The Urea (Spot) test is a diagnostic test used to measure the level of urea in the blood. Urea is a waste product that is formed in the liver when the body breaks down proteins. It is then filtered out of the blood by the kidneys and excreted in urine. The Urea (Spot) test is a simple blood test that is usually performed to assess kidney function or to diagnose certain medical conditions, such as liver disease, dehydration, or heart failure. The test is called a spot test because it measures the urea level at a single point in time, rather than over a period of time. The test is quick and relatively easy to perform, and the results can help doctors determine the appropriate treatment for their patients.