ARRT Patient Care Practice Exam

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Which range of blood urea nitrogen (BUN) is considered normal?

0.6 to 1.5 mg/100mL
4.5 to 6 mg/100mL
8 to 25 mg/100mL
12 to 18 mg/100mL

The correct answer is: 8 to 25 mg/100mL

The range of blood urea nitrogen (BUN) that is considered normal is between 8 to 25 mg/100mL. This measurement is used to evaluate kidney function and the body's protein metabolism. BUN levels can reflect various conditions affecting the kidneys and overall health when they are outside the normal range. Values falling within this specified range indicate that the kidneys are effectively filtering urea from the bloodstream, which is a waste product formed from the breakdown of protein. If BUN levels are within this range, it suggests normal kidney function and proper protein metabolism. Other values provided in the options fall outside the accepted normal range for BUN. The first option represents levels that are too low, while the second option is at the lower threshold but does not encapsulate the full range of normal values. The last option, while showing valid BUN levels, is also narrow and does not represent the complete normal range as accurately as the correct choice does.