• Threatened abortion is framed as a modifiable clinical syndrome with salvage strategies and hormone-based prognostic approaches, as shown across multiple case-series. Evidence includes salvage in threatened abortion [2], management of threatened abortion [9], prognosis using pregnanediol and progesterone [12], and overall pregnancy outcomes [16].

• Habitual abortion is frequently attributed to cervical incompetence; diagnostic focus centers on the internal os, with radiographic demonstration and targeted surgical management discussed in multiple reports [6], [13], [4], [1].

• Endocrine and hormonal milieu are explored as determinants: progesterone, pregnanediol, thyroid/iodine status, and endocrine patterns linked to abortion risk and post-abortion physiology [5], [12], [8], [15], [17].

• Fetal environment and outcomes are studied via congenital malformation incidence and associations with fetal milieu such as iodine status and threatened abortion relationships [18], [20], [15], [16].

• Maternal health factors and comorbidity influence abortion-related obstetric outcomes, including chronic ulcerative colitis, cardiac disease during pregnancy, and broader planning contexts [14], [19], [10].