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Urine Ketone

Mechanism
1. Dipstick detects acetic acid
2. Confirmatory Test: Acetest
Normal
1. Negative
Positive
1. Dehydration
2. Starvation or Low Carbohydrate Diets
3. Diabetic Ketoacidosis (DKA)
4. Alcoholic ketoacidosis
5. Isopropanol toxicity
6. Pregnancy
Causes of false positive ketones on Urinalysis
1. Low Urine pH (acidic)
2. Increased Urine Specific Gravity
3. Phenolphthalein
4. Levodopa
Causes of false negative ketones on Urinalysis
1. Delayed urine exam

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This page was written by Scott Moses, MD. This page was last revised before 5/10/08, prior to consistent tracking of revision date. This page was last published on 5/10/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 6.0.

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Urine Ketone

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