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Syme HM Polyuria and polydipsia. IRIS Ltd. Urine Specific Gravity. Moderately concentrated urine: USG 1. Isosthenuria: USG 1.
Further reading Syme HM Polyuria and polydipsia. After you provide a urine sample, it is tested right away. For urine specific gravity, the health care provider uses a dipstick made with a color-sensitive pad. The dipstick color changes and tells the provider the specific gravity of your urine.
The dipstick test gives only a rough result. For a more accurate specific gravity result or measurement of urine electrolytes or osmolality, your provider will send your urine sample to a lab.
If needed, your provider will ask you to collect your urine at home over 24 hours. Your provider will tell you how to do this. Follow instructions exactly. Eat a normal, balanced diet for several days before the test. Your provider will give you instructions for water loading or water deprivation. Your provider will ask you to temporarily stop any medicines that may affect the test results. Be sure to tell your provider about all the medicines you take, including dextran and sucrose.
DO NOT stop taking any medicine before talking to your provider. Also tell your provider if you recently received intravenous dye contrast medium for an imaging test such as a CT or MRI scan. The dye can also affect test results. This test is most often done if your doctor suspects central diabetes insipidus. The test can help tell that disease from nephrogenic diabetes insipidus.
Urinate into the cup until you have a large enough sample, and then finish urinating into the toilet. This is known as the clean-catch or midstream method. This will ensure the best results. A lab technician will use a refractometer to project light into the sample and determine its density.
This is more reliable than the dipstick method, in which a stick is placed in the urine to measure how much it sinks or floats.
Home tests are more susceptible to contamination. Osmolality tests are sometimes used to evaluate how the kidneys dilute and concentrate urine, with osmolality being the index of a concentration. Knowing the osmolality of your urine can help your healthcare provider diagnose certain conditions.
Your healthcare provider will look at the ratio of the density of your urine to the density of water. To put it another way, the specific density of water would be 1. Ideally, urine specific gravity results will fall between 1. Specific gravity results above 1. The higher the number, the more dehydrated you may be. Your healthcare provider will use the results from your urine specific gravity test, along with other urinalysis results, to come up with a diagnosis.
Abnormal specific gravity results could indicate:. A urinalysis can also measure the concentration of various cells. White blood cells can indicate an infection. And glucose can point to glucose intolerance or diabetes.
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