By contrasting the urines density with that of water, this test can determine the urines specific gravity. The test aids in determining how well the kidneys are functioning. It is used to identify a number of illnesses that affect urine water content, including dehydration, heart failure, shock, diabetes insipidus, kidney failure, kidney function, urinary tract infection, and low or excessive sodium levels. If you have symptoms like fatigue, nausea, vomiting, a loss of appetite, or cramps, you might require this test.