Quick Answer: What Affects Specific Gravity?

What factors determine the specific gravity?

Services Specific Gravity Determination Specific gravity is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume..

What affects urine specific gravity?

Increases in specific gravity (hypersthenuria, i.e. increased concentration of solutes in the urine) may be associated with dehydration, diarrhea, emesis, excessive sweating, urinary tract/bladder infection, glucosuria, renal artery stenosis, hepatorenal syndrome, decreased blood flow to the kidney (especially as a …

Why is specific gravity important?

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.

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 is a normal specific gravity?

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

What is difference between density and specific gravity?

Density is defined as mass per unit volume. It has the SI unit kg m-3 or kg/m3 and is an absolute quantity. Specific gravity is the ratio of a material’s density with that of water at 4 °C (where it is most dense and is taken to have the value 999.974 kg m-3). It is therefore a relative quantity with no units.

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 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.

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.

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.

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.

Why do we perform specific gravity test?

A urine specific gravity test compares the density of urine to the density of water. This quick test can help determine how well your kidneys are diluting your urine. Urine that’s too concentrated could mean that your kidneys aren’t functioning properly or that you aren’t drinking enough water.

What does a high specific gravity mean?

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

Does temperature affect specific gravity?

Can temperature affect specific gravity? Yes, it can. When using water as a reference for establishing specific gravity, it is almost always assumed that the water is at 4°C, when it’s densest. In cases where the temperature or pressures of the two substances differ, the discrepancy must be corrected.

How does dehydration affect urinalysis results?

The color and clarity of urine, the urine’s specific gravity (the mass of urine is compared with that of equal amounts of distilled water), and the presence of ketones (carbon compounds that signify dehydration) in the urine may all help to indicate the degree of dehydration.

Is 1.030 specific gravity normal?

Normal Results The normal range for urine specific gravity is 1.005 to 1.030. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples.

How does specific gravity work?

The specific gravity of an object is the ratio between the density of an object to a reference liquid. … The specific gravity has no units. If the specific gravity has a value of greater than one, then the object sinks in water and if it is less than one, then the object floats in water.

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.