Video Library
Dosage calculation rn maternal newborn proctored assessment 3.2
Total Questions : 34
Showing 10 questions, Sign in for moreA nurse is preparing to administer acetaminophen 56 mg PO to a newborn. Available is acetaminophen oral solution 160 mg/5 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
Formula:
Dose to administer (mL) = (Ordered dose (mg) / Available dose (mg)) × Available volume (mL)
Given:
Ordered dose: 56 mg
Available dose: 160 mg/5 mL
Volume (mL) = (56 mg / 160 mg) × 5 mL
= 0.35 × 5 mL
= 1.75 mL
Rounded to the nearest tenth: 1.8 mL.
The nurse will administer 1.8 mL of acetaminophen.
A nurse is preparing to administer fentanyl 100 mcg IM one time for pain to a client who is in labor and requests pain medication. Available is fentanyl injection 0.05 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Available dose: 0.05 mg/mL
Conversion of mcg to mg
1 mg = 1000 mcg
Given 0.05mg
(0.05mg × 1000mcg)/1mg
Therefore 0.05 mg = 50mcg
Available dose: 50 mcg/mL
Ordered dose: 100 mcg
Formula:
Dose to administer (mL) = Ordered dose (mcg) / Available dose (mcg/mL)
Given:
Volume (mL) = 100 mcg / 50 mcg/mL
= 2 mL
The nurse will administer 2 mL of fentanyl.
A nurse is preparing to administer docusate sodium PO to a postpartum client who has a prescription for 200 mg/day in two equally divided doses. The client states she has trouble swallowing tablets and capsules. Therefore, the nurse has obtained docusate sodium liquid 50 mg/5 mL. How many mL 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
Determine the single dose: Total daily dose / Number of doses per day
Given:
Total daily dose: 200 mg
Doses per day: 2
Single dose: 200 mg / 2
= 100 mg
Calculate the volume:
(Single dose / Available dose) × Available volume
Given;
Single dose: 200 mg / 2 = 100 mg
Available dose: 50 mg/5 mL
Volume (mL) = (100 mg / 50 mg) × 5 mL
= 2 × 5 mL
= 10 mL
The nurse will administer 10 mL of docusate sodium per dose.
A nurse is preparing to administer 0.9% sodium chloride 200 mL over 30 min. The nurse should set the IV infusion pump to administer how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Flow rate = Total volume(mL)/Time(hr)​
Given:
Total volume = 200 mL
Time = 30 min = 0.5 hr
Flowrate= 200ml/0.05hr
=400 mL/hr
The IV infusion pump should be set to administer 400 mL/hr.
A nurse is preparing to administer heparin 1,000 units/hr via continuous IV infusion to a client. Available is heparin 25,000 units in 0.9% sodium chloride 250 mL. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
mL/h r= Ordered dose/ Available concentration
Given:
Ordered Units/hr = 1,000 units/hr
Concentration = 25,000 units / 250 mL
= 100 units/mL
mL/hr = (1,000units/hr)/100units/mL​
=10mL/hr
The IV pump should be set to deliver 10 mL/hr.
A nurse is preparing to administer digoxin 0.25 mg PO to a client who has heart failure and is at 35 weeks of gestation. Available is digoxin 0.125 mg tablets. How many tablets should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Numberoftablets = Desireddose/ Available dose​
Given:
Desired dose = 0.25 mg
Available dose = 0.125 mg
Numberoftablets = 0.25mg/0.125mg​
=2tablets
The nurse should administer 2 tablets.
A nurse is caring for a newborn who weighs 3,500 g. The nurse should record the newborn's weight as how many kg? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Using the conversion factor:
1kg = 1000g
Given:
Newborn's weight = 3500g
= (3500g × 1kg)/1000g
= 3.5kg
The nurse should record the newborn's weight as 3.5 kg.
A nurse is preparing to administer procaine penicillin G 800,000 units IM. Available is procaine penicillin G injection 600,000 units/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
Volume(mL)=Desireddose(units)/Availableconcentration(units/mL)
Given:
Desired dose = 800,000 units
Available concentration = 600,000 units/mL
Volume(mL) = 800,000units/ 600,000units/mL
=1.333...mL
Rounded to the nearest tenth: 1.3 mL
The nurse should administer 1.3 mL.
A nurse is reviewing a new prescription for propranolol 200 mg PO daily divided in equal doses every 12 hr for a client who has migraine headaches during the premenstrual period. Available is propranolol solution 4 mg/mL. How many mL should the client self-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
Calculate the dose per 12 hours:
Total daily dose: 200 mg
Dose per 12 hours: = 200 mg / 2
= 100 mg
Calculate the volume to administer:
Volume (mL) = Desired dose (mg) / Available concentration (mg/mL)
= 100 mg / 4 mg/mL
= 25 mL
The client should self-administer 25 mL per dose.
A nurse is preparing to administer lidocaine 1.7 mg/min via continuous IV infusion to a client who is pregnant and has a ventricular arrhythmia. Available is lidocaine 1 g in dextrose 5% in water 250 mL. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Convert grams to milligrams:
1 g = 1000 mg
Calculate the concentration of lidocaine:
1000 mg / 250 mL = 4 mg/mL
Calculate the mL/min rate:
1.7 mg/min / 4 mg/mL = 0.425 mL/min
Calculate the mL/hr rate:
0.425 mL/min × 60 min/hr = 25.5 mL/hr
Round to the nearest whole number:
= 26 mL/hr
The nurse should set the IV pump to deliver 26 mL/hr.
Sign Up or Login to view all the 34 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
