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The diagnosis of fetal infection, other than in association with premature rupture of the membranes, requires the evaluation of various parameters. Children suspected are four to five times greater in number than those truly threatened. A new and important parameter has emerged as a result of tocokinetic investigation: in one case out of two 48 hours before birth and in three cases out of four during the day before birth, fetal motility, together with cardiac reactivity or not, appear to be very markedly decreased when the newborn will in fact be found to be infected. Tocokinetic study is thus a new source of help in the obstetric/pediatric decisions which must be taken in this context.

Premature breaking of the membranes carries with it a serious risk of immediate or delayed ovular infection which compromises the prognosis. No diagnostic test with an acceptable error level was available to reduce the morbidity and mortality, in particular prior to 37 weeks of amenorrhea. The oligoamnios which accompanies the rupture increases the accuracy of the tocokinetic diagnosis, thus permitting a new and rigorous treatment in function of the stage of the pregnancy and the possibility of artificially inducing labor.