There are varieties of tests that can be done at home. Most are monitoring tests; some may provide information that could lead to a diagnosis. Among these are pregnancy tests, blood and urine tests for sugar, blood pressure measurements, examination of the breasts and testicles for abnormal lumps, checking feces for signs of blood, and simply taking the temperature. With little or no training,... 

The human body constantly performs an incredibly complex biochemical balancing act; it has intricate built-in mechanisms for adjusting even minute changes in the blood chemistry. Chemicals flow in and out of cells; the lungs exchange oxygen and carbon dioxide; the heart beats regularly, pumping blood throughout the body. But when things go wrong, because of disease or the malfunctioning of...