To determine the amount of ketones (ketone bodies, acetoacetate, beta-hydroxybutyrate, and acetone) in the blood to help diagnose a life-threatening problem called diabetic ketoacidosis
Blood Ketones
Blood Ketones
Also Known As
Serum Ketones
Plasma Ketones
Beta-hydroxybutyrate
Ketone Bodies
Beta-hydroxybutyric Acid
Acetoacetate
Acetoacetic Acid
Acetone
Formal Name
Blood Ketones
This article was last reviewed
on
This article waslast modified
on
May 26, 2018.
At a Glance
Why Get Tested?
When To Get Tested?
When you have symptoms associated with ketoacidosis, such as increased urination, excessive thirst, dehydration, rapid breathing, and shortness of breath
Sample Required?
A blood sample drawn from a vein in your arm or from a fingerstick
Test Preparation Needed?
None
Accordion Title
Common Questions
-
How is it used?
Blood ketones are primarily used to screen for, detect, and monitor a serious, sometimes life-threatening condition called diabetic ketoacidosis (DKA) in people with type 1 and sometimes type 2 diabetes. DKA can occur when a diabetic's blood glucose is significantly increased, with illness, severe infection, pregnancy, and a variety of other conditions.
DKA is associated with sudden and severe high blood glucose (acute hyperglycemia), a severe insulin deficiency, and a disruption of the body's acid-base balance. Excess ketones and glucose are dumped into the urine by the kidneys in an effort to flush them from the body. This causes increased urination, thirst, dehydration, and a loss of electrolytes. The affected person may also experience symptoms such as rapid breathing, shortness of breath, a fruity scent to the breath, nausea, vomiting, fatigue, confusion, and eventually coma.
Ketosis and ketoacidosis may also be seen with starvation, alcoholism, and with high-fat, low-carbohydrate diets. It may be induced on purpose in some children with epilepsy who have frequent seizures and do not respond to available medications or other treatments.
There are three ketone bodies: acetoacetate, beta-hydroxybutyrate, and acetone. Beta-hydroxybutyrate is the predominant ketone body present in severe diabetic ketoacidosis. Different ketone tests measure one or more ketone bodies, and their results are not interchangeable. (See the "What is being tested?" section for more.)
Blood ketones are sometimes ordered, along with other tests such as blood gases, glucose, and electrolytes, to detect ketoacidosis in non-diabetics if they have signs and symptoms of DKA due to, for example, ingestion of excessive amounts of alcohol.
-
When is it ordered?
Blood ketone tests may be ordered when someone with diabetes has symptoms associated with diabetic ketoacidosis (DKA) and may also be performed whenever there is the potential for DKA to develop, such as when a diabetic is sick or pregnant. With the availability of home monitoring, blood ketones can be ordered as frequently as the person's healthcare provider recommends. Some signs and symptoms of ketoacidosis include:
- Increased urination, excessive thirst
- Dehydration, loss of electrolytes
- Rapid breathing, shortness of breath
- Fruity scent to the breath
- Nausea, vomiting
- Fatigue
- Confusion
- Coma (sometimes)
In non-diabetics, blood ketones are usually ordered when a person has symptoms associated with ketosis or ketoacidosis.
-
What does the test result mean?
If blood ketone levels are increased, then the person has some degree of ketosis or ketoacidosis.
If levels are low or normal, then the person either does not have excess ketone production or the ketone body that is elevated is not being detected by the test method used.
-
Is there anything else I should know?
Recent studies have shown that serum ketones and beta-hydroxybutyrate testing are both effective in diagnosing diabetic ketoacidosis (DKA). Some healthcare practitioners prefer beta-hydroxybutyrate. In acute DKA, the ketone body ratio (beta-hydroxybutyrate:acetoacetate) rises from normal (1:1) to as high as 10:1. In response to insulin therapy, beta-hydroxybutyrate levels commonly decrease long before acetoacetate levels. However, beta-hydroxybutyrate is not available in all laboratories.
-
If I am diabetic, can I just test for glucose instead of ketones?
They are related but not the same thing. While increases in ketones are associated with high glucose concentrations, they can also occur with moderate glucose levels in many conditions, such as when you are sick.
-
Can I test for ketones in my urine instead of my blood?
In many cases, yes, urine is tested much more frequently than blood. However, since it will not detect beta-hydroxybutyrate, the main ketone body with diabetic ketoacidosis (DKA), your healthcare provider may prefer that you monitor your blood.
-
Can I get diabetic ketoacidosis if I have type 2 diabetes?
Yes, although it is not as common as in type 1 diabetes. It may occur in type 2 diabetes, especially when you have a severe infection or illness. Ketosis and ketoacidosis may also be seen in non-diabetics, people with starvation, alcoholism, and with high-fat, low-carbohydrate diets. It may be induced on purpose in some children with epilepsy who have frequent seizures and do not respond to available medications or other treatments.
-
Can I have ketosis or ketoacidosis and not know it?
You could have some degree of ketosis with few symptoms, but the accumulation of ketones triggers the symptoms, so they would emerge as concentrations increase.