Final answer:
A blood glucose level of 250 mg/dL is significantly higher than the normal range and would likely require further follow-up by the physician, whereas blood pressure of 120/80 mmHg, heart rate of 70 beats per minute, and cholesterol level of 180 mg/dL are considered normal.
Step-by-step explanation:
When a medical assistant is preparing an 18-year-old male for a routine physical, the result that will most likely require further follow-up by the physician is a blood glucose level of 250 mg/dL. This value is significantly higher than the normal range (typically below 140 mg/dL after fasting or below 200 mg/dL at random) and may indicate that the person has diabetes or another health issue that impacts blood glucose levels. The other values mentioned, including a blood pressure of 120/80 mmHg, a heart rate of 70 beats per minute, and a cholesterol level of 180 mg/dL are within normal ranges for a person of his age and do not typically require immediate follow-up.