Accuracy of Weighing Simulated Infants With in-Bed and Freestanding Scales While Connected and Disconnected to a Ventilator

PURPOSE: To develop an accurate method of weighing ventilated infants in the clinical setting. SUBJECTS: Two dolls that simulated ventilated infants were adapted to different weights ranging from 745 to 3,995 g. DESIGN: Four methods of weighing ventilated infants were evaluated. The study design used multiple clinical nurses, randomly chosen, to weigh the simulated infants. Freestanding and in-bed scales were used with a simulated ventilated infant being either connected or disconnected from the ventilator tubing for the procedure. RESULTS: The mean weights of the simulated infants measured in the incubator, with or without the ventilator connected, had a mean difference of +/- 2 g from the gold standard. However, the mean weights of the simulated infants measured on the freestanding scales were 12 g < the gold standard of industry calibrated weights (P < 0.001). The measurement error was small both with and without the ventilator connected. This error was proportionally very small for weights over 1,500 g, but was increased for weights < 1,500 g. CONCLUSION: The use of in-bed scales was the most accurate method of weighing simulated infants of all weight categories. This study shows the importance of a consistent and meticulous technique when weighing infants in intensive care. The accuracy of weights is enhanced with the use of in-bed scales, and this is particularly significant in infants less than 1,500 g.