Question 74

Two 500 mg doses can be prepared from a 1 g vial of cefazolin.

A 1 g vial of cefazolin contains 1000 mg of the medication. Since each dose is 500 mg, dividing 1000 mg by 500 mg gives us 2 doses.

A) 1.5

This option is incorrect because 1.5 doses would imply that only 750 mg could be utilized from the vial, which does not accurately reflect the total amount available in a 1 g vial.

B) 2

This option is correct as it accurately represents the number of 500 mg doses that can be obtained from a 1 g vial. With 1000 mg in total, exactly two 500 mg doses can be prepared.

C) 2.5

This option is incorrect because it suggests that 1250 mg could be extracted from the vial, which exceeds the total available amount of 1000 mg.

D) 5

This option is also incorrect, as it implies that there are 2500 mg available in the vial, which is not possible with a 1 g vial containing only 1000 mg of cefazolin.

Conclusion

The correct answer is B) 2, as it accurately reflects the calculation based on the total volume of cefazolin in the vial. All other options miscalculate the available doses, either by underestimating or overestimating the total amount of medication present.