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ATI Fundamentals For Nursing Chapter 48 (Dosage Calculation) Application Exercises
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A nurse is preparing to administer methylprednisolone 10mg by IV bolus. The amount available is methylprednisolone injection 40mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Do not use a trailing zero.)
0.3 mL
Step 1: What is the unit of measurement the nurse should calculate? mL
Step 2: What is the dose the nurse should administer? Dose to administer = Desired = 10mg
Step 3: What is the dose available? Dose available = Have = 40mg
Step 4: Should the nurse convert the units of measurement? No
Step 5: What is the quantity of the dose available? = Quantity = 1mL
Step 6: Set up the equation and solve for X.
Have/Quantity = Desired/X
40mg/1mL X 10mg/ Xml
X = 0.25
Step 7: Round, if necessary. 0.25 = 0.3
Step 8: Reassess to determine whether the amount to administer makes sense. If there are 40 mg/mL and the prescription reads 10mg, it makes sense to administer 0.3mL. The nurse should administer methylprednisolone injection 0.3mL by IV bolus.
A nurse is preparing to administer lactated Ringer's (LR) IV 100mL over 15 min. The nurse should set the IV infusion pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Do not use a trailing zero.)
400 mL/hr
Step 1: What is the unit of measurement the nurse should calculate? mL/hr
Step 2: What is the volume the nurse should infuse? 100mL
Step 3: What is the total infusion time? 15 min.
Step 4: Should the nurse convert the units of measurement? No (mL = ml)
60 min/15 min = 1 hr/ X hr
X = 0.25
Step 5: Set up an equation and solve for X
Volume (mL)/ Time (hr) = X mL/ hr
100 mL/ 0.25 hr = X mL/ hr
X = 400
Step 6: Round, if necessary
Step 7: Reassess to determine whether the IV flow rate makes sense. If the prescription reads 100mL to infuse over 15 min. (0.25 hr), it makes sense to administer 400mL/hr. The nurse should set the IV pump to deliver LR 100mL IV at 400 mL/hr
A nurse is preparing to administer 0.9% sodium chloride (0.9% NaCl) 250mL IV to infuse over 30 min. The drop factor of the manual IV tubing is 10 gtt/mL. The nurse should adjust the manual IV infusion to deliver how many gtt/min? (Round the answer to the nearest whole number. Do not use a trailing zero.)
83 gtt/min
Step 1: What is the unit of measurement the nurse should calculate? gtt/min
Step 2: What is the quantity of the drop factor that is available? 10 gtt/min
Step 3: What is the volume the nurse should infuse? 250mL
Step 4: What is the total infusion time? 30 min
Step 5: Should the nurse convert the units of measurement? No
Step 6: Set up an equation and solve for X
Volume (mL)/Time (min) x Drop Factor (gtt/mL) = X
250mL/30min x 10 gtt/mL = X gtt/mL
X = 83.3333
Step 7: Round, if necessary. 83.3333 = 83
Step 8: Reassess to determine whether the IV flow rate makes sense. If the amount prescribed is 250mL to infuse over 30 min, it makes sense to administer 83 gtt/min. The nurse should adjust the manual IV infusion to deliver 0.9% NaCl 250mL at 83 gtt/min.
A nurse is preparing to administer metoprolol 200mg PO daily. The amount available is metoprolol 100 mg/tablet. How many tablets should the nurse administer? (Round the answer to the nearest whole number. Do not use trailing zero.)
2 Tablets
Step 1: What is the unit of measurement the nurse should calculate? tablets
Step 2: What is the dose the nurse should administer? Dose to administer = Desired = 200mg
Step 3: What is the dose available? Dose available = Have = 100mg
Step 4: Should the nurse convert the units of measurement? No
Step 5: What is the quantity of the dose available? = Quantity = 1 tablet
Step 6: Set up the equation and solve for X.
Have/Quantity = Desired/X
100mg/1 tablet x 200mg/X tablets
X = 2
Step 7: Round, if necessary
Step 8: Reassess to determine whether the amount to administer makes sense. If there are 100mg/tablet and the prescription reads 200mg, it makes sense to administer 2 tablets. The nurse should administer metoprolol 2 tablets daily.
A nurse is preparing to administer ketorolac 0.5 mg/kg IV bolus every 6 hr to a school-age child who weights 66 lb. The amount available is ketorolac injection 30 mg/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.)
0.5mL
Step 1: What is the unit of measurement the nurse should calculate? kg
Step 2: Set up an equation and solve for X.
