The combined calcium and phosphorus in a pn should not exceed 45 meq/l. what is the combined calcium and phosphorus (there are 2 meq po4/mmol) in this pn order and is it considered safe?

The combined calcium and phosphorus given that there are 2 meq po4/mmol is equal to 30 meq/l. We just multiply the given data to the density of the combined elements. since the limit is 45 meq/l, then the dosage is considered as safe for the patient to have.