How could a person with high blood sugar (glucose) levels also be in a state of ketosis?

Issue
How could a person with high blood sugar (glucose) levels also be in a state of ketosis?

Best Tip

Easily. When cells don't properly handle and traffic glucose they can end up having a hard time feeding it into the metabolic pathways used to release energy.

Most commonly we see this in diabetics. They have cells which don't take up the glucose without help (insulin). The glucose builds up on the outside of the cells and in the bloodstream while the metabolic machinery inside the cell starves and switches to using proteins and amino acids yielding ketosis.

Others
when someone is hyperglycemic, there is a chance in the "morning" one can experience the amount of glycogen being released because of chronic fasting or improper diet...see a dr.
Hyperglycemic or high blood sugar will cause metabolic acidosis. This is due to Hyperosmolarity lead to osmotic diuresis and an osmotic shift of fluid to the intravascular space, resulting in further intracellular dehydration. The result of this is lack of cellar respiration and there is then a build up of CO2. The CO2 is acidosis is a pH imbalance.
Hope that helps
Jmensch explained it right, it is also because of protein intake, the person is probably on a bad diet or, perhaps even dieting but not likely, perhaps apetite decreased and the lack of carbs made it go into ketosis, she or he should check every morning, as well as go get checked, should let physician know, perhaps he or she can recomend a better eating plan.
What you are describing could be very dangerous and if your someone you know are spilling ketones and their glucose levels are high, you/they should see a doctor asap. It could be an illness, or it could be a lack of usuable insulin. High ketone levels, especialy accompanied with high glucose levels can cause ketoacidosis. It's VERY dangerous wreaking havoc on your organs and can lead to coma and death.
Ketoacidosis is a continuous problem with my son who was diagnosed with diabetes 7 years ago. It is a very dangerous condition and although I find it easy to detect when he is having an episode I have been told by doctors that not everyone is able to smell the "rotting fruit / nail polish remover" scent that accompanies ketoacidosis. It is caused when the patient is unable to produce insulin sufficiently and the liver and kidneys attempt to compensate for the lack of pancreatic activity. This causes the rapid burning of essential gases within the body to fuel the process and can dehydrate the patient rapidly to the point of death.