Detailed Answer KeyDosage Calculation Practice_Cloned_Assessment 121. A nurse is preparing to administer morphine sulfate 2 mg IV bolus. Available is morphine sulfate 10 mg/mL. How
many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it
appli...
1. A nurse is preparing to administer morphine sulfate 2 mg IV bolus. Available is morphine sulfate 10 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.)
0.2 mL
Correct Rationale: Follow these steps for the Ratio and Proportion method of calculation: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 2 mg Step 3: What is the dose available?
Dose available = Have 10 mg Step 4: Should the nurse convert the units of measurement?
No Step 5: What is the quantity of the dose available? 1 mL Step 6: Set up an equation
and solve for X. <i>Have</i><i>Desired<i/><hr>  =
 <hr><i>Quantity<i/><i>X</i></br></br>10 mg2 mg<hr>  =  <hr>1
mL<i>X mL</i></br></br><i>X</i> mL = 0.2 mLStep 7: Round if necessary. Step 8:
Reassess to determine whether the amount to administer makes sense. If there are 10
mg/mL and the prescription reads 2 mg, it makes sense to administer 0.2 mL. The nurse
should administer morphine sulfate 0.2 mL IV bolus.Follow these steps for the Desired
Over Have method of calculation: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 2 mg Step 3: What is the dose available? Dose available = Have 10
mg Step 4: Should the nurse convert the units of measurement? No Step 5: What is the
quantity of the dose available? 1 mL Step 6: Set up an equation and solve for X.
<i>Desired<i/> × <i>Quantity</i><i>X</i>  =  <hr><i>Have<i/></br></br>2
<s>mg × 1 mL<i>X</i> mL  =  <hr>10 <s>mg</br></br><i>X</i> mL = 0.2
mLStep 7: Round if necessary. Step 8: Reassess to determine whether the amount to
administer makes sense. If there are 10 mg/mL and the prescription reads 2 mg, it makes
sense to administer 0.2 mL. The nurse should administer morphine sulfate 0.2 mL IV
bolus.Follow these steps for the Dimensional Analysis method of calculation:Step 1: What
is the unit of measurement the nurse should calculate? (Place the unit of measure being
calculated on the left side of the equation.) <i>X</i> mL = Step 2: Determine the ratio that
contains the same unit as the unit being calculated. (Place the ratio on the right side of the
equation, ensuring that the unit in the numerator matches the unit being calculated.) 1
mL<i>X</i> mL  =  <hr>10 mg</br></br>Step 3: Place any remaining ratios
that are relevant to the item on the right side of the equation, along with any needed
conversion factors, to cancel out unwanted units of measurement. 1 mL2 <s>mg<i>X</i>
mL  =  <hr>  ×  <hr>10 <s>mg1 </br></br>Step 4: Solve for
X. <i>X</i> mL = 0.2 mLStep 5: Round if necessary. Step 6: Determine whether the
amount to administer makes sense. If there is 10mg/ml and the prescription reads 2mg, it
makes sense to administer 0.2 mL. The nurse should administer morphine sulfate 0. 2 mL
IV bolus.
InCorrect Rationale: Follow these steps for the Ratio and Proportion method of calculation: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 2 mg Step 3: What is the dose
available? Dose available = Have 10 mg Step 4: Should the nurse convert the units of
measurement? No Step 5: What is the quantity of the dose available? 1 mL Step 6: Set
up an equation and solve for X. <i>Have</i><i>Desired<i/><hr>  =
 <hr><i>Quantity<i/><i>X</i></br></br>10 mg2 mg<hr>  =  <hr>1
mL<i>X mL</i></br></br><i>X</i> mL = 0.2 mLStep 7: Round if necessary. Step 8:
Reassess to determine whether the amount to administer makes sense. If there are 10
mg/mL and the prescription reads 2 mg, it makes sense to administer 0.2 mL. The nurse
should administer morphine sulfate 0.2 mL IV bolus.Follow these steps for the Desired
Over Have method of calculation: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 2 mg Step 3: What is the dose available? Dose available = Have
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10 mg Step 4: Should the nurse convert the units of measurement? No Step 5: What is
the quantity of the dose available? 1 mL Step 6: Set up an equation and solve for X.
