The Use of Cervical Length to Reduce Hospital Stay in Women Admitted Because of Preterm Labor.

Eligible women who agreed to participate in the study were randomized by means of a central randomization office into two groups: CONTROL group: cervical length was measured but the result was blinded to the physician in charge and women was managed according to the standard protocol. STUDY group: cervical length was measured and the result was reported to the physician in charge. If cervical length was of 25 mm or more, discharge in 12-24 h was recommended. If cervical length was less than 25 mm, decision on discharge was made following clinical criteria.