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Another question about fasting for blood tests


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I've been told to have nothing but water before a blood test. I normally have fasting tests for glucose and cholesterol, among other things.

Can I have black coffee? I'm a huge caffeine addict and I'm a menace on the road heading out first thing in the morning before a cup of coffee.

This is related to that other thread, but I decided to start a new thread because I hate thread-stealers.

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I think the clue was in the instruction 'nothing but water'. Smile So do what you've been asked.   Caffeine may or may not affect the results of the test but you should be able to go one morning without the stuff.

I agree GI jane.  a person can go without even the water.  I take my blood test with nothing to eat or drink for however many hours the doctor tells me  then there is no doubt if my blood work is correct.

 Do as dr. orders.Cry  All drs are different.  My dr. lets me have black coffee and water.  I have blood glucose and cholestrol workup every 3-6 months.  I have been for the last 3 years.  Ask him for the next time you have it done if it is okay for coffee. 

I just had blood work done last weekend and they told me only water...I asked if black coffee was o.k. and they said no.  If you do it the right way, you'll save yourself time and trouble in the long run.  Don't waste your time fasting and having blood drawn if your going to skew the results.  It's no biggie...schedule it early and then you can drink coffee and eat a nice breakfast by 9:00am...you'll be fine. 

My doctor told me that black coffee is fine to have before a blood test.  However, from reading other posts here, I'd say that you haven't found out a damn thing. Surprised

From Yahoo Q & A:

 

Q. Can I drink coffee (without the cream and sugar) before a fasting blood test?

A. Not if you want accurate results. Don’t have coffee, tea, juice or any liquid other than water. Don’t chew gum, don’t smoke, don’t even exercise. Be a monk until the test is done.

The fasting blood test, also known as a fasting blood sugar (FBS) or blood sugar level test, measures the amount of glucose in the bloodstream. It’s used primarily to screen for diabetes and to monitor hyperglycemia (too much glucose) or hypoglycemia (not enough glucose).

Caffeine, which is absorbed into the system at an incredible rate, can temporarily raise blood sugar levels and make for an inaccurate FBS reading. Moreover, the chemical composition of roasted coffee beans is nearly 40 percent sugar (in the form of polysaccharides). Drinking coffee will stimulate the pancreas to excrete insulin, which balances blood sugar, and throw off your test results.

 

 

Original Post by mommakitty:

My doctor told me that black coffee is fine to have before a blood test.  However, from reading other posts here, I'd say that you haven't found out a damn thing. Surprised

you understand that there's an incredibly wide range of blood tests, right?  every one of those little vials is coded for a different set of tests.  a "blood test" is not one thing.  depending on what they're testing for, different things can affect the results. 

listen to the freaken doctor.  why is this so difficult?

 

Thanks mommakitty - that stuff from Yahoo was very helpful. As pgeorgian mentioned, there's a bazillion things to test, but one thing my doctor is very interested in is my fasting glucose. I'm diabetic and I don't want to throw my reading off.

My home test results have been MUCH better lately and I'm due for lab tests in a week or so. Thanks everyone!

TO pgeorgian.....

Cool WORD!   

Original Post by jedoom:

I agree GI jane.  a person can go without even the water.  I take my blood test with nothing to eat or drink for however many hours the doctor tells me  then there is no doubt if my blood work is correct.

One can go without water before a blood test, but usually drinking water and staying hydrated before a blood test makes it easier for the tecnician to draw blood.  At least in my experience, when I didn't drink water before getting a blood test it was harder for the techs to find a vein.  I somtimes had to get stuck several times and in several places.  When I drank water constantly before I had a blood test it was bing-bang-boom over!

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