Patient's question:
What is the reason for high urine specific gravity? Urine specific gravity ≥ 1.030. From going to bed in the morning to the time of the test, I didn't eat dinner or drink any water. Is there any connection?Doctor's answer:
Normal adult urine specific gravity fluctuates between 1.015 and 1.025, while infants and young children have lower urine specific gravity.Urine specific gravity refers to the ratio of the weight of urine to the weight of an equal volume of pure water at 4°C. It determines the concentration of dissolved substances in the urine and is directly proportional to the total solid content. It is commonly used to estimate the kidney's ability to concentrate solutes. In the absence of dehydration or other metabolic disorders, high specific gravity is seen in conditions such as dehydration, proteinuria, diabetes, acute nephritis, and high fever. In chronic kidney disease, isosthenuria may reappear, with specific gravity often fixed at 1.010 ± 0.003.