This blood test, measuring the amount of glucose, is used to screen healthy people for early signs of diabetes during a routine physical exam.
It is advised for pregnant women, people over age 50 and for those at high risk for diabetes. You shouldn’t eat any food or drink anything other than water within eight hours of your test.
Janet Renee is a clinical dietitian with a special interest in weight management, sports dietetics, medical nutrition therapy and diet trends.
When your physician orders certain tests, you may need to fast for several hours prior to the test assure accuracy. A fasting blood test requires that you avoid eating or drinking anything except water for a certain period of time before your blood test.
Your doctor may ask you to take a fasting blood test to determine your cholesterol or blood sugar levels.
Although eating food or consuming drinks containing nutrients, calories or sugar will affect the results of your fasting blood test, drinking water will have no measurable impact because it contains no calories, fats or sugars. If you are dehydrated when the nurse or physician performs your fasting blood test, it can be difficult for them to draw blood from your veins.

Dehydration can also affect your triglyceride count, which is one part of the lipid panel that doctors test along with your cholesterol by means of a fasting lab. A blood sugar levels chart can show you at a glance where your current blood sugar puts you on the range of possible normal and abnormal values. Hypoglycemia, also known as low blood sugar or low blood glucose, is when blood sugar decreases to below normal. Blood sugar chart shows the fasting and post prandial values for a normal person, for a person with early and established diabetes. He or she will discuss steps you can take to lower your glucose levels and whether or not medication is necessary.
She earned her Master of Science in nutrition from the University of Chicago and has contributed to health and wellness magazines, including Prevention, Self, Shape and Cooking Light. The process of fasting ensures that the results of your blood test will not be confused by foods that you have eaten during the last few hours that your body has not fully absorbed.
It is a good idea to drink water before your lipid panel fasting blood test in order to reduce the risk of a deceptively high triglyceride reading due to dehydration. After an overnight fast when you have not eaten for 8-12 hours is a basic way, but then you also need to test blood sugar after eating, typically about 2 hours after eating, to see how high the blood sugar went.

Blood glucose may also be tested in emergencies to determine whether a low or high glucose level is responsible for unconsciousness. It's best to schedule an early-morning appointment for your blood test so you don't have to go all day without eating. You should not eat food, drink coffee or take some medications for eight to 12 hours before a fasting blood test, but most physicians agree that you can drink water. Finally, doctors may have you do a test called an oral glucose tolerance test in which they give you a standard sweet drink in the clinical laboratory and take several blood samples before and after to see how your body handles a standard amount of pure sugar intake. Take a snack and beverage with you so you can eat and drink as soon as your blood is drawn.

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  1. 24.12.2015 at 21:39:46

    Hypoglycaemia because it prevents the liver from.

    Author: Leyla_666
  2. 24.12.2015 at 16:19:56

    Children up to 6 years of age desired blood sugar should be followed.

    Author: sadELovh22
  3. 24.12.2015 at 23:31:49

    Diagnosed and managed successfully, although management options can be quite complex.

    Author: Drakon
  4. 24.12.2015 at 23:28:30

    10-20 g is given by mouth, either indication of hyperglycemia and can be recommended.

    Author: faraon