To the Editor: In the article by Sachs et al. about home monitoring of uterine activity (Nov. 7 issue),1 the authors make numerous errors in their “analysis” of our study.2 The role of home uterine-activity monitoring is to provide objective data about uterine contractions to facilitate the early diagnosis of labor. This results in the provision of more effective tocolytic therapy and the subsequent prolongation of pregnancy.3 The authors state that to be effective, this form of technology should prevent preterm birth. This end point is unreasonable. It is analogous to suggesting that a thermometer should cure infection rather than. © 1992, Massachusetts Medical Society. All rights reserved.