Ketonemia, also known as ketosis, is a metabolic state in which the level of ketone bodies in the blood is elevated. Synonyms for the term ketonemia include ketoacidosis, ketotic state, and ketonuria. Ketoacidosis is a severe form of ketonemia that occurs when the body is unable to regulate the level of ketone bodies in the blood, resulting in an acidic pH. Ketotic state describes the presence of ketones in the blood of individuals following a fasting or low-carbohydrate diet. Ketonuria is another term for the presence of ketones in the urine, which is commonly used to diagnose ketonemia.