Accuracy of liquid drug dose measurements using different tools by caregivers: a prospective observational study

This study aimed to assess the accuracy of liquid drug dose measurements made by caregivers and explore the factors influencing these measurements. Caregivers (n = 176) of children aged less than 8 years, who were treated at the pediatric clinic of a university hospital in Turkey between July and October 2019, were eligible to participate in this study. The caregivers' ability to accurately measure a 2.5-mL dose of medication was observed using standardized measurement instruments, including 15-mL and 30-mL dosing cups, a 3-mL dropper, a 5-mL dose spoon, and a 5-mL oral syringe. A comparison was made with the reference weight determined for the 2.5-mL dose to calculate the margin of error. A dose of ± 20% of the reference value was considered a clinically significant error. The chi-square test was used to examine differences in dose error rates concerning individual characteristics. Caregivers exhibited a dosing error rate exceeding 20%. Specifically, 43% of the errors occurred when using 15-mL cups, 37% with 30-mL cups, 22% with 3-mL droppers, 4.5% with 5-mL spoons, and 4% with 5-mL syringes. In cases where errors were under 20%, the rates were as follows: 1.1% with 15-mL cups, 2.8% with 30-mL cups, 19% with 3-mL droppers, 3.4% with 5-mL spoons, and 4% with 5-mL syringes. The dosing errors were not affected by the role and health literacy level of caregivers, regardless of the type of dosing tool they used (all p values > 0.05). The study found that oral syringes and dosing spoons had the lowest error rates, whereas dosing cups had the highest error rates.  Conclusion: Healthcare providers in family health centers and pediatric clinics should educate caregivers about proper drug administration with oral syringes and dosing spoons, even if dosing cups are included. What is Known: • Dose calculation errors and incorrect measurement tools are the leading factors causing errors. • Liquid medicine bottles are still often accompanied by dosing cups as measuring instruments. • Both the American Academy of Pediatrics (AAP) and the U.S. Food and Drug Administration (FDA) recommend that parents use standard measuring instruments such as oral syringes, droppers, and measuring spoons instead of kitchen spoons for administering the correct dose to children. What is New: • The measuring tool with the maximum errors was the dosing cup, whereas oral syringes and dosing spoons were more accurate. • Individual administering medication at home and the health literacy level had no effect on the accuracy of dose measurement. • Pediatric nurses, in particular, should incorporate safe liquid medication measurement tools into parental education.