Why Do We Calculate Specific Gravity?

What does specific gravity tell us?

Urinary specific gravity (SG) is a measure of the concentration of solutes in the urine.

It measures the ratio of urine density compared with water density and provides information on the kidney’s ability to concentrate urine.

A urinary specific gravity measurement is a routine part of urinalysis..

What is a normal specific gravity?

The normal range for urine specific gravity is 1.005 to 1.030.

What would a specific gravity of 1.030 indicate to you?

Ideally, urine specific gravity results will fall between 1.002 and 1.030 if your kidneys are functioning normally. Specific gravity results above 1.010 can indicate mild dehydration. The higher the number, the more dehydrated you may be.

How do you test specific gravity?

The normal method of determining specific gravity is to weigh the specimen dry (DW), then to suspend the specimen in water on a string, and to measure the weight pulling on the string (WW) (specimen weight suspended in water). Then you subtract WW from DW, and divide the difference into DW.

Is urine specific gravity of 1.020 normal?

Normal results in adults generally range from 1.010 to 1.020. Abnormal results are generally those below 1.010 or above 1.020. In patients with certain kidney diseases, USG doesn’t vary with fluid intake and is called a fixed specific gravity.

What does a specific gravity of 1.003 mean?

Low specific gravity (SG) (1.001-1.003) may indicate the presence of diabetes insipidus, a disease caused by impaired functioning of antidiuretic hormone (ADH). Low SG also may occur in patients with glomerulonephritis, pyelonephritis, and other renal abnormalities.

What does a specific gravity of 1 indicate?

Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. … If the relative density is exactly 1 then the densities are equal; that is, equal volumes of the two substances have the same mass.

What causes high specific gravity?

High specific gravity suggests that the urine is too concentrated. Conditions that cause high specific gravity include: dehydration. diarrhea or vomiting resulting in dehydration.

What does a specific gravity of 1.020 mean?

Urine specific gravity is a measure of the ratio of the density of urine to the density of water. Urine specific-gravity measurements normally range from 1.002 to 1.030. 5. The NCAA selected a urine specific-gravity measurement of ≤1.020 to indicate euhydration. 4.

What is the use of specific gravity?

Significance and Use 4.1 Specific gravity is an important property of fluids being related to density and viscosity. Knowing the specific gravity will allow determination of a fluid’s characteristics compared to a standard, usually water, at a specified temperature.

Is 1.030 specific gravity normal?

Normal Results The urine specific gravity test is easier and more convenient, and is usually part of a routine urinalysis . The urine osmolality test may not be needed. The normal range for urine specific gravity is 1.005 to 1.030.

What does a specific gravity of 1.025 mean?

Specific gravity is usually 1.010-1.025 (normal range: 1.003-1.030) and highest in the morning. A value >1.025 indicates normal concentrating ability. A value >1.035-1.040 suggests possible contamination, very high levels of glucose, or recently received low-molecular-weight dextran or high-density radiopaque dyes.

What causes low urine specific gravity?

Decreased urine specific gravity may be due to: Damage to kidney tubule cells (renal tubular necrosis) Diabetes insipidus. Drinking too much fluid.