Home telehealth (also called home telemedicine and telehomecare) is "a clinical information system that enables the interaction of voice, video and data using ordinary telephone lines" (Dansky, Bowles, and Palmer 2003), connecting healthcare providers to individuals in their homes. Home telehealth systems consist of a monitor placed in a remote location and a central station. The monitor collects clinical data and transmits the data over ordinary telephone lines to a central station where healthcare providers review the information. Basic measurements include blood pressure, heart rate, and weight. Other peripherals, such as a glucose meter and pulse oximetry, can be added to the system. Systems are either synchronous or asynchronous.