Understanding Your Laboratory Test: A Patient's Guide to Testing, Sample Collection, and Your Results

What is this test and what can it tell my doctor about my health?

The 24-hour urine acetone test measures the amount of acetone in your urine over a 24-hour period. Acetone is a type of ketone body produced when your body breaks down fat for energy, particularly when there isn't enough insulin to use glucose or when you haven't eaten for an extended period.

Why might my doctor order this test for me?

Your healthcare provider may order this test to: monitor diabetic ketoacidosis (DKA), evaluate unexplained high blood sugar, assess metabolic disorders, check for fasting or starvation states, or monitor people following very low-carb diets.

Your sample is usually collected at a laboratory, clinic, or hospital. For a blood test, a trained phlebotomist will clean the skin on your arm, draw a small amount of blood from a vein, and apply a bandage afterward. If a urine sample is needed, follow the instructions provided to collect a clean midstream specimen. Tell your care team about any medications or supplements you take before collection, and let them know if you feel dizzy or unwell during the procedure.

For a 24-hour urine collection: 1) Start by urinating into the toilet upon waking on day 1. 2) For the next 24 hours, collect all urine in the provided container. 3) Keep the container refrigerated or on ice. 4) Return the container to the lab as instructed after collection is complete. Follow your healthcare provider's specific instructions carefully.

Your results are compared with standard reference ranges to show whether your values fall within normal limits. A value that is slightly outside the range is not always a sign of illness, and your doctor will interpret the numbers together with your symptoms, medical history, and other test findings. Always review your report with your healthcare provider before making any decisions about treatment, lifestyle changes, or follow-up testing.

Normal urine acetone levels are typically low or undetectable. High levels (ketonuria) may indicate diabetic ketoacidosis, starvation, excessive alcohol consumption, or a very low-carbohydrate diet. Your doctor will interpret your results based on your overall health and other test findings.