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Urine Ketones (Qualitative)

Published: August 9, 2026Updated: August 16, 2026

This test checks for the presence of ketones in your urine, which can signal your body is breaking down fat for energy instead of sugar.

Quick summary

["Ketones in urine may indicate metabolic issues like diabetes or starvation."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
33903-6
Short code
Ketones Ur Ql
Synonyms
Ketones Ur Ql
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Do Doctors Check for Ketones?

Ketones are byproducts of fat metabolism. High levels in urine can happen when your body struggles to use sugar properly, often seen in conditions like uncontrolled diabetes or severe dehydration. Your doctor may order this test to monitor metabolic health or rule out conditions like diabetic ketoacidosis.

What Does a Positive Result Mean?

A positive result means ketones were detected in your urine. This could be due to fasting, intense exercise, or certain medical conditions. Follow-up with your healthcare provider to discuss next steps, such as adjusting diet or managing a chronic condition.

How Is This Test Done?

This is a simple urine test. You’ll use a dipstick or urine test strip that changes color if ketones are present. The test is quick and done at home or in a lab.

What Can Affect Your Results?

Factors like diet (e.g., low-carb or fasting), exercise, illness, or certain medications can influence ketone levels. If you’re unsure, tell your doctor about any recent changes in diet, activity, or health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Ketones in urine can signal serious conditions like diabetic ketoacidosis, which requires urgent medical attention. They may also appear in people with uncontrolled diabetes, severe dehydration, or eating disorders. Regular monitoring helps manage these conditions and prevent complications.

Short name

Urine Ketones

Frequently asked questions

Why might my doctor ask for this test?
Your doctor may order this test if you have symptoms like frequent urination, excessive thirst, unexplained weight loss, or nausea/vomiting. It’s also common in people with diabetes to monitor ketone levels during illness or poor blood sugar control.
What should I do if I get a positive result?
Contact your doctor immediately if ketones are present, especially if you have diabetes. They may recommend adjustments to your diet, increased hydration, or medical evaluation to prevent serious health risks.
Can I eat or drink before the test?
Yes, you can eat and drink normally before the test unless your doctor instructs otherwise. Avoiding certain foods or fluids beforehand could affect the results, so follow your provider’s guidance.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy