Urine volume and specific gravity relationship

Urine specific gravity test: Procedure and results

urine volume and specific gravity relationship

A urine specific gravity test compares the density of urine to the Urinate a small amount, and then place the cup under your urine stream. Finally, measurement by traditional flotation hydrometry requires a large volume of urine. All these factors militate against the use of specific gravity as ameasure. A urine specific gravity test compares the density of urine with the density of water . It allows doctors to see the concentration of all particles that.

Patients in group B were forced to drink fluids and trained to measure h specific gravity using dipstick.

What is a urine specific gravity test?

In this group, each patient got dipsticks and was trained to measure urine specific gravity in different hours. If urine specific gravity was more than 1.

urine volume and specific gravity relationship

Then, with this method, we measured h urine volume in the two groups before intervention, and at 3 months and 6 months after intervention. To compare the mean of urine volume collected three times in the two groups, we used repeated measure analysis of variance ANOVA. To compare the mean of urine volume in the two groups at the same time, we used independent t-test. All data were analyzed with PASW software. There were 33 In group A, there were 23 It shows that patients who used dipstick had more compliance for much more fluid intake.

A report from the third National Health and Nutrition Examination Survey shows that the population prevalence increased from 3.

Density and Specific Gravity

There are several dietary factors that may play an important role in many patients: Fluid, calcium, oxalate, potassium, sodium, animal protein, phytate, sucrose, fructose, and vitamin C intake. A low fluid intake will lead to a low urine output, thereby promoting stone formation by increasing the concentration of calcium and oxalate and accordingly increasing the supersaturation with calcium oxalate.

In one report, for example, patients who had a first kidney stone had a baseline daily urine output that was — mL less than controls. In addition to low fluid intake as a risk factor for incident stone disease, increasing the fluid intake can lead to a reduction in recurrent stone formation. Surveys over a year period for recurrent stone disease reported their frequencies of urinary abnormalities.

Table 3 Comparing h urine volume between before intervention and 6 months after intervention in group A and group B Open in a separate window McCormack and colleagues surveyed the correlation between h urine volumes and mean urine specific gravity in randomly chosen patients. They showed an inverse relationship between urine specific gravity and h urine volume, with a correlation coefficient of 0.

Results showed that using specific gravity dipsticks as a tool for evaluation helped 24 patients increase the h urine volume [ Figure 1 ]. The second reason for a high specific gravity is an increased secretion of anti-diuretic hormone ADH.

urine volume and specific gravity relationship

ADH causes increased tubular water re-absorption and decreased urine volume. Trauma, stress reactions, surgery, and many drugs cause an increase in ADH secretion. A low specific gravity occurs in three situations. In diabetes insipidus, there is an absence or decrease of anti-diuretic hormone. Without anti-diuretic hormone, the kidneys produce an excessive amount of urine, often up to 15 to 20 liters per day with a low specific gravity.

Urine specific gravity

Glomerulonephritis and pyelonephritis cause a decreased urine volume and low specific gravity. In these diseases, damage to the kidney's tubules affects the ability of the kidney to re-absorb water.

As a result, the urine remains dilute. The third reason for low specific gravity is renal failure, which results in a fixed specific gravity between 1. In renal failure, the remaining functional nephrons undergo compensatory structural and hypertrophic changes. These compensatory changes result in urine that is almost isotonic with plasma.

Therefore, a patient experiencing renal failure will present with specimens measuring the same, or fixed, specific gravity regardless of water intake. For example, the first a.