How long should you fast before the blood test?
According to very well health, most blood tests do not require fasting, but some common tests require fasting. If your doctor asks you to fast before the test, it is important that you do so to get the most accurate result. Otherwise, you may have to return for a repeat test.
The type of fasting required for a blood test varies, there are some types that require no food or drinks, not even water, and this is requested before procedures that require sedation or anesthesia because the drugs used can cause nausea and vomiting.
What is the duration of fasting?
In general, you should fast for 8 to 12 hours before the test. The fasting blood sugar test, which is included in the basic metabolic panel, may generally take 8 to 12 hours.
Certain fluids may be permitted, and even advised, before a blood test. This is because a 12-hour fast of fluid drinking can leave you slightly dehydrated, and this flattens your veins and makes it difficult to find them for venipuncture.
Eating food
Eating before certain blood work can affect the results. Specifically, eating before eating a cholesterol panel can raise triglyceride levels and possibly levels of low-density lipoprotein (LDL) cholesterol (known as "bad" cholesterol) . Individuals not taking statins for cholesterol may not be required to fast, and new guidelines suggest that fasting before a lipid test is optional.
Eating before a blood glucose test will raise your blood sugar. However, another test for diabetes, called the hemoglobin A1c test, does not require fasting, because it looks at a marker of glycemic control over the past few months rather than directly measuring blood sugar.
Less common tests that require fasting include:
Gastrin
Proinsulin
Insulin
glucagon
Pancreatic polypeptide
c-peptide
growth hormone levels
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