4. Increased Ketones in the Breath or Urine
Another way to measure blood ketone levels is a breath analyzer.
It monitors acetone, one of the three main ketones present in your blood during ketosis (4, 10).
This helps give you an idea about your body’s ketone levels, since more acetone leaves the body when you are in nutritional ketosis (11).
The use of acetone breath analyzers has been shown to be fairly accurate, but less accurate than the blood monitor method.
Another good technique is to measure the presence of ketones in your urine on a daily basis with special indicator strips.
These also measure ketone excretion through the urine and can be a quick and cheap method to assess your ketone levels daily. However, they are not considered very reliable.
Bottom Line: You can measure your ketone levels with a breath analyzer or urine strips. However, they are not as accurate as a blood monitor.