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It is widely stated that concentration of cholesterol, triglycerides, lipoprotiens in blood plasma varies widely during the day because of eating, digesting, etc. As far as I know, fasting for 12 hours before blood is drawn for these analysis has been SOP for past 50-100 years. Purpose, of course, is to give reproducable results.
The drinking of water before having blood drawn facilitates that process. Makes it far easier to draw blood because blood is more fluid from the additional water. Decades ago I was involved in medical situation where both fasting and no drinking of any fluids was required for 12 hours before drawing blood -- often problem with blood being too thick to get adequate sized sample -- so, we would have to drink a big glass of water, wait 15 minutes and nurse tried again, usually successful.
Posted: Mon Jun 13, 2011 5:01 am Post subject: fasting
Hi,I fasted the twelve hours before I had my sample taken and the last drink I had was a glass of apple juice and no water.My result came back ok except for my potassium level was raised by a lot and I was told to cut back drastically on any salt I had in food but this had not reared its head before so I put it down to the apple juice.I drink the apple juice to reduce my liver enzyme reading and it does this ok.I am not a big drinker but alcohol doesn,t like me but I am not prepared to abstain fully as I have given up a lot and a drink now and then makes my day.
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