The RNC-OB (Inpatient Obstetric Nursing) is a nursing certification awarded by NCC.
NCC publishes the official exam outline, eligibility rules and fees — see NCC's official page before you book.
Twenty RNC-OB (Inpatient Obstetric Nursing) questions, with the answers hidden until you want them — covering Pathology, Management, Assessment, Pharmacology and more. They are real cards from our 1050-card deck, not the 30 on the free preview page, so you can use both. Work through them cold, then use your score below to decide what to study next. NCC publishes the official exam outline — check it for the real blueprint.
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A patient at 18 weeks gestation presents with a BP of 148/94. She has no prior history of hypertension. Based on the timing of this finding, how is this most likely classified?
Show answer →Chronic Hypertension (CHTN). Key diagnostic timing: HTN diagnosed <20 weeks or pre-pregnancy is CHTN. Gestational Hypertension (GHTN) occurs ≥20 weeks. RNC-OB Tip: If BP remains elevated >12 weeks postpartum, the diagnosis of CHTN is confirmed. Distinguish from transient hypertension of pregnancy, which is a retrospective diagnosis. NCC exams emphasize the 20-week threshold to differentiate pre-existing from pregnancy-induced conditions.
A patient with Chronic Hypertension (CHTN) at 32 weeks presents with a sudden increase in BP from 130/80 to 160/105 and new-onset proteinuria. What is the most likely diagnosis?
Show answer →Superimposed Preeclampsia. This is characterized by a sudden increase in BP that was previously well-controlled, or the new onset of proteinuria or other systemic features (e.g., low platelets, elevated LFTs) in a patient with pre-existing CHTN. RNC-OB Tip: Superimposed preeclampsia carries significantly higher risks for placental abruption and IUGR than CHTN or GHTN alone and often necessitates earlier delivery. Look for change in baseline on the exam.
Which medication is recommended for initiation between 12 and 28 weeks gestation for a patient with Chronic Hypertension to reduce the risk of preeclampsia?
Show answer →Low-dose Aspirin (81 mg/day; some 2026 protocols suggest 162 mg for high-risk). Aspirin should ideally start before 16 weeks. RNC-OB Tip: CHTN is a high-risk factor, making aspirin prophylaxis a Grade A recommendation by ACOG/USPSTF. NCC exams focus on prophylactic measures to improve outcomes. Ensure the patient has no contraindications like NSAID-sensitive asthma or active GI bleeding.
A patient with Chronic Hypertension (CHTN) on Labetalol has a baseline protein-to-creatinine (P/C) ratio of 0.2. At 34 weeks, her P/C ratio is 0.4. She has no other symptoms. Is this diagnostic of superimposed preeclampsia?
Show answer →Yes. In a patient with pre-existing CHTN, a new onset of proteinuria (P/C ratio ≥0.3 or >300mg/24h) or a significant increase from baseline indicates superimposed preeclampsia. RNC-OB Tip: If proteinuria was present at baseline, look for a sudden doubling of protein or the development of severe features (BP >160/110, low platelets, etc.) to confirm the diagnosis. NCC questions often use P/C ratios rather than just dipsticks.
How long must hypertension persist postpartum for the diagnosis to be changed from Gestational Hypertension to Chronic Hypertension?
Show answer →12 weeks (3 months). If BP returns to normal before 12 weeks postpartum, the diagnosis remains GHTN. If it remains ≥140/90 after 12 weeks, it is classified as CHTN. RNC-OB Tip: This retrospective diagnosis is a common exam point regarding postpartum follow-up and long-term cardiovascular health. Patients with GHTN have a higher lifetime risk of CV disease and should be counseled accordingly.
A patient at 34 weeks has BP 145/94. Urine dipstick is negative. What additional systemic findings would allow for a diagnosis of preeclampsia in this patient according to current guidelines?
Show answer →In the absence of proteinuria, preeclampsia is diagnosed with HTN and any of the following: Platelets < 100,000; Serum creatinine > 1.1 mg/dL or doubling; Liver transaminases 2x normal; Pulmonary edema; New-onset cerebral/visual disturbances. Exam Tip: NCC focuses on the systemic nature of the disease; proteinuria is no longer mandatory for diagnosis if other severe features are present.
A G1P0 at 36 weeks presents with BP 172/114, headache, and 3+ proteinuria. Per 2026 standards, what is the initial management priority for blood pressure control and the target range?
