Test Preparation

Prior to visiting Labcorp for a diagnostic test, you may want to ask your physician the following questions:

• What test is being performed?
• Why does the test need to be done?
• What type of specimen is needed for testing (blood, saliva, urine, semen, stool, hair)? When can I expect to hear about my test results?
• How will the test results affect the course of my care?
• Talk to your doctor if you are currently taking biotin (Vitamin B7) or are considering adding biotin, or a supplement containing biotin, to your diet.
• Download information about biotin (Vitamin B7) and potential interference with certain laboratory tests.

Sometimes special preparation is required to improve the accuracy of a test. This may involve:

• Fasting (not eating any or certain foods) for several hours or even overnight
• Drinking more or less water than usual
• Avoiding certain medications or vitamin and herbal supplements prior to testing.  It is important to talk to your doctor about the medications you are currently taking (including supplements and other over-the-counter medications) before making changes prior to having laboratory tests performed.

If you are delivering a specimen to the lab, there might be special instructions for transporting the specimen. Your physician should provide you with written instructions for preparing for your test. Follow those instructions exactly as they are written. If you are not certain if special preparation is required, or if you have questions about the instructions you were given, contact your physician's office.

If you did not follow the test preparation instructions you received from your physician, let the staff at the specimen collection lab know about this before your specimen is collected.