RD Exam Prep: Clinical Calculation
Questions And Answers
Determine calorie content of a PN solution with 25% dextrose in
500 mL. -
correct answer ✅500mL x 0.25 = 125g dextrose
125g dextrose x 3.4 kcal/g = 425 kcal
What is the amount of additional water provided by switching the
current formula of jevity 1.2 @ 55 mL/hr with 61% fluid to Osmolite
1.2 @ 80 mL/hr with 75% fluid? -
correct answer ✅55mL/hr x 24hrs = 1320mL x .61 = 805mL water
80mL/hr x 24 hrs = 1920mL x .75 = 1440mL
1440mL - 805mL = 635mL
Determine the calories of amino acids in the new rate of a
parenteral nutrition solution. The patient is currently receiving:
total of 600 mL solution/day, of which is 400 mL 5% amino acids,
but your new final rate needed is 60 mL/hr/day. -
correct answer ✅Current solution: 600mL/d
New solution: 60mL/hr x 24 hrs = 1440mL/d
, RD Exam Prep: Clinical Calculation
Questions And Answers
(600/400) = (1440/x)
600x = 400 x 1440
600x = 576000
x = 960mL of 5% amino acids
960mL x 0.05 = 48g amino acids
48g amino acids x 4 kcal/g = 192 kcal amino acids
A patient needs to increase calories by 200 kcal/d. How much
weight will the patient gain over the course of 24 weeks? -
correct answer ✅200kcal/day x 7 days/wk = 1400kcal/wk
1400kcal/wk x 24 wks = 33600kcal
33600kcal / 3500kcal/lb = 9.6lbs
Calculate the number of calories provided from carbohydrates in
the following PN solution with the following rate: 45 mL over 21 hr.
Questions And Answers
Determine calorie content of a PN solution with 25% dextrose in
500 mL. -
correct answer ✅500mL x 0.25 = 125g dextrose
125g dextrose x 3.4 kcal/g = 425 kcal
What is the amount of additional water provided by switching the
current formula of jevity 1.2 @ 55 mL/hr with 61% fluid to Osmolite
1.2 @ 80 mL/hr with 75% fluid? -
correct answer ✅55mL/hr x 24hrs = 1320mL x .61 = 805mL water
80mL/hr x 24 hrs = 1920mL x .75 = 1440mL
1440mL - 805mL = 635mL
Determine the calories of amino acids in the new rate of a
parenteral nutrition solution. The patient is currently receiving:
total of 600 mL solution/day, of which is 400 mL 5% amino acids,
but your new final rate needed is 60 mL/hr/day. -
correct answer ✅Current solution: 600mL/d
New solution: 60mL/hr x 24 hrs = 1440mL/d
, RD Exam Prep: Clinical Calculation
Questions And Answers
(600/400) = (1440/x)
600x = 400 x 1440
600x = 576000
x = 960mL of 5% amino acids
960mL x 0.05 = 48g amino acids
48g amino acids x 4 kcal/g = 192 kcal amino acids
A patient needs to increase calories by 200 kcal/d. How much
weight will the patient gain over the course of 24 weeks? -
correct answer ✅200kcal/day x 7 days/wk = 1400kcal/wk
1400kcal/wk x 24 wks = 33600kcal
33600kcal / 3500kcal/lb = 9.6lbs
Calculate the number of calories provided from carbohydrates in
the following PN solution with the following rate: 45 mL over 21 hr.
