Send a comment on this item to LII: Send a comment on this item to LII staff, who on weekdays will usually reply within 24 hours. Diagnostic Tests This site explains diagnostic medical tests, how to prepare for them, what happens when the test is performed, risks involved, and when the results will be known. From the online companion to the Harvard Medical School Family Health Guide. http://www.health.harvard.edu/diagnostic-tests/ Asterisk * indicates required field. Your Name Your Email Address * We will not sell or provide your email address to anyone else. Comment * Enter the verification code as it is shown in the box below. This helps prevent automated submissions. *