SG urine test is actually an abbreviation for urine specific gravity, which is an indicator in a routine urine test. In clinical practice, the value of urine specific gravity can be obtained by taking a urine test. The normal urine specific gravity value is between 1.015 and 1.025. However, the specific gravity of urine is closely related to the amount of water drunk and sweating. When more water is drunk, the specific gravity of urine will decrease because the concentration of substances in urine will be diluted. There are also diseases that may cause changes in the specific gravity of urine, such as diabetes mellitus or diabetic acidosis, and congestive heart failure, which may increase the specific gravity of urine, and renal failure or uremia, which may decrease the specific gravity of urine.