• Endocrine regulation of the menstrual cycle and pregnancy is approached through urinary excretion markers (pregnanediol glucuronide, estrogens/androgens) and internal secretions, enabling longitudinal hormonal profiling across cycle phases and labor; this methodology is demonstrated across corpus luteum studies, urinary hormone excretion, and pregnancy metabolism ([2], [4], [6], [15], [17], [18]).

• Circulatory and hemodynamic studies in pregnancy unify physiological measurements (blood flow velocity, circulation patterns) with pregnancy outcomes, reflecting a paradigm that links vascular dynamics to maternal-fetal health and hypertensive risk ([1], [3], [19]).

• Pathology-driven understanding of uterine and endometrial health emphasizes endometrial hyperplasia, abortion risk, uterine anomalies, and rupture as central obstetric concerns, derived from clinical and surgical reports ([5], [7], [9], [10], [11], [12]).

• Temporal framing of reproductive biology centers on ovulation timing and menstrual rhythm, employing time-to-event and cycle data alongside urinary/metabolic markers to map cycle structure and fertility windows ([2], [4], [6], [13], [16], [17], [18]).

• Late-pregnancy endocrine shifts and toxemia are examined via internal secretions and metabolic profiles, highlighting hormonal contributions to maternal complications and labor physiology ([14], [15]).