Tube feeding Calculation 17. The patient is ordered Jevity 1.2 cal. You’re supplied with a can of Jevity that contains
237 mL of feeding formula. The doctor orders the tube feeding to be administered at 3/4 strength with a rate of
50 ml/hr. How many mL of water will you add to dilute the tube feeding formula as prescribed?
In clinical settings, healthcare professionals often encounter scenarios where they need to calculate and prepare tube feedings to meet specific nutritional requirements. One such scenario involves diluting a concentrated tube feeding formula to the prescribed strength and administering it at a specified rate. In this essay, we will explore a practical case in which a nurse is required to calculate the volume of water needed to dilute a tube feeding formula to 3/4 strength for administration.
The patient has been prescribed Jevity 1.2 cal, a tube feeding formula, with a can size of 237 mL. The doctor’s order specifies that the tube feeding should be administered at 3/4 strength, and the infusion rate should be 50 mL/hr. To meet this prescription, we need to calculate how much water to add to dilute the tube feeding formula accurately.
The doctor has prescribed Jevity 1.2 cal at 3/4 strength.
To calculate the desired strength, multiply 1.2 cal by 3/4 (0.75):
Desired Strength = 1.2 cal x 0.75 = 0.9 cal/mL
The infusion rate is 50 mL/hr, and the desired strength is 0.9 cal/mL.
To calculate the volume of the Jevity formula needed per hour:
Volume (mL/hr) = Calories per Hour / Desired Strength
Volume (mL/hr) = 50 mL/hr / 0.9 cal/mL ≈ 55.56 mL/hr
We know that the total volume of the Jevity can is 237 mL.
To find the volume of water needed, subtract the volume of Jevity formula required per hour from the total volume of the can:
Volume of Water (mL) = Total Volume of Can – Volume of Jevity Formula
Volume of Water (mL) = 237 mL – 55.56 mL/hr ≈ 181.44 mL
To prepare the tube feeding formula as prescribed, the nurse should add approximately 181.44 mL of water to the 237 mL can of Jevity formula. This dilution will achieve the desired 3/4 strength, and when administered at a rate of 50 mL/hr, it will provide the patient with the prescribed nutritional support while ensuring proper hydration and caloric intake. Tube feeding calculations are essential for delivering accurate and safe nutrition to patients who require enteral feeding in clinical settings.
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