Complete Blood Count (CBC) Test: What It Is, Why It Is Done, and How to Prepare

A complete blood count, or CBC, is a common blood test that measures the different cells in your blood, including red blood cells, white blood cells, and platelets, giving your healthcare team a broad picture of your overall health.

The urine acetoacetate test measures the amount of acetoacetate, a type of ketone body, in your urine. Ketones are produced when your body breaks down fat for energy instead of using glucose. This typically happens when there is not enough insulin to use glucose for energy, such as in diabetes, or during prolonged fasting, very low-carbohydrate diets, or excessive alcohol consumption.

This test is performed to check for a wide range of conditions such as anemia, infections, and blood clotting problems, to monitor an existing medical condition, or to evaluate how treatments like chemotherapy or certain medications are affecting your blood cells.

This test is mainly ordered to: 1) Diagnose and monitor diabetic ketoacidosis (DKA), a serious complication of diabetes; 2) Check ketone levels in people with diabetes, especially when blood sugar is consistently high; 3) Monitor individuals following ketogenic diets or fasting protocols; 4) Evaluate unexplained symptoms like nausea, vomiting, or abdominal pain that may be related to ketone buildup.

A small sample of blood is drawn from a vein, usually in your arm, by a trained healthcare professional. The procedure takes only a few minutes, and you may feel a quick sting or pinch when the needle is inserted before the sample is sent to a laboratory for analysis.

A urine sample is collected in a sterile container. You may be asked to clean the genital area before collection to avoid contamination. The sample is then sent to a laboratory for analysis. Some healthcare providers may use dipstick tests that provide immediate results, though laboratory testing is more accurate.

Results outside the normal reference ranges may point to conditions such as anemia, infection, inflammation, or bleeding disorders, but abnormal values alone do not confirm a diagnosis. Your healthcare provider will interpret your CBC results together with your symptoms, medical history, and other test findings.

Results are typically reported as negative (normal) or positive. A negative result means no detectable ketones in the urine, which is normal. A positive result indicates ketones are present and is usually reported as small (+), moderate (++), or large (+++). Higher levels suggest more significant ketone production, which may indicate diabetic ketoacidosis or other metabolic conditions requiring prompt medical attention.