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Chapter 26 Renal System Assessment

Functions of Renal System – Regulate body fluids – Filter metabolic wastes from the bloodstream – Reabsorb needed substances and water into the bloodstream – Eliminate metabolic wastes and water as urine – Formation of Urine
Formation of urine – Glomerular filtration - Hydrostatic and osmotic pressure - Normal GFR in adults is 120–125 mL/min
Renal clearance - Volume of plasma that is cleared of a particular substance in a given time (usually 1 minute)
Serum creatinine Produced when protein or muscle breaks down; a good indicator of kidney function. Creatinine does not increase until at least 50% of kidney function is lost, therefore any elevation is important and must be further assessed
Blood Urea Nitrogen (BUN) Measures kidney excretion of urea nitrogen. Other factors aside from kidney disease elevate BUN.
Renal system disorders - Adult polycystic kidney disease (APKD) - Type 1 and type 2 diabetes mellitus (DM) - Bladder cancer
Age-Related Renal System Changes - Kidney atrophy - Decreased renal blood flow - Decrease in renal tubule function - Decrease in bladder capacity - Increases risk of hyponatremia and nocturia - Urinary incontinence is NOT a normal outcome of aging
Created by: pdimple