High concentrations of this substance could indicate that a

High concentrations of this substance could indicate that a person is dieting or may be diabetic

Whites blood cells

crystals

bilirubin

Ketones

Solution

The answer is Ketones.

In diabetic person and dieting person low or absence of insulin leads to release of free fatty acids from adipose tissue by a process called adipose tissue lipolysis which are converted into ketone bodies by beta oxidation in the liver,which leads to high level of ketone bodies.