Show answer →Immediate goal: Reduce BP to 140-150/90-100 mmHg within 30-60 minutes to prevent maternal stroke. First-line agents: IV Labetalol (20mg, then 40-80mg every 10 min) or IV Hydralazine (5-10mg every 20 min). Oral Nifedipine (10-20mg) is a preferred oral alternative. Clinical Pearl: Do not drop BP too low or too fast, as this can cause placental hypoperfusion and non-reassuring FHR. Exam Tip: NCC emphasizes that severe BP is 160/110+ on two occasions 15 mins apart, but treatment should NOT be delayed if initial BP is extremely high. Avoid Labetalol in patients with asthma or active CHF.
A patient on Magnesium Sulfate (4g loading, 2g/hr maintenance) has a respiratory rate of 10/min, absent patellar reflexes, and urine output of 20mL/hr. What is the priority nursing action?
Show answer →1. STOP the Magnesium Sulfate infusion immediately. 2. Administer Calcium Gluconate (1g IV over 5-10 mins). Rational: MgSO4 is renally excreted; oliguria (<30mL/hr) leads to toxic accumulation. Toxic signs: Loss of DTRs (8-12 mg/dL), respiratory depression (12-15 mg/dL), and cardiac arrest (>25 mg/dL). Exam Tip: NCC often tests the sequence of interventions—always STOP the medication before administering the antagonist. Monitoring urine output is the most critical assessment for preventing toxicity.
A patient at 33 weeks gestation is diagnosed with preeclampsia with severe features (BP 168/112, platelets 90,000). What is the recommended timing for delivery according to ACOG/NCC guidelines?
Show answer →Delivery is indicated at 34 0/7 weeks for stable preeclampsia with severe features. However, immediate delivery is indicated regardless of gestational age for unstable conditions: eclampsia, pulmonary edema, placental abruption, DIC, or non-reassuring fetal status. Clinical Pearl: Expectant management between 24-34 weeks requires intensive maternal-fetal monitoring in a tertiary center. Exam Tip: Differentiate from preeclampsia WITHOUT severe features, where the delivery threshold is 37 0/7 weeks.
Following the initiation of a Magnesium Sulfate loading dose, the FHR monitor shows a decrease in baseline variability. There are no decelerations. What is the appropriate nursing interpretation?
Show answer →This is a known, transient effect of Magnesium Sulfate. MgSO4 crosses the placenta and acts as a CNS depressant in the fetus, often leading to decreased FHR variability and occasionally decreased frequency of accelerations. Clinical Pearl: This finding alone does not indicate fetal distress if the baseline is stable and decelerations are absent. Exam Tip: Distinguish between expected medication effects (decreased variability) and hypoxic effects (late decelerations). Do not suggest delivery for decreased variability caused by MgSO4.
A 34-week gestation patient presents with a BP of 162/112 mmHg. According to 2026 MEWS (Maternal Early Warning System) criteria, what is the required immediate action?
Show answer →SBP ≥160 or DBP ≥110 mmHg is a Red trigger requiring immediate bedside evaluation by a provider (MD/CNM) and preparation for antihypertensive administration (e.g., Labetalol or Hydralazine) within 30-60 minutes. Rationale: These values represent the threshold for hypertensive emergency and increased stroke risk in pregnancy. Exam Tip: NCC emphasizes the distinction between Yellow (cautionary) and Red (urgent action) triggers. For BP, 150s/100s are often yellow, while 160/110 is always red.
A postpartum patient (6 hours) presents with a Heart Rate of 125 bpm and Respiratory Rate of 26. Which MEWS category is triggered, and why?
Show answer →Both HR >120 bpm and RR >24 breaths/min are Red triggers. Rationale: Tachycardia and tachypnea are early, sensitive indicators of maternal decompensation, often preceding a drop in blood pressure in cases of postpartum hemorrhage (PPH) or pulmonary embolism (PE). Clinical Pearl: Do not wait for hypotension to escalate care; the compensated phase of shock in healthy young women is brief. NCC focuses on early recognition via these specific vital sign thresholds.
A patient at 30 weeks gestation is receiving Magnesium Sulfate. Her serum creatinine has risen from 0.8 to 1.4 mg/dL over 12 hours. How does this impact the Magnesium protocol?
Show answer →Magnesium is excreted 100% renally. Elevated creatinine (>1.1 mg/dL or doubling of baseline) indicates renal insufficiency, significantly increasing toxicity risk. The nurse MUST anticipate a dose reduction or discontinuation and request a serum magnesium level. Clinical Pearl: If kidneys cannot clear the drug, it accumulates rapidly. In cases of renal failure, the maintenance dose may be halved or eliminated, keeping only the loading dose for seizure prophylaxis.
What specific Fetal Heart Rate (FHR) changes are expected and considered normal in a patient receiving therapeutic Magnesium Sulfate?
