BHB raises blood ketone levels after ingestion, providing the body with extra energy in a similar (but not the same) way endogenous ketones do (see sections below for more info). (ketodietapp.com)
As the fat continues, the rate of ketone production exceeds ketone clearance resulting in increased blood ketone levels. (bodyketosis.com)
Unfortunately, these are not as accurate and are not considered a reliable analysis of blood ketone levels. (drjockers.com)