A Urea, Electrolytes, and Creatinine (UEC) test is a blood test that measures the levels of urea, electrolytes, and creatinine in the blood. These substances are important for kidney function. Urea: Urea is a waste product that is produced by the body. It is removed from the blood by the kidneys. Electrolytes: Electrolytes are minerals that are dissolved in the blood. They are important for many bodily functions, including maintaining fluid balance and blood pressure. Creatinine: Creatinine is a waste product that is produced by the muscles. It is also removed from the blood by the kidneys. A UEC test can be used to diagnose kidney disease, monitor the progression of kidney disease, and assess the response to treatment. The UEC test is a simple and painless procedure that is usually performed in a doctor's office or a laboratory. The patient will need to have a blood sample drawn from a vein in their arm. The results of the test are usually available within a few days. The UEC test is a safe and painless procedure. However, there are some risks associated with any blood test, including: Bleeding at the needle site. Infection. Allergic reaction to the needle or the test solution. It is important to talk to your doctor about the risks and benefits of the UEC test before having the test. Here are some of the reasons why your doctor might order a UEC test: You have symptoms of kidney disease, such as fatigue, swelling, and changes in urination. You have a family history of kidney disease. You are taking medications that can damage the kidneys, such as nonsteroidal anti-inflammatory drugs (NSAIDs). You have diabetes or high blood pressure, which are risk factors for kidney disease. If you have a UEC test, it is important to follow your doctor's instructions. This may include drinking plenty of fluids and avoiding strenuous activity.