Show answer →Expected changes include a decrease in FHR variability and a possible decrease in the frequency of accelerations. Rationale: This is due to the CNS depressant effect of Magnesium on the fetal brain. Clinical Pearl: While variability may decrease, it should not be absent (flat) solely due to Magnesium; persistent absent variability requires further assessment for fetal acidemia. Magnesium does not typically cause decelerations.
If a single fertilized ovum divides between days 4 and 8 post-conception, what are the resulting chorionicity and amnionicity?
Show answer →Monochorionic/Diamniotic (Mo/Di). Rationales: 0-3 days = Di/Di; 4-8 days = Mo/Di; 8-13 days = Mo/Mo; >13 days = Conjoined. Mo/Di is the most common form of monozygotic twins (~75%). NCC focus: Identification of risks based on timing of division. Risk for TTTS begins with monochorionicity.
Twin-to-Twin Transfusion Syndrome (TTTS) is a complication specific to which type of placentation, and what is the underlying physiological cause?
Show answer →Monochorionic (usually Mo/Di). Cause: Unbalanced deep vascular anastomoses (arteriovenous) in the shared placenta. This leads to a donor twin (hypovolemic, oliguria, oligohydramnios) and a recipient twin (hypervolemic, polyuria, polyhydramnios). NCC Focus: TTTS does NOT occur in Di/Di twins because they do not share a placenta or vascular connections.
A patient completes a 100g 3-hour OGTT. Results: Fasting 92, 1-hr 188, 2-hr 150, 3-hr 142. Using Carpenter-Coustan criteria (95/180/155/140), does this patient have GDM? What is the requirement for diagnosis in the Two-Step method?
Show answer →Yes, this patient meets the criteria for GDM. Under Carpenter-Coustan, the thresholds are: Fasting <95, 1-hr <180, 2-hr <155, 3-hr <140. This patient had abnormal 1-hour (188) and 3-hour (142) values. Diagnosis in the Two-Step method requires TWO or more elevations. If using NDDG criteria (105/190/165/145), this patient would NOT meet the criteria. NCC Tip: The exam may provide values and ask for a diagnosis; always check if the question specifies Carpenter-Coustan vs. NDDG, though CC is more common in modern practice.
A 20-week gestation patient presents with 3cm dilation and bulging membranes but no contractions. What are the priority assessments before an emergent rescue cerclage is attempted?
Show answer →Priority assessments: Rule out chorioamnionitis (fever, WBC, uterine tenderness), active labor (contractions), and PPROM. A sterile speculum exam and ultrasound are essential. Strategy: Rescue cerclage has higher risks (ROM, infection) than prophylactic. Pre-op management often includes Trendelenburg positioning and potentially an amnioreduction to reduce pressure on the membranes.
A patient refuses a recommended Cesarean section for fetal distress despite being informed of the risks. What is the nurse's primary documentation responsibility in this Informed Refusal scenario?
Show answer →The nurse must document that the Informed Refusal process occurred: 1. The provider explained the risks of refusal (e.g., fetal death, brain injury) and benefits of the procedure. 2. The patient demonstrated understanding of these risks. 3. The patient's capacity to make the decision (alert, oriented, not under duress). 4. Notification of the Chain of Command if the refusal creates an immediate threat to life. **Clinical Pearl:** Documentation of Patient refused is insufficient; it must reflect the *dialogue* and the patient's stated reasons/understanding.
A patient with BP 150/95 presents with epigastric pain and AST/ALT levels twice the upper limit of normal. What is the classification and the physiological cause of the pain?
Show answer →Classification: Preeclampsia with Severe Features. The epigastric or right upper quadrant pain is caused by hepatic swelling (edema) and stretching of Glisson’s capsule, often associated with subcapsular hematoma or hepatic ischemia. Exam Tip: Distinguish this from simple GERD; in the context of HTN, it is always a severe feature indicating hepatic involvement and potential for rupture.
17–20 correct
Strong. Move to the hardest material and timed drilling rather than re-reading topics you already know.
12–16 correct
A normal mid-prep score. Work the topics you missed one at a time — the topic pages below are built for exactly that.
Under 12 correct
Early days. Go topic by topic instead of taking more mixed tests: pick your weakest area below and drill it until the questions feel routine.
Pathology questions
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Management questions
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Assessment questions
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Pharmacology questions
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Physiology questions
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Try 30 free RNC-OB cards firstIt is 20 real question-and-answer cards from our 1050-card RNC-OB deck, mixed across topics so it feels like the breadth of the exam. It is not the official NCC exam and is not endorsed by NCC — for the official outline and any official practice material, go to NCC directly.
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