The healthcare provider prescribes lorazepam 50 mcg/kg IM two hours before a scheduled procedure for a client who weighs 74 kg. The medication is "Available in 2mg/mL vial." How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)
The Correct Answer is ["1.9"]
Given:
Ordered dose of Lorazepam: 50 mcg/kg
Patient weight: 74 kg
Concentration of Lorazepam: 2 mg/mL
Step 1: Calculate the total dose of Lorazepam:
Total dose (mcg) = Ordered dose (mcg/kg) x Patient weight (kg)
Total dose (mcg) = 50 mcg/kg x 74 kg
Total dose (mcg) = 3700 mcg
Step 2: Convert mcg to mg:
Total dose (mg) = Total dose (mcg) / 1000 mcg/mg
Total dose (mg) = 3700 mcg / 1000 mcg/mg
Total dose (mg) = 3.7 mg
Step 3: Calculate the volume to be administered:
Volume (mL) = Total dose (mg) / Concentration (mg/mL)
Volume (mL) = 3.7 mg / 2 mg/mL
Volume (mL) = 1.85 mL
Step 4: Round to the nearest tenth:
Volume (mL) ≈ 1.9 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["2"]
Explanation
Given:
Ordered dose of Fentanyl: 100 mcg
Concentration of Fentanyl: 0.05 mg/mL
Step 1: Convert mcg to mg:
Ordered dose (mg) = Ordered dose (mcg) / 1000 mcg/mg
Ordered dose (mg) = 100 mcg / 1000 mcg/mg
Ordered dose (mg) = 0.1 mg
Step 2: Set up the proportion:
Desired dose (mg) / Volume to administer (mL) = Concentration (mg/mL)
Step 3: Substitute the values:
0.1 mg / Volume = 0.05 mg/mL
Step 4: Solve for the unknown volume:
Volume = 0.1 mg / (0.05 mg/mL)
Volume = 0.1 mg x (1 mL / 0.05 mg)
Volume = 2 mL
Correct Answer is ["1.3"]
Explanation
Given:
Ordered dose of amoxicillin: 25 mg/kg/day
Child's weight: 18 pounds
Concentration of amoxicillin suspension: 400 mg/5 mL
Step 1: Convert child's weight from pounds to kilograms:
1 pound (lb) = 0.453592 kilograms (kg)
Child's weight in kg = 18 lbs x 0.453592 kg/lb = 8.164656 kg
Step 2: Calculate the total daily dose of amoxicillin:
Total daily dose (mg) = Ordered dose (mg/kg/day) x Child's weight (kg)
Total daily dose (mg) = 25 mg/kg/day x 8.164656 kg
Total daily dose (mg) = 204.1164 mg/day
Step 3: Calculate the dose per administration:
Since the medication is given every 12 hours, there are 2 administrations per day.
Dose per administration (mg) = Total daily dose (mg) / Number of administrations per day
Dose per administration (mg) = 204.1164 mg/day / 2 administrations/day
Dose per administration (mg) = 102.0582 mg
Step 4: Calculate the volume to be administered per dose:
Volume (mL) = Dose per administration (mg) / Concentration (mg/mL)
Volume (mL) = 102.0582 mg / (400 mg/5 mL)
Volume (mL) = 102.0582 mg x (5 mL / 400 mg)
Volume (mL) = 1.2757275 mL
Step 5: Round to the nearest tenth:
Volume (mL) ≈ 1.3 mL
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