If a patient weighs 176 lbs, what is the dosage of contrast (0.1mmol/kg) that should be administered?

To determine the correct dosage of contrast based on the patient's weight, it is essential to convert the weight from pounds to kilograms, as the dosage is expressed in mmol per kilogram.

1. Start by converting the weight:

• The conversion factor is 1 kilogram = 2.20462 pounds.

• Therefore, to convert 176 pounds to kilograms:

176 lbs ÷ 2.20462 = approximately 79.83 kg.

2. Next, apply the dosage guideline of 0.1 mmol/kg:

• Multiply the body weight in kilograms by the dose per kilogram:

79.83 kg × 0.1 mmol/kg = approximately 7.983 mmol.

3. Now, convert the mmol dose to mL, based on the concentration of the contrast agent being used, which, in most cases, is around 0.5 mmol/mL for commonly used gadolinium-based contrast agents:

• To find the volume in mL:

7.983 mmol ÷ 0.5 mmol/mL = approximately 15.966 mL.

This rounds to about 16 mL. Therefore, the correct dosage of contrast to administer in this situation