A nurse is caring for a client who has bulimia nervosa. Which of the following actions should the nurse take first?

The correct answer is D.

Chadwick's sign. Chadwick's sign is a bluish discoloration of the cervix, vagina, and vulva caused by increased blood flow to these areas during pregnancy. It usually appears around 6 to 8 weeks of gestation and persists until delivery. It is one of the presumptive signs of pregnancy, which are subjective changes that suggest pregnancy but are not conclusive. Ballottement is a technique of palpating the uterus to detect fetal movement when a finger is inserted into the vagina and tapped against the cervix. It can be performed between 16 and 28 weeks of gestation and is also a presumptive sign of pregnancy.

Chloasma is a condition characterized by brown patches on the face that may occur during pregnancy due to hormonal changes. It is also known as melasma or mask of pregnancy and usually fades after delivery. Hegar's sign is a softening of the lower uterine segment that can be felt during bimanual examination around 6 weeks of gestation. It is one of the probable signs of pregnancy, which are objective changes that strongly indicate pregnancy but are not diagnostic.

The correct answer is B. Notify the charge nurse about the situation. Informed consent is when a healthcare provider explains a medical treatment to a patient before the patient agrees to it. The patient has the right to know their state of health, the diagnosis, and the treatments available, and to choose any alternative. The nurse is responsible for obtaining consent when initiating care, and reviewing consent before providing the care ordered by another health care professional. If the patient does not understand why the procedure is necessary, the nurse should notify the charge nurse or the physician who ordered the procedure, so that they can provide more information and answer any questions.

The nurse should not ask the client to sign the consent form anyway (A), as this would violate the patient's right to autonomy and self-determination.

The nurse should not remind the client about the specifics of the procedure (C) or explain to the client that the procedure will help treat his diagnosis (D), as these are not within the nurse's scope of practice and may be considered as giving medical advice.