Lab
Urine Ketone
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Urine Ketone
Mechanism
Dipstick detects acetic acid (
Acetoacetate
)
In
Diabetic Ketoacidosis
,
Beta-Hydroxybutyrate
(primary
Ketone
) is converted to
Acetoacetate
Confirmatory Test
Urine
Acetest tablet test
Blood (preferred)
Beta-Hydroxybutyrate
Best
Ketone
test
Basic chemistry panel
Ketoacidosis
Low serum bicarbonate
Increased
Anion Gap
Normal or resolving
Ketoacidosis
Normal serum bicarbonate
Normal
Anion Gap
Interpretation
Normal
Negative
Causes
Positive
Dehydration
Starvation or
Low Carbohydrate Diet
s
Diabetic Ketoacidosis
(DKA)
Alcoholic Ketoacidosis
Isopropanol toxicity
Pregnancy
Causes
False Positive
Ketone
s on
Urinalysis
Low
Urine pH
(acidic)
Increased
Urine Specific Gravity
Phenolphthalein
Levodopa
Causes
False Negative
Ketone
s on
Urinalysis
Delayed urine exam
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