Question 1

How do I calculate tube feeding rate?

Accepted Answer

Use the two-step enteral nutrition formula. Step 1: total daily volume (mL) = calorie goal divided by formula density (kcal/mL). Step 2: pump rate (mL/hr) = total volume divided by feeding hours per day. For 2000 kcal with a 1.5 kcal/mL formula over 24 hours: 2000 / 1.5 = 1333 mL/day, then 1333 / 24 = 55.5 mL/hr.

Question 2

What is a normal tube feeding rate?

Accepted Answer

Typical adult continuous feeds run 40 to 100 mL/hr. Cyclic or nocturnal feeds (8 to 16 hours) run higher, often 80 to 150 mL/hr to deliver the same total volume. Bolus feeds deliver 200 to 400 mL over 15 to 30 minutes. The exact rate depends on the calorie goal, formula density, and patient tolerance.

Question 3

How do I calculate a bolus tube feeding volume?

Accepted Answer

Divide the total daily volume by the number of bolus feeds. For a 1333 mL/day total split into 4 boluses, each is 333 mL given over 15 to 30 minutes. Most adult bolus protocols target 200 to 400 mL per feed, so adjust the number of feeds to keep individual volumes in that range.

Question 4

What is "formula density"?

Accepted Answer

Formula density is the number of calories per milliliter of the specific enteral formula. Common values are 1.0, 1.2, 1.5, and 2.0 kcal/mL. Higher-density (concentrated) formulas deliver more calories in less volume, which is useful for fluid-restricted patients.

Question 5

What is the difference between continuous, intermittent, and bolus feeding?

Accepted Answer

Continuous feeding delivers formula at a constant rate over 24 hours via pump, often 40 to 100 mL/hr. Intermittent feeding gives 4 to 6 feeds per day, each over 30 to 60 minutes. Bolus feeding delivers 200 to 400 mL over 15 to 30 minutes by gravity or syringe, mimicking normal meal patterns.

Question 6

What is a trickle or trophic tube feed?

Accepted Answer

A trickle (trophic) feed is a very low-rate feed of 10 to 20 mL/hr designed to maintain gut integrity rather than meet full nutritional needs. It is commonly used in critically ill patients during early enteral nutrition initiation.

Question 7

How do I initiate and advance tube feeds?

Accepted Answer

Standard practice is to start at 10 to 25 mL/hr and advance by 10 to 25 mL/hr every 4 to 8 hours as tolerated, until the goal rate is reached. Monitor for gastric residual volumes, abdominal distension, nausea, and diarrhea. Always follow the prescribing provider order and institutional protocol.

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