Does occurrence of postmenopausal-like acidic follicle-stimulating hormone ( FSH ) isoforms precede the rise of FSH before menopause?
The occurrence of postmenopausal-like acidic FSH isoforms precedes the rise of FSH before menopause.
A cervical length<25 mm on transvaginal sonographic assessment rarely occurs before 14 weeks even in high-risk patients destined to deliver preterm; in these patients cervical changes predictive of preterm birth develop mostly after this gestational age.