Correct Answer: C

Rationale: An L/S ratio of 2:1 indicates fetal lung maturity, as it signifies the presence of surfactant in the amniotic fluid, which helps with lung expansion and prevents collapse at the end of expiration. The absence of PG indicates immaturity of the fetal lungs, as PG appears in the amniotic fluid during the later stages of lung maturation. Biophysical profile scores and nonstress tests are assessments of fetal well-being and do not directly indicate fetal lung maturity. Therefore, choice C is the correct answer.

Correct Answer: D

Rationale: The correct sequence of maternal changes during pregnancy is as follows: Amenorrhea (absence of menstrual periods), Goodell's sign (softening of the cervix), Quickening (first fetal movements felt by the mother), and Lightening (baby descending into the pelvis). These changes occur at different stages of pregnancy and are important indicators of fetal development and maternal adaptation. Choice A is correct as it is the initial change indicating possible pregnancy. Choices B, C, and D follow in the correct order of occurrence during pregnancy. Choices B, C, and D are incorrect as they do not follow the correct sequence of maternal changes.

Correct Answer: A

Rationale: The maternal serum alpha-fetoprotein (MSAFP) test is performed around 15-18 weeks of gestation to screen for neural tube defects and other developmental abnormalities in the fetus, not to assess fetal lung maturity, markers of fetal well-being, or Rh incompatibility between the mother and fetus. Choice A is the correct answer as it accurately reflects the purpose of the MSAFP test. Choices B, C, and D are incorrect because they do not align with the primary goal of this screening test.

Correct Answer: A

Rationale: The priority nursing intervention in this situation is to palpate the client's uterine fundus. A boggy uterus that is not well contracted may indicate uterine atony, which can lead to postpartum hemorrhage. Palpating the fundus and massaging it if it is boggy helps to promote contractions and reduce bleeding, making it the most critical intervention to address the potential underlying issue. Assisting the client to a bedpan to urinate, preparing to administer oxytocic medication, or increasing the client's fluid intake are not the immediate priorities in this scenario compared to assessing and addressing the uterine fundus status.

Correct Answer: B

Rationale: Methylergonovine is used to prevent or treat postpartum hemorrhage by contracting the uterus. A firm fundus indicates effective uterine contraction and less bleeding. Therefore, the correct answer is a firm fundus to palpation. The increase in blood pressure (Choice A) is not a typical finding associated with the effectiveness of methylergonovine. Increase in lochia (Choice C) may indicate excessive bleeding rather than the medication's effectiveness. Absence of breast pain (Choice D) is not directly related to the medication's effectiveness in treating postpartum hemorrhage.