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ATI dosage calculation exam
Total Questions : 22
Showing 10 questions, Sign in for moreA nurse is preparing to administer antibiotic X over 20 min. Available is antibiotic X in 50 mL of 0.9% sodium chloride (NSS). The drop factor of the manual IV tubing is 20 gtt/mL. The nurse should set the manual IV infusion to deliver how many gtt / min? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Given:
Total volume to infuse: 50 mL
Infusion time: 20 minutes
Drop factor of tubing: 20 gtt/mL
To find:
Drip rate (gtt/min)
Step 1: Calculate the total number of drops
Total drops = Total volume x Drop factor
Total drops = 50 mL x 20 gtt/mL = 1000 gtt
Step 2: Calculate the drip rate
Drip rate = Total drops / Infusion time in minutes
Drip rate = 1000 gtt / 20 minutes = 50 gtt/min
A nurse is preparing to administer 0.45% sodium chloride (NaC1) 1000 mL IV to infuse over 8 hr. 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
Given:
Total volume to infuse: 1000 mL
Infusion time: 8 hours
To find:
Infusion rate (mL/hr)
Step 1: Calculate the infusion rate
Infusion rate (mL/hr) = Total volume / Infusion time
Infusion rate (mL/hr) = 1000 mL / 8 hours = 125 mL/hr
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 trailing zero.)
Explanation
Given:
Desired dose: Morphine sulfate 2 mg IV bolus
Available concentration: Morphine sulfate 10 mg/mL
To find:
Volume to administer (in mL)
Step 1: Set up the proportion
(Desired dose) / (Available concentration) = Volume to administer
Step 2: Substitute the values
Plugging in the given values, we get:
(2 mg) / (10 mg/mL) = Volume to administer
Step 3: Simplify
To simplify, we can invert the denominator and multiply:
(2 mg) x (1 mL / 10 mg) = Volume to administer
The "mg" units cancel out, leaving us with:
(2 x 1 mL) / 10 = Volume to administer
Step 4: Calculate
Performing the multiplication and division, we get:
2 mL / 10 = Volume to administer
0.2 mL = Volume to administer
A nurse is preparing to administer digoxin 8 mcg/kg/day PO to divide equally every 12 hr for a preschooler who weighs 33 lb. Available is digoxin elixir 0.05 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 use a trailing zero.)
Explanation
Given:
Desired dose: Digoxin 8 mcg/kg/day PO, divided equally every 12 hours
Child's weight: 33 lb
Available concentration: Digoxin elixir 0.05 mg/mL
To find:
Volume to administer per dose (in mL)
Step 1: Convert child's weight to kilograms
1 pound (lb) is approximately equal to 0.453592 kilograms (kg).
multiply:
33 lb x 0.453592 kg/lb ≈ 14.97 kg
Step 2: Calculate the total daily dose of digoxin
Total daily dose = Desired dose (mcg/kg/day) x Child's weight (kg)
Total daily dose = 8 mcg/kg/day x 14.97 kg = 119.76 mcg/day
Step 3: Calculate the dose per administration
We divide the total daily dose by 2:
Dose per administration = Total daily dose / 2
Dose per administration = 119.76 mcg/day / 2 = 59.88 mcg/dose
Step 4: Convert desired dose to milligrams
1 milligram (mg) is equal to 1000 micrograms (mcg).
divide by 1000:
Desired dose (mg) = Desired dose (mcg) / 1000
Desired dose (mg) = 59.88 mcg / 1000 = 0.05988 mg
Step 5: Set up the proportion
(Desired dose) / (Available concentration) = Volume to administer
Step 6: Substitute the values
Plugging in the given values, we get:
(0.05988 mg) / (0.05 mg/mL) = Volume to administer
Step 7: Simplify
To simplify, we can invert the denominator and multiply:
(0.05988 mg) x (1 mL / 0.05 mg) = Volume to administer
The "mg" units cancel out, leaving us with:
(0.05988 x 1 mL) / 0.05 = Volume to administer
Step 8: Calculate
Performing the multiplication and division, we get:
0.05988 mL / 0.05 = Volume to administer
1.1976 mL ≈ Volume to administer
Step 9: Round to the nearest tenth
1.2mL
A nurse is preparing to infuse a 250-mL unit of packed RBCs over 2 hr. The drop factor of the manual IV tubing is 15 gtts/mL. The nurse should adjust the flow rate to deliver how many drops per minute? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Given:
Total volume to infuse: 250 mL
Infusion time: 2 hours
Drop factor of tubing: 15 gtt/mL
To find:
Drip rate (gtt/min)
Step 1: Convert infusion time to minutes
2 hours x 60 minutes/hour = 120 minutes
Step 2: Calculate the total number of drops
Total drops = Total volume x Drop factor
Total drops = 250 mL x 15 gtt/mL = 3750 gtt
Step 3: Calculate the drip rate
Drip rate = Total drops / Infusion time in minutes
Drip rate = 3750 gtt / 120 minutes = 31.25 gtt/min
Step 4: Round to the nearest whole number
31 gtt/min
A nurse is preparing to administer amoxicillin 2 gm/day PO divided into two doses. The amount available is amoxicillin 250 mg tablets. How many tablets should the nurse administer with each dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Given:
Desired dose: Amoxicillin 2 g/day PO divided into two doses
Available concentration: Amoxicillin 250 mg tablets
To find:
Number of tablets to administer per dose
Step 1: Calculate the total daily dose in milligrams
1 gram (g) is equal to 1000 milligrams (mg).
