it depends on certain things like your iron level for instance if your fasting some bodies, most any way, don't have enough to back you up in which will cause your iron levels to go down.
Are there any blood tests you have to fast 24 hours for?
I don't think you have to fast for twelve hours if you are having blood sugar tested. I would say you need to fast for at least six hours to eight hours.
Depending on the type of blood test you're taking, there may be different preparation requirements. In general, it's best to fast for at least 8-12 hours before a blood test that checks for glucose or lipids. You should also inform the lab about any medications you're taking, as they may affect the test results.
3 hours
The answer to this question is it depends. Certain types of blood tests, such as a blood glucose screen, require you to fast for a minimum of eight hours prior to the test to get accurate results. Other types of test results are not affected by whether you eat prior to testing or not.
It depends on the type of blood test. For fasting sugar tests it can have an affect. Fasting longer than 12 to 14 hours will cause your body to start utilizing glycogen that is primarily stored in your muscles and that can affect blood tests for fasting sugar.
Yes, you need to fast. You should fast from food for approximately 12 hours, and fast from fluids for approximately 8 hours.
I'm afraid not. In fact your doctor may even require you to fast for up to twelve hours prior to the test in order to get accurate results.
Various sources indicate that overnight fasting needs to be from 8 to 12 hours. It is obviously important to reach the minimum, but also to not exceed 16 hours as this can yield unreliable results.
THERE ABOUTS DRINK PLENTY OF FRESH WATER FOR FAST RESULTS
So the food doesn't affect your blood in any way (it can raise or lower your normal blood sugar levels).
Twelve hours, according to my cardiologist.