In vitro fertilization (IVF) is a common approach for women with blocked fallopian tubes or unexplained infertility and for men with very low sperm counts.

A husband and wife have arrived for their preprocedural interview.

The husband asks the nurse to explain what the procedure entails.

What is the nurse's most appropriate response?

Choice A rationale

Abnormal uterine bleeding (AUB) is a broad term encompassing any deviation from normal menstrual bleeding patterns, including variations in frequency, regularity, duration, and volume. While amenorrhea is a type of AUB, AUB itself is a general category, not the specific term for absence of menses.

Choice B rationale

Amenorrhea refers to the absence of menstruation. Primary amenorrhea is when menstruation has not begun by a certain age, while secondary amenorrhea is the cessation of menstruation for three or more consecutive cycles or six months in a woman who previously menstruated. It is due to various physiological or pathological causes.

Choice C rationale

Oligomenorrhea describes infrequent menstruation, characterized by menstrual cycles lasting longer than 35 days but less than 90 days. This condition indicates an irregular pattern of menstruation rather than a complete absence, often linked to hormonal imbalances or anovulation.

Choice D rationale

Dysmenorrhea refers to painful menstruation, characterized by cramping pain in the lower abdomen that may radiate to the back or thighs. This symptom is related to uterine contractions mediated by prostaglandins during the menstrual period, not the absence of bleeding.

Choice A rationale

Dominant genetic diseases are not limited by sex; both males and females have an equal chance of inheriting and expressing the disease if they receive the dominant allele. Therefore, stating that only boys get dominant diseases is scientifically incorrect and does not reflect the principles of Mendelian inheritance for dominant traits.

Choice B rationale

Huntington's chorea is an autosomal dominant disorder. For a child to inherit an autosomal dominant disorder, at least one parent must have the affected gene. Since neither the woman nor her husband have or carry the gene for Huntington's chorea, their child cannot inherit the disease. This negates any 50% chance.

Choice C rationale

Huntington's chorea is an autosomal dominant disorder, meaning only one copy of the affected gene is needed for the disease to manifest. Since the pregnant woman and her husband do not have or carry the gene for Huntington's chorea, there is no possibility for them to pass the gene on to their child. The child will therefore not inherit the disease.

Choice D rationale

For an autosomal dominant disorder like Huntington's chorea, if a person does not have the gene, they cannot be a carrier in the traditional sense of recessive disorders. Carrying implies having a recessive gene without expressing it. Since the parents do not have the gene, the child cannot be affected through parental inheritance.