INPATIENT OBSTETRIC NURSING CERTIFICATION (RNC-OB) QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES | LATEST VERSION PDF
SECTION ONE: QUESTIONS 1–100
Which fetal heart rate pattern is most concerning and requires immediate intrauterine
resuscitation?
A. Early decelerations
B. Variable decelerations
C. Recurrent late decelerations
D. Accelerations
🟢 C. Recurrent late decelerations
🔴 RATIONALE: Recurrent late decelerations indicate uteroplacental insufficiency and are
associated with fetal hypoxia and acidemia, requiring immediate intervention.
A patient at 32 weeks gestation presents with vaginal bleeding. What is the priority nursing action?
A. Perform a sterile vaginal exam
B. Assess fetal heart tones
C. Insert an internal uterine pressure catheter
D. Administer oxytocin
🟢 B. Assess fetal heart tones
🔴 RATIONALE: Assessment of fetal well-being is the priority. Vaginal exams are contraindicated
until placenta previa is ruled out via ultrasound.
Which medication is the standard of care for seizure prophylaxis in preeclampsia?
A. Labetalol
B. Nifedipine
C. Magnesium sulfate
D. Hydralazine
,🟢 C. Magnesium sulfate
🔴 RATIONALE: Magnesium sulfate acts as a central nervous system depressant to prevent
eclamptic seizures in patients with preeclampsia.
What is the primary purpose of an amniotomy?
A. To decrease uterine tone
B. To augment labor
C. To prevent cord prolapse
D. To induce preterm labor
🟢 B. To augment labor
🔴 RATIONALE: Amniotomy is performed to artificially rupture membranes, which can help
stimulate labor progression by releasing prostaglandins.
Which laboratory finding is consistent with HELLP syndrome?
A. Elevated platelets
B. Decreased liver enzymes
C. Hemolysis
D. Normal uric acid
🟢 C. Hemolysis
🔴 RATIONALE: HELLP syndrome is characterized by Hemolysis, Elevated Liver enzymes, and
Low Platelets.
A laboring patient reports a sudden, sharp abdominal pain followed by the cessation of
contractions. What is the suspected diagnosis?
A. Placental abruption
B. Uterine rupture
C. Vasa previa
,D. Preterm labor
🟢 B. Uterine rupture
🔴 RATIONALE: Sudden cessation of contractions accompanied by sharp pain is a classic, though
severe, sign of uterine rupture.
What is the recommended position for a patient with a prolapsed umbilical cord?
A. Supine
B. Trendelenburg
C. Lateral recumbent
D. Semi-Fowler
🟢 B. Trendelenburg
🔴 RATIONALE: The Trendelenburg position (or knee-chest) uses gravity to shift the fetal
presenting part away from the umbilical cord.
Which hormone is primarily responsible for maintaining the corpus luteum in early pregnancy?
A. Progesterone
B. Human Chorionic Gonadotropin (hCG)
C. Estrogen
D. Oxytocin
🟢 B. Human Chorionic Gonadotropin (hCG)
🔴 RATIONALE: hCG is produced by the trophoblast and maintains the corpus luteum until the
placenta takes over progesterone production.
A patient is at 39 weeks gestation with Category II tracing. Which intervention is most appropriate?
A. Immediate cesarean section
B. Amnioinfusion
C. Maternal position change
, D. Administration of terbutaline
🟢 C. Maternal position change
🔴 RATIONALE: Changing the mother's position is a non-invasive first-line nursing intervention to
improve placental perfusion for Category II tracings.
What defines "active labor" in current clinical guidelines?
A. 0-3 cm dilation
B. 6 cm dilation and beyond
C. Regular contractions every 10 minutes
D. Effacement only
🟢 B. 6 cm dilation and beyond
🔴 RATIONALE: Modern clinical guidelines classify 6 cm as the threshold for active labor to
standardize management and reduce unnecessary interventions.
Which of the following is a sign of magnesium toxicity?
A. Hypertension
B. Loss of deep tendon reflexes
C. Increased urine output
D. Tachycardia
🟢 B. Loss of deep tendon reflexes
🔴 RATIONALE: Magnesium sulfate depresses the central nervous system; a decrease or loss of
deep tendon reflexes is an early sign of toxicity.
