A nurse is caring for a client who is at 37 weeks of gestation and has placenta previa. The client asks the nurse why the provider does not do an internal examination. Which of the following explanations of the primary reason should the nurse provide?

A. There is an increased risk of introducing infection. While aseptic technique is vital in obstetric care, the primary contraindication for internal exams in placenta previa is not related to microbial entry. Digital manipulation of the vaginal vault is avoided because of immediate mechanical risks to the placental structure. Infection control is secondary to the prevention of catastrophic maternal hemorrhage in this high-risk scenario. B. There is an increased risk of rupture of the membranes. Premature rupture of membranes is a clinical concern during any pregnancy, but it is not the life-threatening complication associated with placenta previa examinations. A digital exam could inadvertently puncture the amniotic sac, but the vascular implications are far more severe. The focus of the "no vaginal exam" rule is strictly the avoidance of the low-lying placenta. C. This could result in heavy amount of bleeding. Placenta previa involves the implantation of the placenta over or near the cervical os, where the tissue is highly vascular and fragile. Digital palpation can trigger massive, painless bright red bleeding by dislodging the placenta from the uterine wall. This creates an obstetric emergency that jeopardizes both maternal and fetal hemodynamics through rapid exsanguination. D. This could initiate preterm labor. Although cervical stimulation can occasionally trigger uterine contractions, this is not the fundamental reason for avoiding internal exams in this patient. Preterm labor is a manageable complication compared to the risk of uncontrollable placental hemorrhage. Protecting the integrity of the placental attachment site is the essential priority for a client at 37 weeks gestation.