Normative Values of Mid Trimester Cervical Consistency Index in Women Delivering at Term

ims and Objective Cervical Consistency Index (CCI) is a new technique to measure the consistency of Cervix (softening) and is expected to show changes before cervical shortening. The aim of this study was 1. To find out the normative values of mid-trimester Cervical Consistency Index in women delivering at term. 2. To compare the discriminative ability of cervical consistency index with cervical length for prediction of spontaneous preterm birth. Method A total of 144 antenatal patients undergoing mid-trimester anomaly scan were subjected to transvaginal cervical length measurement as per Fetal Medicine Foundation criteria. Cervical consistency index was measured as defined by Para et al. The anterior–posterior diameter of cervix was measured before compression (AP) and after compression (AP') in the same sitting. Cervical consistency index (CCI) was calculated by the formula: CCI = AP^' /AP×100. The result of CCI was not used in the clinical management of the patient. Women who delivered at 37 weeks and beyond were included to form the normative data. An attempt was made to study the ability of mid-trimester cervical consistency index to predict spontaneous preterm birth as compared to cervical length (CL). Results Range of CCI in our study was 41–100