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Metabolic waste is a substance produced by the body that is useless to the body or produced in excess to the body's needs. Nitrogenous wastes are among the most toxic of the human's metabolic wastes, such as urea, which is a by-product of catabolism. Excretion is the process of eliminating these wastes through the respiratory, integumentary, digestive, and urinary systems.


Urea Source Of Nitrogen >>> You can get additional details at the image link.

from Healthline

Blood Urea Nitrogen (BUN) Test

BUN kidney function test adult women: 6 to 20 mg/dL measures urea nitrogen in body kidneys are/not filering.

The blood urea nitrogen or BUN is a blood test that measures the amount of urea nitrogen in the bloodstream. It reflects how well your kidneys are. When a person is dehydrated, false results might be obtained as BUN levels increase when blood is concentrated. Elevated BUN levels indicate dehydration, excessive protein intake and impaired renal function. Low BUN levels indicate over hydration, liver damage and malnutrition.

from Nurseslabs

Nursing Mnemonics and Tips

Creatinine Serum creatinine levels provide a more sensitive measure of renal damage than do blood urea nitrogen levels. Creatinine is a nonprotein end product of creatinine metabolism that appears in serum and amounts proportional to the body’s muscle mass.