An abnormal increase of ketone bodies in the blood as in diabetes mellitus WordNet 3.0 & Open English WordNet

Ketosis is a metabolic state characterized by elevated levels of ketone bodies in the blood or urine. Wikipedia

Energy production using stored body fats as fuel when carbohydrates are not available Wikidata

Presence of excessive levels of acetone in blood, sometimes occurring in cows during the first weeks after giving birth to a calf. Wiktionary

Presence of excessive levels of acetone in blood. Wiktionary (translation)

An excess of ketones in the blood, sometimes associated with lipolysis. Wiktionary

A metabolic state in which the body produces ketones to be used as fuel by some organs so that glycogen can be reserved for organs that depend on it. This condition occurs during times of fasting, starvation, or while on a ketogenic weight-loss diet. Wiktionary

Metabolic state involving production of ketones. Wiktionary (translation)