RNC-OB –QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF.
CORE DOMAINS
• Fetal Assessment and Monitoring• Maternal Complications and High-Risk Pregnancy• Labor and Delivery
Management• Postpartum Care and Complications• Neonatal Transitions and Resuscitation• Professional
Issues, Ethics, and Safety• Obstetric Pharmacology• Physiological Adjustments to Pregnancy
INTRODUCTION
The purpose of this comprehensive RNC-OB examination is to evaluate the clinical proficiency and specialized
knowledge required for the Inpatient Obstetric Nursing certification. This assessment focuses on the critical
skills necessary to manage the complexities of the laboring patient, fetal surveillance, and postpartum recovery.
It consists of a rigorous series of multiple-choice and scenario-based questions designed to test real-world
application and clinical decision-making. By emphasizing evidence-based practice and safety standards, the
exam ensures that the candidate can effectively manage both low-risk and high-risk obstetric populations while
maintaining ethical and legal standards within the nursing profession.
SECTION ONE: QUESTIONS 1–100
1. A patient at 38 weeks gestation presents with a sudden onset of sharp abdominal pain followed by dark
red vaginal bleeding. Her abdomen is rigid and tender to palpation. Which condition should the nurse
suspect?
A. Placenta previa
B. Abruptio placentae
C. Uterine rupture
D. Vasa previa
🟢 Correct answer: B. Abruptio placentae
🔴 RATIONALE: Placental abruption is characterized by painful vaginal bleeding, uterine tenderness, and a
,"board-like" or rigid abdomen. Placenta previa is typically painless, while uterine rupture often involves a loss of
fetal station and a change in uterine contour.
2. During a nonstress test (NST), the nurse observes two fetal heart rate accelerations of 15 beats per
minute above baseline lasting at least 15 seconds within a 20-minute period. How should this be
documented?
A. Reactive NST
B. Nonreactive NST
C. Equivocal NST
D. Unsatisfactory NST
🟢 Correct answer: A. Reactive NST
🔴 RATIONALE: A reactive NST for a fetus at or beyond 32 weeks gestation requires at least two accelerations
of 15 bpm above baseline for 15 seconds within a 20-minute window, indicating fetal well-being.
3. Which medication is considered the first-line treatment for preventing seizures in a patient with
preeclampsia with severe features?
A. Labetalol
B. Nifedipine
C. Magnesium sulfate
D. Diazepam
🟢 Correct answer: C. Magnesium sulfate
🔴 RATIONALE: Magnesium sulfate is the gold standard for seizure prophylaxis in preeclampsia. While
labetalol and nifedipine manage blood pressure, they do not provide the neuromuscular blockade necessary to
prevent eclamptic seizures.
4. A nurse is caring for a patient receiving an oxytocin infusion for labor induction. The fetal heart rate
monitor shows repetitive late decelerations. What is the priority nursing action?
,A. Increase the IV fluid rate
B. Reposition the patient to her side
C. Discontinue the oxytocin infusion
D. Administer oxygen via non-rebreather mask
🟢 Correct answer: C. Discontinue the oxytocin infusion
🔴 RATIONALE: While repositioning and fluids are important, the priority in the presence of repetitive late
decelerations (indicating uteroplacental insufficiency) during oxytocin administration is to stop the uterine
stimulant immediately to reduce uterine activity.
5. In the context of obstetric nursing ethics, the principle of "Beneficence" is best described as:
A. Respecting the patient's right to self-determination
B. The duty to do no harm to the patient
C. The obligation to act in the best interest of the patient
D. Providing equal care to all patients regardless of status
🟢 Correct answer: C. The obligation to act in the best interest of the patient
🔴 RATIONALE: Beneficence refers to the duty to act for the benefit of others. "Do no harm" is non-
maleficence, and self-determination refers to autonomy.
6. Which of the following is a classic clinical sign of magnesium sulfate toxicity?
A. Hyperreflexia
B. Increased respiratory rate
C. Decreased deep tendon reflexes
D. Hypertension
🟢 Correct answer: C. Decreased deep tendon reflexes
🔴 RATIONALE: Magnesium sulfate is a central nervous system depressant. Toxicity is manifested by the loss
of deep tendon reflexes (DTRs), respiratory depression, and eventually cardiac arrest.
, 7. A patient at 30 weeks gestation presents with a history of preterm labor. The provider orders a fetal
fibronectin (fFN) test. Which of the following would invalidate the results of this test?
A. The patient had intercourse 12 hours ago
B. The patient has a history of cerclage
C. The patient is in a side-lying position
D. The patient's blood pressure is 110/70
🟢 Correct answer: A. The patient had intercourse 12 hours ago
🔴 RATIONALE: Fetal fibronectin testing is sensitive to cervical manipulation. Intercourse, vaginal
examinations, or vaginal ultrasounds within 24 hours prior to the test can result in a false-positive result.
8. When interpreting a fetal heart rate tracing, a "Category III" tracing is characterized by:
A. Moderate variability and accelerations
B. Absent variability with recurrent late decelerations
C. Early decelerations with normal baseline
D. Minimal variability with no decelerations
🟢 Correct answer: B. Absent variability with recurrent late decelerations
🔴 RATIONALE: Category III tracings are abnormal and associated with fetal acid-base imbalance. They
require prompt intervention and are defined by absent variability plus recurrent late/variable decelerations or
bradycardia.
9. A laboring patient's membranes rupture, and the nurse notes a loop of the umbilical cord protruding from
the vagina. What is the immediate nursing intervention?
A. Perform a sterile vaginal exam and apply upward pressure to the presenting part
B. Attempt to push the cord back into the uterus
C. Place the patient in a High-Fowler's position
D. Cover the cord with a dry sterile gauze
| INSTANT DOWNLOAD PDF.
