Video Library
Ati nurs 4th sem dosage calculation exam
Total Questions : 25
Showing 10 questions, Sign in for moreA nurse is providing discharge teaching to the parent of a child who is prescribed diphenhydramine 25 mg elixir every 4 hr as needed. The amount available is diphenhydramine elixir 12.5 mg/5 mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Calculation:
Desired dose = 25 mg.
Available concentration = 12.5 mg / 5 mL
= 2.5 mg/mL.
- Calculate the volume to administer in milliliters (mL).
Volume to administer (mL) = Desired dose (mg) / Available concentration (mg/mL)
= 25 mg / 2.5 mg/mL
= 10 mL.
A nurse is caring for an adolescent client who has pneumonia and a prescription for cefpodoxime 5 mg/kg PO every 12 hr for 5 days. The client weighs 88 lb. How many mg should the nurse administer per dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Calculation:
- Convert the patient's weight from pounds (lb) to kilograms (kg).
Patient weight (kg) = Patient weight (lb) / 2.2 lb/kg
= 88 lb / 2.2 lb/kg
= 40 kg.
- Calculate the dose in milligrams (mg).
Dose (mg) = Patient weight (kg) x Ordered dose (mg/kg)
= 40 kg x 5 mg/kg
= 200 mg.
A nurse is calculating the intake of a client during the past hr. The client's intake includes lactated Ringer's IV at 150 mL/hr, cefazolin 2gIV intermittent bolus in 100 mL of 0.9% sodium chloride, two units of packed RBCs of 275 mL and 250 mL: two IV bolus infusions of 250 mL of 0.9% sodium chloride, and famotidine 20 mg IV intermittent bolus in 50 mL of 0.9% sodium chloride. How many mL of intake should the nurse record?
Explanation
Calculation:
- Identify all sources of fluid intake.
Lactated Ringer's IV: 150 mL (from 150 mL/hr rate)
Cefazolin IV bolus: 100 mL
Packed RBCs: 275 mL + 250 mL
0.9% Sodium Chloride IV bolus: 250 mL + 250 mL
Famotidine IV bolus: 50 mL
- Add all the volumes together to find the total intake.
Total intake (mL) = 150 + 100 + 275 + 250 + 250 + 250 + 50
= 1325 mL.
A nurse is preparing to administer vancomycin 1000 mg in 100 mL of D5W to infuse over 1.5 hours. The drop factor of the manual IV tubing is 15 gtt/ml. The nurse should adjust the manual IV infusion to deliver how many gtt/min? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Calculation:
Total volume = 100 mL.
Infusion time = 1.5 hours
= 1.5 hours x 60 minutes/hour
= 90 minutes.
Drop factor = 15 gtt/mL.
- Calculate the infusion rate in drops per minute (gtt/min).
Infusion rate (gtt/min) = (Total volume (mL) x Drop factor (gtt/mL)) / Total time (min)
= (100 mL x 15 gtt/mL) / 90 min
= 1500 gtt / 90 min
= 16.666... gtt/min.
- Round to the nearest whole number.
= 17 gtt/min.
A nurse is preparing to administer Ringer's lactate by continuous IV infusion at 120 mL/hr. The drop factor of the manual IV tubing is 60 gtt/mL. The nurse should set the manual IV infusion to deliver how many gtt/min? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Calculation:
Flow rate = 120 mL/hr.
Drop factor = 60 gtt/mL.
- Calculate the infusion rate in drops per minute (gtt/min).
Infusion rate (gtt/min) = (Flow rate (mL/hr) x Drop factor (gtt/mL)) / 60 minutes/hr
= (120 mL/hr x 60 gtt/mL) / 60 minutes/hr
= 120 gtt/min.
A client is receiving 500 mg of metronidazole IVPB q8h. The metronidazole has been placed in 100 mL D5W to infuse over 45 minutes. The administration set delivers 10 gtt/mL. At what rate in gtt/min should the IV infuse? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Calculation:
Total volume = 100 mL.
