ATI DOSAGE CALCULATIONS DETAILED ANSWER KEY

1. A provider prescribes 2 g of a medication to give to a client in eight divided doses over the next 24 hr. How many mg should the nurse administer for each dose? A. 250 mg Correct Rationale: 2 g 1 g = X mg 1,000 mgX = 2,000 mg2,000 mg ? 8 = 250 mg Incorrect Rationale: 2 g 1 g = X mg 1,000 mgX = 2,000 mg2,000 mg ? 8 = 250 mg 2. A nurse is calculating the intake of fluid a client recieved during a 9 hr surgery. The fluid includes: Lactated ringers at 150 ml/hour, cefazolin sodium 2 gm IV intermittent bolus in 100 ml of normal saline, two units of packed RBCs at 275 ml and 250 ml; an IV bolus of 250 ml normal saline every four hours, ranitidine 50 mg IV intermittent bolus in 50 ml D5W over 30 minutes. How many mL of fluid should the nurse record? A. 2,525 mL Correct Rationale: LR 150mL x 9 hr = 1350 mLcefazolin = 100 mLRBCs = 275 + 250 = 525mLNS Bolus = 500 mL ranitidine = 50mLTotal fluid = 2,525 mL Incorrect Rationale: LR 150mL x 9 hr = 1350 mLcefazolin = 100 mLRBCs = 275 + 250 = 525mLNS Bolus = 500 mL ranitidine = 50mLTotal fluid = 2,525 mL 3. A client is to receive morphine 20 mg subcutaneously. Available is morphine 25 mg/mL. How many mL should the nurse administer? (Round to the nearest tenth.) A. 0.8 mL Correct Rationale: Desired x Quantity———————-— = Amount to giveHave20 mg x 1 mL ————-–— = X mL25 mg20–– = X mL25X = 0.8 mL