A person needs to fast for 8 to 12 hours before a blood test. Fasting is necessary so that accurate results can be reported. More »

www.reference.com Health Diagnostics & Imaging

Patients should fast for at least 12 hours before they have a fasting blood test, according to St. John Providence Health System. Not all blood tests require patients to fast, but those that do require that patients abst... More »

Hydration, exercise and snacks filled with protein are three strategies for dropping blood sugar levels quickly, according to Diabetic Connect. When diabetics forget to take insulin or do not use insulin in their treatme... More »

www.reference.com Health Diagnostics & Imaging

Patients should fast for at least 12 hours before they have a fasting blood test, according to St. John Providence Health System. Not all blood tests require patients to fast, but those that do require that patients abst... More »

According to Quest Diagnostics, a lipid or glucose tolerance test requires eight hours of fasting. Health care providers may have other recommendations, depending on the type of test. More »

Patients are required to fast for 8 to 16 hours before a glucose tolerance test in order to eliminate the effects of recent meals on blood sugar levels, according to WebMD. This provides an accurate reading of the patien... More »

Individuals do not need to fast before a CBC, or complete blood count, test, states Drugs.com. The test can be done at any time, and the patient does not have to do anything to prepare for the test. More »