Final answer:
To calculate the number of Armour Thyroid tablets to administer per dose, convert the prescription from grains to milligrams and then divide by the tablet strength. In this case, gr. X, which is 648 mg, divided by the 300 mg tablet strength, results in the administration of three tablets per dose.
Step-by-step explanation:
The question relates to calculating the correct dosage of a thyroid medication called Armour Thyroid. To compute how many tablets to administer per dose when the order states to administer 'Armour Thyroid gr. X' (with 'gr' standing for grain), and the supply available is in 300 mg tablets, you need to perform a unit conversion. One grain (gr) is approximately equal to 64.8 milligrams (mg). Thus, 'gr. X' which refers to ten grains, would be equal to 648 mg (10 x 64.8 mg). Since each tablet contains 300 mg, you would divide the total milligrams needed by the milligram amount per tablet.
To find out the exact number of tablets per dose, perform this calculation: 648 mg (needed per dose) รท 300 mg (per tablet) = 2.16 tablets. Since a partial tablet cannot be administered, you would round up to the nearest whole tablet. Therefore, three tablets will be administered per dose to fulfill the prescribed Armour Thyroid gr. X by mouth daily.