Diagnostic tests refer to a series of medical procedures and examinations conducted by healthcare professionals to identify, diagnose or monitor a specific disease or condition. These tests can involve various methods such as blood work, imaging studies like X-rays or MRIs, biopsies, or genetic testing among others. The goal is to gather information about the patient's symptoms and medical history in order to determine potential health issues and develop an appropriate treatment plan. Diagnostic tests can help identify diseases such as cancer, heart disease, diabetes, or infections at their earliest stages when they are most treatable.