Within the United States and the United Kingdom, a distinction is made between the cause of death (sometimes referred to as the "mechanism of death"), which is a specific disease or injury, versus manner of death, which is primarily a legal determination. Different categories are used in different jurisdictions, but manner of death determinations include everything from very broad categories like "natural" and "homicide" to specific manners like "traffic accident" or "attempted or self-induced abortion". In some cases an autopsy is performed, either due to general legal requirements, because the medical cause of death is uncertain, upon the request of family members or guardians, or because the circumstances of death were suspicious.