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Purpose:  Transvaginal sonographic findings of an absent cervical gland area (CGA) and a short cervical length (CL) are frequently observed in patients with threatened preterm delivery. The present study aimed to clarify whether sonographic findings are due to active production of hyaluronic acid (HA) in the cervix.

journal of perinatal medicine

Correlation between an absence of cervical gland area on transvaginal sonography and cervical mucus hyaluronic acid levels in women with threatened preterm delivery