A pregnant woman undergoes a triple/quadruple screen at 16 to 18 weeks' gestation. What would the nurse suspect if the woman's alpha-fetoprotein (AFP) level is decreased?

Choice A Reason: This is incorrect because sickle-cell anemia is a genetic disorder that affects the shape and function of red blood cells. It does not affect the AFP level, which is a protein produced by the fetus and placenta. Sickle-cell anemia can be detected by other prenatal tests, such as hemoglobin electrophoresis or DNA analysis.

Choice B Reason: This is incorrect because cardiac defects are structural abnormalities of the heart or blood vessels that affect the blood flow and oxygen delivery to the fetus. They may cause an increased AFP level, not a decreased one, as they can lead to fetal distress or edema. Cardiac defects can be detected by other prenatal tests, such as fetal echocardiography or ultrasound.

Choice C Reason: This is correct because Down syndrome is a chromosomal disorder that results from an extra copy of chromosome 21. It causes various physical and mental developmental delays and defects in the fetus. It is associated with a decreased AFP level, as well as decreased levels of human chorionic gonadotropin (hCG) and unconjugated estriol (uE3). Down syndrome can be confirmed by other prenatal tests, such as amniocentesis or chorionic villus sampling (CVS).

Choice D Reason: This is incorrect because respiratory disorders are problems that affect the breathing and gas exchange of the fetus. They may cause an increased AFP level, not a decreased one, as they can lead to fetal distress or edema. Respiratory disorders can be detected by other prenatal tests, such as fetal biophysical profile (BPP) or nonstress test (NST).

Choice A Reason: This is incorrect because ambivalence is a mixed or contradictory feeling towards something or someone. It may occur in some women during pregnancy, especially if the pregnancy was unplanned or unwanted. However, it is not the most likely emotional response in the first trimester.

Choice B Reason: This is correct because emotional lability is a rapid and exaggerated change in mood or affect. It may occur in many women during pregnancy due to hormonal fluctuations, physical changes, and psychological stressors. Emotional lability may manifest as increased irritability, anxiety, sadness, or crying spells.

Choice C Reason: This is incorrect because introversion is a personality trait that indicates a preference for solitude and inward focus. It may be present in some women before or during pregnancy, but it is not an emotional response that is specific to the first trimester.

Choice D Reason: This is incorrect because acceptance is a positive attitude that indicates a willingness to embrace the reality of something or someone. It may develop in some women during pregnancy as they adjust to their new role and identity as mothers. However, it is not the most likely emotional response in the first trimester.