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With certain blood tests, you may be instructed to fast for up to eight hours before your appointment. Fasting before a blood draw means you don’t eat or drink anything except water. Don’t wait until the day of your blood draw to ask if you should fast.
Do I need to fast before being tested at a Quest Diagnostics location? Some blood tests do require fasting prior to having your blood drawn. Please contact your healthcare provider to determine his/her requirements for your specific testing.
REQUIRED FASTING TESTS. Patient is required to fast prior to blood draw. See other side for list of recommended tests. *Additonal information in catalog regarding medications or additional fasting information. Corewell Health recommends no caloric or caffeine intake for 8-12 hours prior to testing.
You must fast for at least 12 hours before sample collection. Preparation & Timing. Sample collection must be performed by a phlebotomist, Monday - Friday only. Resources to help you prepare for your blood draw can be found HERE. Your blood draw will be performed at Quest Diagnostics.
How long do I need to fast before my blood test? Your doctor will tell you how long to fast, as it is different for each test. Examples of fasting times for some blood tests are listed in the table below.
Your doctor will tell you how long to fast, as it is diferent for each test. Examples of fasting times for some blood tests are listed in the table below. Table listing how long patients should fast before certain blood tests. Test.
Drawing instructions are intended to help you draw the correct specimen for the test your clinician has requested. First read instructions carefully, you may be required to fast before having a blood test. This is because certain test values change following the digestion of food.
