RESUMEN
BACKGROUND: This study aimed to confirm that the incremental dose/clicks system dispenses accurate doses for the Merck family of fertility pen injectors. RESEARCH DESIGN AND METHODS: Set doses (Vset) for three dose dial settings (minimum dose [Vmin], midpoint dose [Vmid] and maximum dose [Vmax] for the follitropin alfa, choriogonadotropin alfa [D2 classification: single use/variable dose], and follitropin alfa:lutropin-alfa 2:1 combination pen injectors) or a single Vset for the choriogonadotropin alfa (D1 classification: single use/single dose) were assessed. Last dose administered by the multi-dose device was assessed for the 900 IU, 450 IU, 300 IU and 150 IU follitropin alfa, and the 900:450 IU, 450:225 IU and 300:150 IU follitropin alfa:lutropin-alfa 2:1 combination pen presentations. RESULTS: Dose accuracy tests for Vmin, Vmid and Vmax for the follitropin alfa and the follitropin alfa:lutropin-alfa 2:1 combination pen injectors, and last dose administered, were within acceptable limits according to ISO 11,608-1:2012/2014. Dose accuracy tests for the single use/single dose device classification and the single use/variable dose device classification of the choriogonadotropin alfa pen injector were also within the acceptable limits, according to ISO 11608-1:2000/2014. CONCLUSIONS: The Merck family of fertility pen injectors functions reliably and the incremental dose/clicks system dispenses accurate doses.