A patient is beginning fertility treatments for in vitro fertilization (IVF). The provider explains that they will give her which of the following medications to help develop ovarian follicles into mature ovum?

Choice A rationale

At 22 weeks of gestation, a fetus's lungs are still immature and typically lack sufficient amounts of surfactant. Surfactant is a crucial lipoprotein that reduces surface tension within the alveoli, preventing their collapse upon exhalation and facilitating gas exchange. Without adequate surfactant, the lungs struggle to remain open, leading to severe respiratory distress syndrome and making extrauterine survival highly challenging.

Choice B rationale

Lung damage at 22 weeks gestation is primarily due to immaturity, specifically the lack of surfactant and incompletely developed alveolar structures. Surgical intervention is not the primary treatment for this developmental immaturity. Medical management, such as surfactant administration and respiratory support, is the standard approach to support lung function in premature infants, not surgical repair.

Choice C rationale

Infants at 22 weeks gestation are far from fully formed and are considered extremely premature. Their organ systems, particularly the respiratory, neurological, and gastrointestinal systems, are significantly immature. They require extensive medical assistance, including respiratory support, nutritional support, and often specialized care in a neonatal intensive care unit (NICU) to survive, contradicting the idea of minimal assistance.

Choice D rationale

While survival rates for infants born at 22 weeks are very low, stating that a 22-week-old baby would *never* survive is an absolute and inaccurate statement. With advances in neonatal intensive care, including improved respiratory support, surfactant therapy, and nutritional strategies, some infants born at this gestational age do survive, although they often face significant long-term health challenges.

Choice A rationale

Pregnancy is the most common cause of secondary amenorrhea, especially in a sexually active woman experiencing a sudden cessation of menstruation for eight weeks. A positive pregnancy test indicates the presence of human chorionic gonadotropin (hCG), a hormone produced by the developing placenta, which is the biological marker for pregnancy.

Choice B rationale

While excessive exercise can cause amenorrhea due to disruption of the hypothalamic-pituitary-ovarian axis and low energy availability, it is a less common and usually chronic cause compared to pregnancy, especially when the amenorrhea is recent in onset. This would be a secondary consideration after ruling out pregnancy.

Choice C rationale

Endocrine disorders like polycystic ovary syndrome (PCOS), thyroid dysfunction, or hyperprolactinemia can lead to amenorrhea by interfering with hormonal regulation of the menstrual cycle. However, these are generally less frequent causes of acute amenorrhea than pregnancy and often present with other associated symptoms.

Choice D rationale

An ultrasound of the uterus can identify structural abnormalities or other gynecological conditions contributing to amenorrhea, such as Asherman's syndrome or uterine fibroids. However, for an acute presentation of amenorrhea, a pregnancy test is a more immediate and less invasive diagnostic tool to rule out the most common cause first.