Dosage Calculation RN Fundamentals
Online Practice Assessment 3.0
1 g = ___ mg - ANS-1000 mg
\1 kg=___lb - ANS-2.2 lb
\1 kg=__g - ANS-1000 g
\1 L= ____ mL - ANS-1000 mL
\1 mg= _____ mcg - ANS-1000 mcg
\1 oz =__mL - ANS-30 mL
\1 tbsp= ___ mL - ANS-15 mL
\1 tbsp=__ tsp - ANS-3 tsp
\1 tsp = ___ mL - ANS-5 mL
\A nurse is caring for a patient who weighs 128 lb. What is the patient's weight in kg?
(Round to nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.) -
ANS-Answer: 58.2 kg
Follow these steps for the Ratio and Proportion method of calculation:
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/ 1 kg = Client's weight in lb /X kg
2.2 lb/ 1 kg = 128 lb / X kg
X kg = 58.181818 kg
Step 3: Round if necessary. 58.181818 kg = 58.2 kg
Step 4: Determine whether the weight conversion makes sense. If the client weighs 128 lb and
2.2 lb equals 1 kg, it makes sense that the client weighs 58.2 kg.
\A nurse is preparing a label for amoxicillin oral suspension that was just reconstituted. The
nurse should document on the label that the medication should be discarded how many days
following reconstitution?
(Picture of Amoxicillin label:
Front: Brand name, Amoxicillin for oral suspension, 400 mg/5mL, 75 mL (when reconstituted),
when reconstituted: each 5 mL contains: Amoxicillin as the trihydrate 400mg)
back: Usual dosage: administer every 12 hours. net contents: Equivalent of 6 grams of
amoxicillin). Directions for mixing: tap bottle until all powder flows freely; Add aproximately 1/3
total amount of water for reconstitution (total=51 mL); shake vigorously to wet powder; each 5
mL contains: Amoxicillin 400mg. Keep tightly closed. Shake well before using. Rerigeration is
preferable but not required. Discard suspension after 14 days.) - ANS-Answer: 14 days
, Explanation: According to the medication label, the amoxicillin oral suspension should be
discarded 14 days following reconstitution to reduce the risk of injury to the client.
\A nurse is preparing to administer 2 Tbsp of ibuprofen to a client. How many mL should the
nurse administer per dose?
(Round to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
- ANS-Answer: 30 mL
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 Tbsp
Step 3: What is the dose available? Dose available = Have 1 mL
Step 4: Should the nurse convert the units of measurement? Yes (Tbsp does not equal mL)
1 Tbsp / 15 mL = 2 Tbsp / X mL
X mL = 30 mL
Step 5: Round if necessary.
Step 6: Determine whether the amount to administer makes sense. If the prescription reads 2
Tbsp and 1 Tbsp equals 15 mL, it makes sense to administer 30 mL. The nurse should
administer ibuprofen 30 mL.
\A nurse is preparing to administer 750,000 units of procaine penicillin G IM. Available is
procaine penicillin G injection 600,000 units/mL. How many mL should the nurse administer per
dose?
(Round answer to nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.) -
ANS-Answer: 1.3 mL
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 750,000
units
Step 3: What is the dose available? Dose available = Have 600,000 units
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.
Have/ Quantity= Desired /X
600,000 units/1 mL = 750,000 units/X mL
X mL = 1.25 mL
Step 7: Round if necessary. 1.25 mL = 1.3 mL
Step 8: Determine whether the amount to administer makes sense. If there are 600,000
units/mL and the prescription reads 750,000 units, it makes sense to administer 1.3 mL. The
nurse should administer procaine penicillin G 1.3 mL IM.
\A nurse is preparing to administer benzathine penicillin G 1,200,000 units IM. Available is
benzathine penicillin G injection 600,000 units/mL. How many mL should the nurse administer?
Online Practice Assessment 3.0
1 g = ___ mg - ANS-1000 mg
\1 kg=___lb - ANS-2.2 lb
\1 kg=__g - ANS-1000 g
\1 L= ____ mL - ANS-1000 mL
\1 mg= _____ mcg - ANS-1000 mcg
\1 oz =__mL - ANS-30 mL
\1 tbsp= ___ mL - ANS-15 mL
\1 tbsp=__ tsp - ANS-3 tsp
\1 tsp = ___ mL - ANS-5 mL
\A nurse is caring for a patient who weighs 128 lb. What is the patient's weight in kg?
(Round to nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.) -
ANS-Answer: 58.2 kg
Follow these steps for the Ratio and Proportion method of calculation:
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/ 1 kg = Client's weight in lb /X kg
2.2 lb/ 1 kg = 128 lb / X kg
X kg = 58.181818 kg
Step 3: Round if necessary. 58.181818 kg = 58.2 kg
Step 4: Determine whether the weight conversion makes sense. If the client weighs 128 lb and
2.2 lb equals 1 kg, it makes sense that the client weighs 58.2 kg.
\A nurse is preparing a label for amoxicillin oral suspension that was just reconstituted. The
nurse should document on the label that the medication should be discarded how many days
following reconstitution?
(Picture of Amoxicillin label:
Front: Brand name, Amoxicillin for oral suspension, 400 mg/5mL, 75 mL (when reconstituted),
when reconstituted: each 5 mL contains: Amoxicillin as the trihydrate 400mg)
back: Usual dosage: administer every 12 hours. net contents: Equivalent of 6 grams of
amoxicillin). Directions for mixing: tap bottle until all powder flows freely; Add aproximately 1/3
total amount of water for reconstitution (total=51 mL); shake vigorously to wet powder; each 5
mL contains: Amoxicillin 400mg. Keep tightly closed. Shake well before using. Rerigeration is
preferable but not required. Discard suspension after 14 days.) - ANS-Answer: 14 days
, Explanation: According to the medication label, the amoxicillin oral suspension should be
discarded 14 days following reconstitution to reduce the risk of injury to the client.
\A nurse is preparing to administer 2 Tbsp of ibuprofen to a client. How many mL should the
nurse administer per dose?
(Round to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
- ANS-Answer: 30 mL
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 Tbsp
Step 3: What is the dose available? Dose available = Have 1 mL
Step 4: Should the nurse convert the units of measurement? Yes (Tbsp does not equal mL)
1 Tbsp / 15 mL = 2 Tbsp / X mL
X mL = 30 mL
Step 5: Round if necessary.
Step 6: Determine whether the amount to administer makes sense. If the prescription reads 2
Tbsp and 1 Tbsp equals 15 mL, it makes sense to administer 30 mL. The nurse should
administer ibuprofen 30 mL.
\A nurse is preparing to administer 750,000 units of procaine penicillin G IM. Available is
procaine penicillin G injection 600,000 units/mL. How many mL should the nurse administer per
dose?
(Round answer to nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.) -
ANS-Answer: 1.3 mL
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 750,000
units
Step 3: What is the dose available? Dose available = Have 600,000 units
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.
Have/ Quantity= Desired /X
600,000 units/1 mL = 750,000 units/X mL
X mL = 1.25 mL
Step 7: Round if necessary. 1.25 mL = 1.3 mL
Step 8: Determine whether the amount to administer makes sense. If there are 600,000
units/mL and the prescription reads 750,000 units, it makes sense to administer 1.3 mL. The
nurse should administer procaine penicillin G 1.3 mL IM.
\A nurse is preparing to administer benzathine penicillin G 1,200,000 units IM. Available is
benzathine penicillin G injection 600,000 units/mL. How many mL should the nurse administer?
