How to Control Corrosion by Improving Design. Why is Stainless Steel Corrosion Resistant? An Introduction to Hydrogen Embrittlement. An Intro to Pipeline Corrosion in Seawater. Follow Connect with us. Sign up. Thank you for subscribing to our newsletter! Connect with us. Specific Gravity SP. GR Mean? GR Specific gravity is an important measurement when considering the density of an unfamiliar material.
You may have to take a urine specific gravity test several times in one day. This will help your healthcare provider to see how well your kidneys are compensating. Before you take a urine specific gravity test, your healthcare provider may ask you to do a few things to prepare for it. You should also eat a balanced diet in the days leading up to the test. This diet should exclude certain foods that can affect the color of your urine. These include:. A sample for a urine specific gravity test contains at least 1 to 2 ounces of urine.
The best time to get a sample is first thing in the morning, when your urine is the most concentrated. For the best sample, you should use an antibacterial wipe to clean the area around your urethra.
This will reduce the likelihood that bacteria will contaminate the sample. Urinate a small amount, and then place the cup under your urine stream. 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. Time Traveler for specific gravity The first known use of specific gravity was in See more words from the same year.
Dictionary Entries Near specific gravity specific epithet specific gravity specific-gravity balance See More Nearby Entries. Statistics for specific gravity Look-up Popularity. Style: MLA. English Language Learners Definition of specific gravity. Medical Definition of specific gravity. More from Merriam-Webster on specific gravity Britannica. Get Word of the Day daily email!
Test Your Vocabulary. The kidneys excrete excess water and minerals from the body in the form of urine. When the body needs more water, the kidneys retain fluid. The test should not be uncomfortable and is usually brief.
The doctor might request multiple urine specific gravity tests in one day to see how well the kidneys compensate for a possible problem. To collect a clean catch specimen, a person must clean the urethral area before urinating, then collect the urine sample midstream in a specimen cup. The doctor will send the urine sample to a laboratory for testing.
A laboratory technician performs the test using a refractometer, which projects light into the sample and helps determine the density of the urine. Less commonly , a technician may use dipstick method. The dipstick will change color according to the content of the urine. Preparation for a urine specific gravity test is typically simple and straightforward. A person may need to stop taking certain medications before the test, particularly those that contain sucrose.
People should avoid any foods that can change the color of the urine for a few days leading up to the test. These foods include:. People should also let their doctor know if they have recently received intravenous contrast dye for a medical test. Although it varies slightly between different laboratories, the normal urine specific gravity values are between 1.
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