The "fetal station" refers to:
A. The position of the fetal back
B. The level of the presenting part in relation to the ischial spines
C. The degree of cervical effacement
ANSWERS WITH DETAILED RATIONALES | LATEST VERSION PDF
SECTION ONE: QUESTIONS 1–100
Which fetal heart rate pattern is most concerning and requires immediate intrauterine
resuscitation?
A. Early decelerations
B. Variable decelerations
C. Recurrent late decelerations
D. Accelerations
🟢 C. Recurrent late decelerations
🔴 RATIONALE: Recurrent late decelerations indicate uteroplacental insufficiency and are
associated with fetal hypoxia and acidemia, requiring immediate intervention.
A patient at 32 weeks gestation presents with vaginal bleeding. What is the priority nursing action?
A. Perform a sterile vaginal exam
B. Assess fetal heart tones
C. Insert an internal uterine pressure catheter
D. Administer oxytocin
🟢 B. Assess fetal heart tones
🔴 RATIONALE: Assessment of fetal well-being is the priority. Vaginal exams are contraindicated
until placenta previa is ruled out via ultrasound.
Which medication is the standard of care for seizure prophylaxis in preeclampsia?
A. Labetalol
B. Nifedipine
C. Magnesium sulfate
D. Hydralazine
,🟢 C. Magnesium sulfate
🔴 RATIONALE: Magnesium sulfate acts as a central nervous system depressant to prevent
eclamptic seizures in patients with preeclampsia.
What is the primary purpose of an amniotomy?
A. To decrease uterine tone
B. To augment labor
C. To prevent cord prolapse
D. To induce preterm labor
🟢 B. To augment labor
🔴 RATIONALE: Amniotomy is performed to artificially rupture membranes, which can help
stimulate labor progression by releasing prostaglandins.
Which laboratory finding is consistent with HELLP syndrome?
A. Elevated platelets
B. Decreased liver enzymes
C. Hemolysis
D. Normal uric acid
🟢 C. Hemolysis
🔴 RATIONALE: HELLP syndrome is characterized by Hemolysis, Elevated Liver enzymes, and
Low Platelets.
A laboring patient reports a sudden, sharp abdominal pain followed by the cessation of
contractions. What is the suspected diagnosis?
A. Placental abruption
B. Uterine rupture
C. Vasa previa
,D. Preterm labor
🟢 B. Uterine rupture
🔴 RATIONALE: Sudden cessation of contractions accompanied by sharp pain is a classic, though
severe, sign of uterine rupture.
What is the recommended position for a patient with a prolapsed umbilical cord?
A. Supine
B. Trendelenburg
C. Lateral recumbent
D. Semi-Fowler
🟢 B. Trendelenburg
🔴 RATIONALE: The Trendelenburg position (or knee-chest) uses gravity to shift the fetal
presenting part away from the umbilical cord.
Which hormone is primarily responsible for maintaining the corpus luteum in early pregnancy?
A. Progesterone
B. Human Chorionic Gonadotropin (hCG)
C. Estrogen
D. Oxytocin
🟢 B. Human Chorionic Gonadotropin (hCG)
🔴 RATIONALE: hCG is produced by the trophoblast and maintains the corpus luteum until the
placenta takes over progesterone production.
A patient is at 39 weeks gestation with Category II tracing. Which intervention is most appropriate?
A. Immediate cesarean section
B. Amnioinfusion
C. Maternal position change
, D. Administration of terbutaline
🟢 C. Maternal position change
🔴 RATIONALE: Changing the mother's position is a non-invasive first-line nursing intervention to
improve placental perfusion for Category II tracings.
What defines "active labor" in current clinical guidelines?
A. 0-3 cm dilation
B. 6 cm dilation and beyond
C. Regular contractions every 10 minutes
D. Effacement only
🟢 B. 6 cm dilation and beyond
🔴 RATIONALE: Modern clinical guidelines classify 6 cm as the threshold for active labor to
standardize management and reduce unnecessary interventions.
Which of the following is a sign of magnesium toxicity?
A. Hypertension
B. Loss of deep tendon reflexes
C. Increased urine output
D. Tachycardia
🟢 B. Loss of deep tendon reflexes
🔴 RATIONALE: Magnesium sulfate depresses the central nervous system; a decrease or loss of
deep tendon reflexes is an early sign of toxicity.
The "fetal station" refers to:
A. The position of the fetal back
B. The level of the presenting part in relation to the ischial spines
C. The degree of cervical effacement