Infusion time = 45 minutes.
Drop factor = 10 gtt/mL.
- Calculate the infusion rate in drops per minute (gtt/min).
Infusion rate (gtt/min) = (Total volume (mL) x Drop factor (gtt/mL)) / Total time (min)
= (100 mL x 10 gtt/mL) / 45 min
= 1000 gtt / 45 min
= 22.222... gtt/min.
- Round to the nearest whole number.
= 22 gtt/min.
A provider prescribes dextrose 5% in water IV to infuse at 100 mL/hr. The drop factor on the manual IV tubing is 60 gtt/ml. The nurse should set the IV flow rate to deliver how many gtt/min? (Round the answer to the nearest whole number)
Explanation
Calculation:
Flow rate = 100 mL/hr.
Drop factor = 60 gtt/mL.
- Calculate the infusion rate in drops per minute (gtt/min).
Infusion rate (gtt/min) = (Flow rate (mL/hr) x Drop factor (gtt/mL)) / 60 minutes/hr
= (100 mL/hr x 60 gtt/mL) / 60 minutes/hr
= 100 gtt/min.
A client is to receive enoxaparin 30 mg subcutaneously. Available is enoxaparin 40 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Calculation:
Desired dose = 30 mg.
Available concentration = 40 mg/mL.
- Calculate the volume to administer in milliliters (mL).
Volume to administer (mL) = Desired dose (mg) / Available concentration (mg/mL)
= 30 mg / 40 mg/mL
= 0.75 mL.
- Round to the nearest tenth.
= 0.8 mL.
A client weighing 50 kg is to receive a dobutamine infusion at 3 mcg/kg/min. The available medication is 250 mg of dobutamine in 500 mL DSW. How many ml/hr will the nurse program the pump? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Calculation:
- Calculate the total dose per minute for the patient.
Total dose per minute (mcg/min) = Patient weight (kg) x Ordered dose (mcg/kg/min)
= 50 kg x 3 mcg/kg/min
= 150 mcg/min.
- Calculate the concentration of the medication in the IV solution.
Convert milligrams (mg) to micrograms (mcg): 250 mg = 250,000 mcg.
Concentration (mcg/mL) = Total drug (mcg) / Total volume (mL)
= 250,000 mcg / 500 mL
= 500 mcg/mL.
- Calculate the infusion rate in mL per minute.
Infusion rate (mL/min) = Desired dose (mcg/min) / Concentration (mcg/mL)
= 150 mcg/min / 500 mcg/mL
= 0.3 mL/min.
- Convert the infusion rate from mL per minute to mL per hour.
Infusion rate (mL/hr) = Infusion rate (mL/min) x 60 min/hr
= 0.3 mL/min x 60 min/hr
= 18 mL/hr.
The nurse is preparing a heparin drip for a client who weights 176 lb. The available heparin is infusion 20,000 units in 1,000 ml 0.9% sodium chloride. The order is to deliver a bolus then initiate a drip at 18 units/kg/hr. What will the nurse program the infusion pump to deliver? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Calculation:
- Convert the patient's weight from pounds (lb) to kilograms (kg).
Patient weight (kg) = 176 lb / 2.2 lb/kg
= 80 kg.
- Calculate the total units per hour.
Total units/hr = Patient weight (kg) x Ordered dose (units/kg/hr)
= 80 kg x 18 units/kg/hr
= 1440 units/hr.
- Calculate the concentration of the available heparin.
Concentration (units/mL) = Total units / Total volume
= 20,000 units / 1,000 mL
= 20 units/mL.
- Calculate the infusion rate in milliliters per hour (mL/hr).
Infusion rate (mL/hr) = Total units per hour / Concentration
= 1440 units/hr / 20 units/mL
= 72 mL/hr.
Sign Up or Login to view all the 25 Questions on this Exam
Join over 100,000+ nursing students using Naxlex’s science-backend flashcards, practice tests and expert solutions to improve their grades and reach their goals.
Sign Up Now