2.2 lb / 1kg = client's weight in lb/Xkg
2.2 lb / 1kg x 66 lb / Xkg
X = 30
Step 3: Round, if necessary
Step 4: Reassess to determine whether the equivalent makes sense. If 1kg = 2.2 lb, it makes sense that 66lb = 30kg
Step 5: What is the unit of measurement the nurse should calculate? mg
Step 6: Set up an equation and solve for X.
mg x kg = X
0.5 mg x 30kg = 15mg
15 = X
Step 7: Round, if necessary.
Step 8: Reassess to determine whether the amount makes sense. If the prescription reads 0.5 mg/kg every 6 hr and the school-age child weighs 30kg, it makes sense to give 15mg
Step 9: What is the unit of measurement the nurse should calculate? mL
Step 10: What is the dose the nurse should administer? Dose to administer = Desired = 15mg
Step 11: What is the dose available? Dose available = Have = 30mg
Step 12: Should the nurse convert the units of measurement? No
Step 13: What is the quantity of the dose available? = Quantity = 1mL
Step 14: Set up the equation and solve for X.
Have / Quantity = Desired / X
30mg / 1mL x 15mg / X mL
X = 0.5
Step 15: Round, if necessary.
Step 16: Reassess to determine whether the amount makes sense. If the prescription reads 0.5mg/kg every 6hr and the school-age child weighs 30kg, it makes sense to give 15mg. If there are 30mg in 1mL, it makes sense to give 0.5mL. The nurse should give ketorolac 0.5mL IV bolus every 6hr.
A nurse is preparing to administer dextrose 5% in water (D5W) 1,000 mL IV to infuse over 10hr. The nurse should set the IV infusion pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Do not use a trailing zero.)
100mL/hr
Step 1: What is the unit of measurement the nurse should calculate? mL/hr
Step 2: What is the volume the nurse should infuse? 1,000mL
Step 3: What is the total infusion time? 10hr
Step 4: Should the nurse convert the units of measurement? No
Step 5: Set up an equation and solve for X.
Volume (mL) / Time (hr) = X mL/hr
1,000 mL/ 10hr = X mL/hr
100 = X
Step 6: Round, if necessary.
Step 7: Reassess to determine whether the IV flow rate makes sense. If the prescription reads 1,000mL to infuse over 10hr, it makes sense to administer 100 mL/hr. The nurse should set the IV pump to deliver D5W 1,000mL IV at 100 mL/hr
A nurse is preparing to administer acetaminophen 320mg PO every 4 hr PRN for pain. The amount available is acetaminophen liquid 160 mg/5mL. How many mL should the nurse administer per dose? (Round the answer to the nearest whole number. Do not use a trailing zero.)
10mL
Step 1: What is the unit of measurement the nurse should calculate? mL
Step 2: What is the dose the nurse should administer? Dose to administer = Desired = 320mg
Step 3: What is the dose available? Dose available = Have = 160mg
Step 4: Should the nurse convert the units of measurement? No
Step 5: What is the quantity of the dose available? = Quantity = 5mL
Step 6: Set up the equation and solve for X.
Have/Quantity = Desired/X
160mg/5mL = 320mg/XmL
X = 10
Step 7: Round, if necessary.
Step 8: Reassess to determine whether the amount to administer makes sense. If there are 160mg/5mL and the prescription reads 320mg, it makes sense to administer 10mL. The nurse should administer acetaminophen liquid 10mL PO every 4hr PRN for pain.
A nurse is preparing to administer dextrose 5% in lactated Ringer's (D5LR) 1,000 mL to infuse over 6 hr. 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. Do not use a trailing zero.)
42 gtt/min
Step 1: What is the unit of measurement the nurse should calculate? gtt/min
Step 2: What is the quantity of the drop factor that is available? 15 gtt/mL
Step 3: What is the volume the nurse should infuse? 1,000mL
Step 4: What is the total infusion time? 6hr
Step 5: Should the nurse convert the units of measurement? No (mL = mL.) Yes (hr = min)
1hr/60min = 6hr/X hr
X = 360min
Step 6: Set up an equation and solve for X.
Volume (mL)/Time (min) x Drop factor (gtt/mL) = X
1,000mL/360min x 15 gtt/mL = X gtt/mL
41.6666 = X
Step 7: Round, if necessary. 41.6666 = 42
Step 8: Reassess to determine whether the IV flow rate makes sense. If the amount prescribed is 1,000mL to infuse over 6hr (360 min), it makes sense to administer 42 gtt/min. The nurse should adjust the manual IV infusion to deliver D5LR 1,000mL at 42 gtt/min.
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