CORE DOMAINS
• Fetal Assessment and Monitoring• Maternal Complications and High-Risk Pregnancy• Labor and Delivery
Management• Postpartum Care and Complications• Neonatal Transitions and Resuscitation• Professional
Issues, Ethics, and Safety• Obstetric Pharmacology• Physiological Adjustments to Pregnancy
INTRODUCTION
The purpose of this comprehensive RNC-OB examination is to evaluate the clinical proficiency and specialized
knowledge required for the Inpatient Obstetric Nursing certification. This assessment focuses on the critical
skills necessary to manage the complexities of the laboring patient, fetal surveillance, and postpartum recovery.
It consists of a rigorous series of multiple-choice and scenario-based questions designed to test real-world
application and clinical decision-making. By emphasizing evidence-based practice and safety standards, the
exam ensures that the candidate can effectively manage both low-risk and high-risk obstetric populations while
maintaining ethical and legal standards within the nursing profession.
SECTION ONE: QUESTIONS 1–100
1. A patient at 38 weeks gestation presents with a sudden onset of sharp abdominal pain followed by dark
red vaginal bleeding. Her abdomen is rigid and tender to palpation. Which condition should the nurse
suspect?
A. Placenta previa
B. Abruptio placentae
C. Uterine rupture
D. Vasa previa
🟢 Correct answer: B. Abruptio placentae
🔴 RATIONALE: Placental abruption is characterized by painful vaginal bleeding, uterine tenderness, and a
,"board-like" or rigid abdomen. Placenta previa is typically painless, while uterine rupture often involves a loss of
fetal station and a change in uterine contour.
2. During a nonstress test (NST), the nurse observes two fetal heart rate accelerations of 15 beats per
minute above baseline lasting at least 15 seconds within a 20-minute period. How should this be
documented?
A. Reactive NST
B. Nonreactive NST
C. Equivocal NST
D. Unsatisfactory NST
🟢 Correct answer: A. Reactive NST
🔴 RATIONALE: A reactive NST for a fetus at or beyond 32 weeks gestation requires at least two accelerations
of 15 bpm above baseline for 15 seconds within a 20-minute window, indicating fetal well-being.
3. Which medication is considered the first-line treatment for preventing seizures in a patient with
preeclampsia with severe features?
A. Labetalol
B. Nifedipine
C. Magnesium sulfate
D. Diazepam
🟢 Correct answer: C. Magnesium sulfate
🔴 RATIONALE: Magnesium sulfate is the gold standard for seizure prophylaxis in preeclampsia. While
labetalol and nifedipine manage blood pressure, they do not provide the neuromuscular blockade necessary to
prevent eclamptic seizures.
4. A nurse is caring for a patient receiving an oxytocin infusion for labor induction. The fetal heart rate
monitor shows repetitive late decelerations. What is the priority nursing action?
,A. Increase the IV fluid rate
B. Reposition the patient to her side
C. Discontinue the oxytocin infusion
D. Administer oxygen via non-rebreather mask
🟢 Correct answer: C. Discontinue the oxytocin infusion
🔴 RATIONALE: While repositioning and fluids are important, the priority in the presence of repetitive late
decelerations (indicating uteroplacental insufficiency) during oxytocin administration is to stop the uterine
stimulant immediately to reduce uterine activity.
5. In the context of obstetric nursing ethics, the principle of "Beneficence" is best described as:
A. Respecting the patient's right to self-determination
B. The duty to do no harm to the patient
C. The obligation to act in the best interest of the patient
D. Providing equal care to all patients regardless of status
🟢 Correct answer: C. The obligation to act in the best interest of the patient
🔴 RATIONALE: Beneficence refers to the duty to act for the benefit of others. "Do no harm" is non-
maleficence, and self-determination refers to autonomy.
6. Which of the following is a classic clinical sign of magnesium sulfate toxicity?
A. Hyperreflexia
B. Increased respiratory rate
C. Decreased deep tendon reflexes
D. Hypertension
🟢 Correct answer: C. Decreased deep tendon reflexes
🔴 RATIONALE: Magnesium sulfate is a central nervous system depressant. Toxicity is manifested by the loss
of deep tendon reflexes (DTRs), respiratory depression, and eventually cardiac arrest.
, 7. A patient at 30 weeks gestation presents with a history of preterm labor. The provider orders a fetal
fibronectin (fFN) test. Which of the following would invalidate the results of this test?
A. The patient had intercourse 12 hours ago
B. The patient has a history of cerclage
C. The patient is in a side-lying position
D. The patient's blood pressure is 110/70
🟢 Correct answer: A. The patient had intercourse 12 hours ago
🔴 RATIONALE: Fetal fibronectin testing is sensitive to cervical manipulation. Intercourse, vaginal
examinations, or vaginal ultrasounds within 24 hours prior to the test can result in a false-positive result.
8. When interpreting a fetal heart rate tracing, a "Category III" tracing is characterized by:
A. Moderate variability and accelerations
B. Absent variability with recurrent late decelerations
C. Early decelerations with normal baseline
D. Minimal variability with no decelerations
🟢 Correct answer: B. Absent variability with recurrent late decelerations
🔴 RATIONALE: Category III tracings are abnormal and associated with fetal acid-base imbalance. They
require prompt intervention and are defined by absent variability plus recurrent late/variable decelerations or
bradycardia.
9. A laboring patient's membranes rupture, and the nurse notes a loop of the umbilical cord protruding from
the vagina. What is the immediate nursing intervention?
A. Perform a sterile vaginal exam and apply upward pressure to the presenting part
B. Attempt to push the cord back into the uterus
C. Place the patient in a High-Fowler's position
D. Cover the cord with a dry sterile gauze
