Final answer:
The correct expected BUN level for a patient with a serum creatinine level of 0.7 mg/dL is option c. 10-20 mg/dL, which falls within the normal range of 8-20 mg/dL for BUN levels.
Step-by-step explanation:
The expected Blood Urea Nitrogen (BUN) level should be within the range of 8-20 mg/dL, which corresponds with option c. 10-20 mg/dL. BUN is an important indicator of kidney function, reflecting how well the kidneys are working to clear urea from the blood. Creatinine is a waste product that is filtered by the kidneys, and the BUN level reflects the amount of urea, a byproduct of protein metabolism, in the blood. Since the patient's serum creatinine level is 0.7 mg/dL, their BUN level would likely be within the normal range. The serum creatinine level of 0.7 mg/dL mentioned by the student is within the normal range of 0.6-0.9 mg/dL for females and 0.8-1.2 mg/dL for males, suggesting normal renal functions unless other symptoms or test results indicate otherwise.