Many of the laboratory tests ordered today are less invasive and more comfortable than the tests they have replaced, and a variety of specimen collection equipment has also been designed with patient comfort in mind.
Don't hesitate to request a modification or a different approach that better suits your needs. For example, if you have felt light-headed or have fainted previously while having your blood drawn, ask to be allowed to lie down for the procedure. You can expect that the health professionals responsible for collecting the sample have been trained to be sensitive to the needs of apprehensive patients and people with special needs. They have some proven strategies to help you and are usually willing to listen to you to determine what will work best in a situation.
Understanding what will happen, communicating your needs to the health professionals assisting you, and employing simple relaxation techniques will help you be most comfortable and prepared for a lab test.