Ninety-five percent of the nitrogen content of urineis in the form of this substance.
Urea is a product formed by the liver from ammonia andcarbon dioxide. The most important organic substances are urea, uric acid andcreatinine. Of this total,35 g are organic and 25 g are inorganic. The total amount ofsolids in a 24-hour urine sample averages around 60 g. The majority of the constituentsare either waste products of cellular metabolism or products deriveddirectly from certain foods that are eaten. Normal urine is actually a highly complex aqueous solution oforganic and inorganic substances.
#Urine specific gravity lab value series#
The larger clinical laboratoriesgenerally use other methods for reasons of economy.įollowing a discussion of the normal constituents of urine will bea series of tests to detect the presence of abnormal substances.Students will perform the tests on their own urine sample.
Theseconvenient test strips are designed primarily for patient use andphysician office laboratories. For many of the tests, a Test Strip Method will be employedwhich utilizes specially prepared reagent test strips. In this exercise, you will have an opportunity to do some of themore routine tests that are performed in the analysis of a urinesample. The presence of albumin(a protein), glucose, ketones, and various other substances, however,may indicate malfunction of the kidneys or some other organ of thebody. The composition of urine reveals much about body function.Metabolic waste products such as carbon dioxide, urea, uric acid,creatinine, sodium chloride, and ammonia are normally present andhave no particular pathological significance. The amount of urine produced is influenced byenvironmental temperature, fluid intake, time of day, emotionalstate, and many other factors. 1) Know the normal constituents of uring (and the processes bywhich they become part of urine)Ģ) Identify and understand the significance of abnorma urinecomponents.ģ) Define specific gravity and understand the meaning of too highor too low urine specific gravity.Īpproximately 150 L of plasma are purified each day by glomerularfiltration, tubular secretion, and tubular reabsorption to produce0.6 to 2.5 L of urine.
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