Question

To obtain a urine specific gravity (USG), what is the correct step-by-step process?

A)
1. Collect a fresh urine sample.
2. Mix the urine to ensure homogeneity.
3. Use a refractometer to measure the specific gravity.
4. Record the result.
B)
1. Allow the urine sample to stand for 24 hours.
2. Centrifuge the sample to remove sediment.
3. Use a dipstick to assess specific gravity.
4.Record the result.
C)
1. Collect a midstream urine sample.
2. Measure the pH using litmus paper.
3. Dilute the sample with distilled water.
4. Heat the sample to evaporate excess water.
D)
1. Collect a urine sample in a red-top tube.
2. Send the sample to the laboratory for analysis.
3. Request a specific gravity test.
4. Wait for the laboratory results.

Answer 1

To obtain urine specific gravity (USG), one must collect a fresh urine sample, mix it, measure the specific gravity with a refractometer, and then record the result.

Step-by-step explanation:

To obtain a urine specific gravity (USG), the correct step-by-step process is:

1. 
   
2. Collect a fresh urine sample.
3. 
   
4. Mix the urine to ensure homogeneity.
5. 
   
6. Use a refractometer to measure the specific gravity.
7. 
   
8. Record the result.

Specific gravity is a measure of the quantity of solutes per unit volume of a solution. In the context of urine, it helps in understanding the kidney's ability to concentrate urine and is indicative of various medical conditions. A refractometer is used to measure this property as it provides a quick and accurate reading. Specific gravity is traditionally easier to measure than osmolarity which is the number of osmoles per liter of fluid. A urine specific gravity higher than pure water indicates the presence of solutes.