Serum Tetone Test – Indications, Procedure, Results

Last updated: February 8, 2026 Medically reviewed by: RxHarun Orthopedic Specialist Doctor Reading time: 3 min read

A serum ketone test measures how many ketones are there in the blood.

How the Test is Performed

A blood sample is needed.

How to Prepare for the Test

No preparation is needed.

How the Test will Feel

When the needle is inserted to draw blood, some people feel slight pain. Others feel a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away.

Why the Test is Performed

Ketones are substances produced in the liver when fat cells break down in the blood. This test is used to diagnose ketoacidosis. This is a life-threatening problem that affects people who:

Have diabetes. It occurs when the body cannot use sugar (glucose) as a fuel source because there is no insulin or not enough insulin. Fat is used for fuel instead. When fat breaks down, waste products called ketones build up in the body.
Drink large amounts of alcohol.

Normal Results

A normal test result is negative. This means there are no ketones in the blood.

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your health care provider about the meaning of your specific test results.

What Abnormal Results Mean

A test result is positive if ketones are found in the blood. This may indicate:

Alcoholic ketoacidosis
Diabetic ketoacidosis
Starvation
Uncontrolled blood glucose in persons with diabetes

A diet low in carbohydrates can increase ketones.

Risks

Veins and arteries vary in size from one patient to another and from one side of the body to the other. Drawing blood from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight but may include:

Excessive bleeding
Fainting or feeling lightheaded
Hematoma (blood accumulating under the skin)
Infection (a slight risk any time the skin is broken)

https://www.ncbi.nlm.nih.gov/books/NBK549816/
https://www.ncbi.nlm.nih.gov/books/NBK442030/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3447047/
https://www.ncbi.nlm.nih.gov/books/NBK201/
https://www.ncbi.nlm.nih.gov/books/NBK436014/
https://medlineplus.gov/ency/article/003345.htm
https://medlineplus.gov/lab-tests/hemoglobin-a1c-hba1c-test/
https://en.wikipedia.org/wiki/Glycated_hemoglobin
https://www.cdc.gov/diabetes/managing/managing-blood-sugar/a1c.html
https://www.niddk.nih.gov/health-information/diagnostic-tests/a1c-test
https://en.wikipedia.org/wiki/Blood_type
https://medlineplus.gov/lab-tests/alpha-1-antitrypsin-test/
https://medlineplus.gov/ency/article/003814.htm
https://www.nhs.uk/conditions/angiography/
https://www.radiologyinfo.org/en/info/angioct
https://www.urmc.rochester.edu/encyclopedia/content.aspx?contenttypeid=167&contentid=alpha_1_antitrypsin
https://www.ucsfhealth.org/medical-tests/alpha-1-antitrypsin-blood-test
https://www.stlukes-stl.com/health-content/health-ency-multimedia/testidxa.htm

Frequently Asked Questions

Is this article a replacement for a doctor?

No. It is educational content only. Patients should consult a qualified clinician for diagnosis and treatment.

When should I seek urgent care?

Seek urgent care for severe symptoms, rapidly worsening condition, breathing difficulty, severe pain, neurological changes, or any emergency warning sign.

References

Add references, clinical guidelines, textbooks, journal articles, or trusted medical sources here. You can edit this area later with a custom field named _rx_references.

Written by Dr. Harun Ar Rashid, MD - Arthritis, Bones, Joints Pain, Trauma, and Internal Medicine Specialist

Dr. Md. Harun Ar Rashid, MPH, MD, PhD, is a highly respected medical specialist celebrated for his exceptional clinical expertise and unwavering commitment to patient care. With advanced qualifications including MPH, MD, and PhD, he integrates cutting-edge research with a compassionate approach to medicine, ensuring that every patient receives personalized and effective treatment. His extensive training and hands-on experience enable him to diagnose complex conditions accurately and develop innovative treatment strategies tailored to individual needs. In addition to his clinical practice, Dr. Harun Ar Rashid is dedicated to medical education and research, writing and inventory creative thinking, innovative idea, critical care managementing make in his community to outreach, often participating in initiatives that promote health awareness and advance medical knowledge. His career is a testament to the high standards represented by his credentials, and he continues to contribute significantly to his field, driving improvements in both patient outcomes and healthcare practices. Born and educated in Bangladesh, Dr. Rashid earned his BPT from the University of Dhaka before pursuing postgraduate training internationally. He completed his MD in Internal Medicine at King’s College London, where he developed a special interest in inflammatory arthritis and metabolic bone disease. He then undertook a PhD in Orthopedic Science at the University of Oxford, conducting pioneering research on cytokine signaling pathways in rheumatoid arthritis. Following his doctoral studies, Dr. Rashid returned to clinical work with a fellowship in interventional pain management at the Rx University School of Medicine, refining his skills in image-guided joint injections and minimally invasive pain-relief techniques.