerBall: See also: Feldman Protocal. 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? |
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USA
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Posted: 4/25/2024 8:44:45 PM EDT
[#4]
I have gone several days without food with no abnormal swings in the numbers. Even glucose levels out. I get regular blood work as it every month or so. I am in the CC system and can recall graphs with years of data and when you compare the numbers when things are working right its stable when something is off it shows up. The only thing that can get janky is if you are a heavy drinker.
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WI, USA
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Posted: 4/25/2024 9:13:51 PM EDT
[#5]
Lots of places no longer require fasting for a lot of tests. Of course, I found this out after I had been fasting for 12 hours...lol
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KY, USA
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Posted: 4/25/2024 11:23:30 PM EDT
[#6]
I'm type 2 and have fasted for days at a time before. There's a point were I've depleted the glycogen from my muscles that my liver really starts to dump glucose. When this happens my blood sugar will go up even though I haven't eaten.
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Posted: 4/25/2024 11:28:38 PM EDT
[#7]
Originally Posted By bayouhazard: For certain lab work, they want patients in a fasting state. Typically the advice is 8-12 hours before the appointment. However, I read that fasting too long can cause inaccurate results. Several websites claim fasting more than 16 hours can skew the numbers. However, none of them say how it would affect them or even which blood test results may be impacted. What does GD say? Is fasting too long before an annual physical a real issue or one of those internet rumors? Per Dr Berry, yes, there is such a thing as fasting too long. 8-12 hours is idea for blood work. More than 14 hours fasted and I think physiological processes change enough to alter the result of bloodwork. IIRC. |
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Posted: 4/26/2024 9:12:49 AM EDT
[#8]
Quote HistoryOriginally Posted By unseenSNIPER: Per Dr Berry, yes, there is such a thing as fasting too long. 8-12 hours is idea for blood work. More than 14 hours fasted and I think physiological processes change enough to alter the result of bloodwork. IIRC. That's the claim I see online but I can't find details on what markers are affected and whether they're false highs or false lows. |
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WI, USA
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Posted: 4/26/2024 9:26:18 AM EDT
[#9]
When I was in the Army, it was always fast 24 hours before a blood draw. After I retired, the doctors says 12 hours.
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Posted: 4/26/2024 10:19:28 AM EDT
[#10]
Originally Posted By bayouhazard: For certain lab work, they want patients in a fasting state. Typically the advice is 8-12 hours before the appointment. However, I read that fasting too long can cause inaccurate results. Several websites claim fasting more than 16 hours can skew the numbers. However, none of them say how it would affect them or even which blood test results may be impacted. What does GD say? Is fasting too long before an annual physical a real issue or one of those internet rumors? Sometimes the lab fucks up and tells you that you are dying, usually right at closing on Friday night. They redo the labs on Monday and say "nevermind". It wasn't caused by fasting time. |
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Posted: 4/26/2024 10:20:43 AM EDT
[#11]
Quote HistoryOriginally Posted By TODD-67: I have gone several days without food with no abnormal swings in the numbers. Even glucose levels out. I get regular blood work as it every month or so. I am in the CC system and can recall graphs with years of data and when you compare the numbers when things are working right its stable when something is off it shows up. The only thing that can get janky is if you are a heavy drinker. 
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Posted: 4/26/2024 10:35:54 AM EDT
[#12]
Quote HistoryOriginally Posted By wildearp: Yeah, don't get a blood draw after a huge weekend party. |
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Posted: 4/26/2024 10:36:57 AM EDT
[#13]
Another thing too, my Eurologist said to abstain from "sexual release" for at lest two weeks prior to the visit so they can do a really good DRE
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FL, USA
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Posted: 4/26/2024 10:40:55 AM EDT
[#14]
Hmmmm.
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Posted: 4/26/2024 12:49:03 PM EDT
[#15]
Quote HistoryOriginally Posted By midcap: Another thing too, my Eurologist said to abstain from "sexual release" for at lest two weeks prior to the visit so they can do a really good DRE I'm in the USA so I don't need a Eurologist. |
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Posted: 4/26/2024 12:59:43 PM EDT
[#16]
Quote HistoryOriginally Posted By bayouhazard: I'm in the USA so I don't need a Eurologist. Quote HistoryOriginally Posted By bayouhazard: Originally Posted By midcap: Another thing too, my Eurologist said to abstain from "sexual release" for at lest two weeks prior to the visit so they can do a really good DRE I'm in the USA so I don't need a Eurologist. 
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USA
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Posted: 4/26/2024 1:10:15 PM EDT
[#17]
Quote HistoryOriginally Posted By bayouhazard: I'm in the USA so I don't need a Eurologist. 
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FL, USA
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Posted: 4/26/2024 1:13:30 PM EDT
[#18]
Nope. If you go longer than 12 hours it ain't going to show any difference.
I normally do 14-15 hours fasting for blood work. That's is based on my work schedule and when the appointments are available go to the lab. |
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USA
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Posted: 4/26/2024 1:13:55 PM EDT
[#19]
What does it change if you have Coffee with milk and sugar 2 hours before??
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FL, USA
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Posted: 4/26/2024 1:14:24 PM EDT
[#20]
Quote HistoryOriginally Posted By Buzz69: Quote HistoryOriginally Posted By Buzz69: Originally Posted By bayouhazard: Originally Posted By midcap: Another thing too, my Eurologist said to abstain from "sexual release" for at lest two weeks prior to the visit so they can do a really good DRE I'm in the USA so I don't need a Eurologist. I piss off alot of people at work. |
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Posted: 4/26/2024 1:15:10 PM EDT
[#21]
Yup.
During my second pregnancy they sprung the glucose tolerance test on me a few weeks early. I had been sick and hadn’t eaten in about 18 hours. Nurse said it wouldn’t matter. I failed the 1 hour by a few points. I go to take the 3 hour test and was chatting with that nurse and told her about the first test. She said that absolutely could throw off the test. I passed the 3 hour with really good results. I was pissed I had to give up 3 hours to take that test when I could have passed the 1 hour if I had taken it at my next appointment. |
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Posted: 4/26/2024 5:00:04 PM EDT
[#22]
Quote HistoryOriginally Posted By AR18: I piss off alot of people at work. Quote HistoryOriginally Posted By AR18: Originally Posted By Buzz69: Originally Posted By bayouhazard: Originally Posted By midcap: Another thing too, my Eurologist said to abstain from "sexual release" for at lest two weeks prior to the visit so they can do a really good DRE I'm in the USA so I don't need a Eurologist. I piss off alot of people at work. lol |
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Posted: 4/26/2024 5:15:27 PM EDT
[#23]
A couple years ago I went for blood work. Reception asked me if I fasted. I said yes, about 15 hrs. She told me it was too long and to only do 8-12 hrs.
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USA
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Posted: 4/26/2024 6:00:13 PM EDT
[#24]
Quote HistoryOriginally Posted By bayouhazard: I'm in the USA so I don't need a Eurologist. Quote HistoryOriginally Posted By bayouhazard: Originally Posted By midcap: Another thing too, my Eurologist said to abstain from "sexual release" for at lest two weeks prior to the visit so they can do a really good DRE I'm in the USA so I don't need a Eurologist. |
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