Before tests are performed, you will be given certain instructions to follow, in order to get the best and most precise results. These guidelines include:Fasting for at least 12 hours before the test.Avoiding drinking and smoking for at least two days before the test.Getting enough sleep and staying hydrated before the test.Avoiding X-rays while pregnant.For menstruating women, it is advisable to reschedule at a later date in order to get the perfect evaluation of hormones.Before scheduling a test or during consultation, it is imperative that you disclose any information on any chronic, congenital, or recurring diseases that you have to ensure planning a perfect checkup package for yourself.