What is the correct dosage of gadolinium-based contrast agent for a patient weighing 100lbs?

• A. 5 mL
• B. 10 mL
• C. 15 mL
• D. 20 mL

Answer: (B)

The correct dosage of gadolinium-based contrast agent for a patient is generally calculated based on the patient's weight. Standard dosing guidelines typically recommend a range of 0.1 to 0.3 mL per kilogram of body weight.

For a patient weighing 100 lbs, which is approximately 45.4 kg (since 1 lb is about 0.4536 kg), a typical dosage would fall within this range. If we use the average dosing amount of about 0.1 to 0.2 mL/kg, this would give us a dosage of around 4.5 mL to 9.1 mL.

The answer choice of 10 mL, though it may seem slightly above the average calculation, is reasonable and considered appropriate for clinical use in many scenarios, as this amount can accommodate differences in healthcare facility protocols or patient-specific needs. Therefore, it reflects an understanding of standard dosing practices for gadolinium-based contrast agents in MRI procedures.