<i>Desired<i/> × <i>Quantity</i><i>X</i>  =
 <hr><i>Have<i/></br></br>2 <s>mg × 1 mL<i>X</i> mL  =
 <hr>10 <s>mg</br></br><i>X</i> mL = 0.2 mLStep 7: Round if necessary. Step
8: Reassess to determine whether the amount to administer makes sense. If there are
10 mg/mL and the prescription reads 2 mg, it makes sense to administer 0.2 mL. The
nurse should administer morphine sulfate 0.2 mL IV bolus.Follow these steps for the
Dimensional Analysis method of calculation:Step 1: What is the unit of measurement the
nurse should calculate? (Place the unit of measure being calculated on the left side of
the equation.) <i>X</i> mL = Step 2: Determine the ratio that contains the same unit as
the unit being calculated. (Place the ratio on the right side of the equation, ensuring that
the unit in the numerator matches the unit being calculated.) 1 mL<i>X</i> mL  =
 <hr>10 mg</br></br>Step 3: Place any remaining ratios that are relevant to the
item on the right side of the equation, along with any needed conversion factors, to
cancel out unwanted units of measurement. 1 mL2 <s>mg<i>X</i> mL  =
 <hr>  ×  <hr>10 <s>mg1 </br></br>Step 4: Solve for X. <i>X</i>
mL = 0.2 mLStep 5: Round if necessary. Step 6: Determine whether the amount to
administer makes sense. If there is 10mg/ml and the prescription reads 2mg, it makes
sense to administer 0.2 mL. The nurse should administer morphine sulfate 0. 2 mL IV
bolus.
2. A nurse is caring for a client who has schizophrenia and is experiencing hallucinations. The provider prescribes
chlorpromazine 50 mg IM every 4 hr as needed. Available is chlorpromazine injection 25 mg/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.)
2 mL
Correct Rationale: Follow these steps for the Ratio and Proportion method of calculation: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 50 mg Step 3: What is the dose
available? Dose available = Have 25 mg Step 4: Should the nurse convert the units of
measurement? No Step 5: What is the quantity of the dose available? 1 mL Step 6: Set up
an equation and solve for X. <i>Have</i><i>Desired<i/><hr>  =
 <hr><i>Quantity<i/><i>X</i></br></br>25 mg50 mg<hr>  =  <hr>1
mL<i>X mL</i></br></br><i>X</i> mL = 2 mLStep 7: Round if necessary. Step 8:
Determine whether the amount to administer makes sense. If there are 25 mg/mL and the
prescription reads 50 mg, it makes sense to administer 2 mL. The nurse should administer
chlorpromazine 2 mL IM.Follow these steps for the Desired Over Have method of
calculation: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 50 mg
Step 3: What is the dose available? Dose available = Have 25 mg Step 4: Should the
nurse convert the units of measurement? No Step 5: What is the quantity of the dose
available? 1 mL Step 6: Set up an equation and solve for X. <i>Desired<i/> ×
<i>Quantity</i><i>X</i>  =  <hr><i>Have<i/></br></br>50 <s>mg × 1
mL<i>X</i> mL  =  <hr>25 <s>mg</br></br><i>X</i> mL = 2 mLStep 7: Round
if necessary. Step 8: Determine whether the amount to administer makes sense. If there
are 25 mg/mL and the prescription reads 50 mg, it makes sense to administer 2 mL. The
nurse should administer chlorpromazine 2 mL IM.Follow these steps for the Dimensional
Analysis method of calculation:Step 1: What is the unit of measurement the nurse should
calculate? (Place the unit of measure being calculated on the left side of the equation.)