Multiply by 1000:
Total daily dose (mg) = Total daily dose (g) x 1000
Total daily dose (mg) = 2 g x 1000 = 2000 mg
Step 2: Calculate the dose per administration
Divide the total daily dose by 2:
Dose per administration = Total daily dose / 2
Dose per administration = 2000 mg / 2 = 1000 mg
Step 3: Calculate the number of tablets per dose
To find the number of tablets, we divide the desired dose per administration by the strength of each tablet:
Number of tablets = Dose per administration / Tablet strength
Number of tablets = 1000 mg / 250 mg/tablet = 4 tablets
A nurse is preparing to administer midazolam 0.2 mg/kg via IV bolus now. The client weighs 220 lb. How many mg 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
Given:
Desired dose: Midazolam 0.2 mg/kg IV bolus
Client's weight: 220 lb
To find:
Total dose of midazolam (in mg)
Step 1: Convert the client's weight from pounds to kilograms
1 pound (lb) is approximately equal to 0.453592 kilograms (kg).
Multiply by 0.453592:
220 lb x 0.453592 kg/lb ≈ 99.79 kg
Step 2: Calculate the total dose of midazolam
Total dose (mg) = Desired dose (mg/kg) x Client's weight (kg)
Total dose (mg) = 0.2 mg/kg x 99.79 kg = 19.958 mg
Step 3: Round to the nearest whole number
20mg
A nurse is preparing to administer midazolam 0.2 mg/kg via IV bolus now. The client weighs 220 lb. How many mg 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.)
Explanation
Given:
Desired dose: Midazolam 0.2 mg/kg IV bolus
Client's weight: 220 lb
To find:
Total dose of midazolam (in mg)
Step 1: Convert the client's weight from pounds to kilograms
1 pound (lb) is approximately equal to 0.453592 kilograms (kg).
Multiply by 0.453592:
220 lb x 0.453592 kg/lb ≈ 99.79 kg
Step 2: Calculate the total dose of midazolam
Total dose (mg) = Desired dose (mg/kg) x Client's weight (kg)
Total dose (mg) = 0.2 mg/kg x 99.79 kg = 19.958 mg
Step 3: Round to the nearest whole number
20mg
A nurse is preparing to administer lactated Ringer's 400 mL IV bolus to infuse over 3 hr. The drop factor of the manual IV tubing is 20 gtt/mL. The nurse should set the manual IV infusion to deliver how many gtt/min? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero)
Explanation
Given:
Total volume to infuse: 400 mL
Infusion time: 3 hours
Drop factor of tubing: 20 gtt/mL
To find:
Drip rate (gtt/min)
Step 1: Convert infusion time to minutes
3 hours x 60 minutes/hour = 180 minutes
Step 2: Calculate the total number of drops
Total drops = Total volume x Drop factor
Total drops = 400 mL x 20 gtt/mL = 8000 gtt
Step 3: Calculate the drip rate
Drip rate = Total drops / Infusion time in minutes
Drip rate = 8000 gtt / 180 minutes = 44.44 gtt/min
Step 4: Round to the nearest whole number
44 gtt/min
A nurse is caring for client who is postoperative following an appendectomy and prescribed Ds lactated Ringer's at 150 mL/hr continuous IV infusion for 12 hr. The drop factor of the manual IV tubing is 20 gtt/mL. The nurse should set the manual IV infusion to deliver how many gtt/min? (Round the answer to the nearest whole number Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Given:
Infusion rate: 150 mL/hr
Drop factor of tubing: 20 gtt/mL
To find:
Drip rate (gtt/min)
Step 1: Convert the infusion rate from mL/hr to mL/min
Infusion rate (mL/min) = Infusion rate (mL/hr) / 60 minutes/hr
Infusion rate (mL/min) = 150 mL/hr / 60 minutes/hr = 2.5 mL/min
Step 2: Calculate the drip rate
Drip rate (gtt/min) = Infusion rate (mL/min) x Drop factor
Drip rate (gtt/min) = 2.5 mL/min x 20 gtt/mL = 50 gtt/min
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