What Are Fasting Blood Tests?

By on August 5th, 2017

Blood tests are supposed to tell you whether or not there is something wrong in your body. Analyzing your blood can give important information on your blood fats, glucose and other nutrients which should be present in blood in certain amounts. The results of some blood tests like mch blood test might be influenced by the foods and beverages that you consume before the actual analysis. Substances introduced in your body before the tests might alter the results and provide inaccurate conclusions.

Fasting Blood Tests are usually the ones which measure you levels of blood fats, your triglycerides and your blood sugar. These levels are highly dependent on the foods you have consumed in the hours prior to the actual tests. If you are interested in how much vitamin A or E is in your body, you also need to fast before blood is taken for tests. However, if you don’t know for sure whether fasting is required for your blood tests, you have to ask your physician or someone from the laboratory. They can tell you for sure if you can eat or not before going for blood testing.

Most fasting blood tests require not consuming any food for twelve hours before the tests. This is the case with tests measuring cholesterol and triglycerides. This means that if you go to the laboratory in the morning, you should not have anything to eat starting with the night prior to the test. There are also other tests requiring a shorter fasting of only eight hours. This means that you can have a regular dinner before going to the laboratory in the morning. It is important to know in advance whether or not you need fasting and how long this should be in order not to obtain irrelevant results.

Generally speaking, all you can consume while fasting is water. Absolutely no food is allowed and you can’t chew gum under any circumstances. In some cases you might also be allowed to consume coffee or other liquids, but stick to water if you are unsure. Your physician should be able to inform you on the possibility of drinking any other liquids than water.

It is very important to meet the requirements for your blood tests. Otherwise, the results might be influenced by food or drinks and might lead to the conclusion that you suffer of diabetes or any other medical condition. You can easily imagine that getting treatment for a condition you don’t have can be dangerous. If your blood tests results come out wrong, ask your physician if you should have fasted before performing them. In case of a positive answer, inform him that you haven’t because you might need to repeat the tests for determining real and accurate values.

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