Concentrated tube feeding formulas have which of the following characteristics?

• A. Osmolality 450-600 mOsm/kg
• B. Osmolality 100-200 mOsm/kg
• C. Contain 70-80% water
• D. Calorie density of 0.5 kcal/ml

Answer: (A)

Concentrated tube feeding formulas deliver more calories in a smaller volume by packing more solutes into the same amount of water. Osmolality measures how many dissolved particles are in a kilogram of water; when you increase solute concentration to boost energy density, osmolality rises accordingly. For concentrated formulas, this osmolality is typically in the 450–600 mOsm/kg range, reflecting their higher solute load. In contrast, a dilute formula would have a much lower osmolality, and a low calorie density (like 0.5 kcal/mL) would not be considered concentrated. So the defining characteristic of these concentrated formulas is their high osmolality due to higher solute—and energy—per unit volume.