<i>X</i> mL = Step 2: Determine the ratio that contains the same unit as the unit being
calculated. (Place the ratio on the right side of the equation, ensuring that the unit in the
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numerator matches the unit being calculated.) 1 mL<i>X</i> mL  =  <hr>25
mg</br></br>Step 3: Place any remaining ratios that are relevant to the item on the right
side of the equation, along with any needed conversion factors, to cancel out unwanted
units of measurement. 1 mL50 <s>mg<i>X</i> mL  =  <hr>  ×
 <hr>25 <s>mg1 </br></br>Step 4: Solve for X. <i>X</i> mL = 2 mLStep 5: Round if
necessary. Step 6: Determine whether the amount to administer makes sense. If there are
25 mg/mL and the prescription reads 50 mg, it makes sense to administer 2 mL. The nurse
should administer chlorpromazine 2 mL IM.
InCorrect Rationale: Follow these steps for the Ratio and Proportion method of calculation: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 50 mg Step 3: What is the dose
available? Dose available = Have 25 mg Step 4: Should the nurse convert the units of
measurement? No Step 5: What is the quantity of the dose available? 1 mL Step 6: Set
up an equation and solve for X. <i>Have</i><i>Desired<i/><hr>  =
 <hr><i>Quantity<i/><i>X</i></br></br>25 mg50 mg<hr>  =  <hr>1
mL<i>X mL</i></br></br><i>X</i> mL = 2 mLStep 7: Round if necessary. Step 8:
Determine whether the amount to administer makes sense. If there are 25 mg/mL and
the prescription reads 50 mg, it makes sense to administer 2 mL. The nurse should
administer chlorpromazine 2 mL IM.Follow these steps for the Desired Over Have
method of calculation: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 50 mg Step 3: What is the dose available? Dose available = Have 25 mg Step
4: Should the nurse convert the units of measurement? No Step 5: What is the quantity
of the dose available? 1 mL Step 6: Set up an equation and solve for X. <i>Desired<i/>
× <i>Quantity</i><i>X</i>  =  <hr><i>Have<i/></br></br>50 <s>mg
× 1 mL<i>X</i> mL  =  <hr>25 <s>mg</br></br><i>X</i> mL = 2
mLStep 7: Round if necessary. Step 8: Determine whether the amount to administer
makes sense. If there are 25 mg/mL and the prescription reads 50 mg, it makes sense
to administer 2 mL. The nurse should administer chlorpromazine 2 mL IM.Follow these
steps for the Dimensional Analysis method of calculation:Step 1: What is the unit of
measurement the nurse should calculate? (Place the unit of measure being calculated
on the left side of the equation.) <i>X</i> mL = Step 2: Determine the ratio that contains
the same unit as the unit being calculated. (Place the ratio on the right side of the
equation, ensuring that the unit in the numerator matches the unit being calculated.) 1
mL<i>X</i> mL  =  <hr>25 mg</br></br>Step 3: Place any remaining ratios
that are relevant to the item on the right side of the equation, along with any needed
conversion factors, to cancel out unwanted units of measurement. 1 mL50
<s>mg<i>X</i> mL  =  <hr>  ×  <hr>25 <s>mg1
</br></br>Step 4: Solve for X. <i>X</i> mL = 2 mLStep 5: Round if necessary. Step 6:
Determine whether the amount to administer makes sense. If there are 25 mg/mL and
the prescription reads 50 mg, it makes sense to administer 2 mL. The nurse should
administer chlorpromazine 2 mL IM.
3. A nurse is preparing to instill 840 mL of enteral nutrition via a client's gastrostomy tube over 24 hr using an infusion
pump. The nurse should set the infusion 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.)
35 mL/hr
Correct Rationale: Follow these steps to calculate the infusion rate using the Ratio and Proportion or Desired
Over Have method of calculation:Step 1: What is the unit of measurement the nurse
should calculate? mL/hr Step 2: What is the volume the nurse should infuse? 840 mL Step
3: What is the total infusion time? 24 hr Step 4: Should the nurse convert the units of
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