100+ Free C-OBE Practice Questions

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Which finding represents an EARLY sign of maternal decompensation that may precede frank shock?

Cold mottled extremities with capillary refill >5 seconds

New-onset confusion or anxiety with narrowing pulse pressure

Coma with absent peripheral pulses

Cardiac arrest

to track

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2026 Statistics

Key Facts: C-OBE Exam

125

Total Questions

100 scored + 25 pretest

2 hrs

Time Limit

NCC

75%

Largest Domain Weight

Identification/Management/Treatment

Multi

Eligibility

MD/DO, RN, APRN, midwife, PA, paramedic

$210

Exam Fee

NCC

≤5 min

Perimortem Cesarean

From maternal arrest

The C-OBE (Obstetric Emergencies) exam is administered by NCC and is open to a multidisciplinary group including physicians, RNs, APRNs, certified midwives, PAs, and paramedics. The exam consists of 125 multiple-choice questions (100 scored, 25 pretest) with a 2-hour time limit. Identification, Management and Treatment of Emergencies dominates at 75% of the exam — covering hemorrhage, hypertensive crisis, AFE, maternal arrest, shoulder dystocia, and sepsis. Test-center only.

Sample C-OBE Practice Questions

Try these sample questions to test your C-OBE exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A laboring patient at 38 weeks has a history of class III obesity, chronic hypertension, and pregestational diabetes. Which finding from her medical history is MOST important for stratifying her risk of an obstetric emergency on admission?

A.Combined cardiometabolic risk factors that compound risk for preeclampsia, hemorrhage, and shoulder dystocia

B.Maternal blood type O positive without antibodies

C.Use of prenatal vitamins throughout pregnancy

D.History of two prior uncomplicated vaginal deliveries

Explanation: The AIM Maternal Early Warning bundle and ACOG emphasize that compounding cardiometabolic comorbidities (obesity + chronic HTN + diabetes) dramatically raise risk for superimposed preeclampsia, postpartum hemorrhage from atony, and shoulder dystocia from fetal macrosomia. Layered risk factors, not single conditions, drive the highest morbidity and require enhanced surveillance and a documented response plan.

2Which set of vital sign trends in a postpartum patient should trigger activation of a Maternal Early Warning System (MEWS)?

A.Sustained HR >110, systolic BP <90, RR >24, oxygen saturation <93%

B.Heart rate 88, systolic BP 118, respiratory rate 18, SpO2 99%

C.Temperature 37.0 C with normal lochia

D.Pain rated 3/10 controlled with scheduled acetaminophen

Explanation: AIM and the National Partnership for Maternal Safety MEWS criteria flag any of: systolic BP <90 or >160, diastolic >100, HR <50 or >120, RR <10 or >30, SpO2 <95% on room air, or oliguria. Sustained tachycardia, hypotension, tachypnea, and hypoxia together are red flags for sepsis, hemorrhage, AFE, or pulmonary embolism and require immediate bedside evaluation.

3Which physiologic change of pregnancy MOST commonly masks early hemorrhagic shock until 1500-2000 mL of blood loss has occurred?

A.30-50% increase in plasma volume and compensatory tachycardia

B.Decreased gastric motility

C.Increased tidal volume

D.Decreased serum albumin

Explanation: Pregnancy expands plasma volume by 30-50% and increases cardiac output by 30-50%, allowing the parturient to compensate hemodynamically until significant blood loss occurs. This is why pulse and blood pressure can appear normal until hemorrhage is advanced, making quantitative blood loss measurement and trend monitoring essential.

4A pregnant patient at 28 weeks reports daily methamphetamine use. What is the MOST important immediate clinical concern?

A.Risk of hypertensive crisis, placental abruption, and intrauterine growth restriction

B.Increased risk of gestational diabetes

C.Anemia from iron deficiency

D.Vitamin D insufficiency

Explanation: Methamphetamine use causes sympathomimetic surges leading to severe hypertension, vasoconstriction, placental abruption, IUGR, and preterm labor. Trauma-informed assessment, addiction medicine consult, and continuous fetal/maternal monitoring are essential along with non-judgmental care to maintain therapeutic alliance.

5A patient with sickle cell disease is admitted in labor. Which proactive plan BEST reduces risk of an obstetric emergency?

A.Maintain hydration, oxygenation, normothermia, and aggressive pain control with patient-controlled analgesia

B.Restrict IV fluids to prevent volume overload

C.Withhold opioids to prevent respiratory depression

D.Encourage ambulation only with cool compresses

Explanation: Sickle cell crisis in pregnancy is precipitated by hypoxia, dehydration, acidosis, cold, and stress. Per ACOG and Pacheco, intrapartum care emphasizes IV hydration, supplemental oxygen, warmth, and aggressive multimodal pain control (including opioids) to prevent vaso-occlusive crisis, acute chest syndrome, and stroke.

6What is the earliest objective sign of maternal decompensation in obstetric sepsis that may precede hypotension?

A.Persistent tachycardia and tachypnea with subtle mental status change

B.Frank hypotension with mottled extremities

C.Anuria for 6 hours

D.Serum lactate of 1.0 mmol/L

Explanation: Pregnant patients compensate well, so early sepsis manifests as persistent tachycardia, tachypnea, and altered mental status before hypotension. AWHONN and SMFM emphasize trending these subtle changes (qSOFA-OB, omSOFA) for earlier recognition because the obstetric population is younger and reserves are higher.

7A patient with a previous classical cesarean section presents in labor at 39 weeks. What is the MOST appropriate plan to prevent uterine rupture?

A.Scheduled repeat cesarean delivery; trial of labor is contraindicated

B.Trial of labor with continuous fetal monitoring

C.Induction with low-dose oxytocin

D.Augmentation with prostaglandin gel

Explanation: ACOG considers prior classical (vertical) uterine incision an absolute contraindication to trial of labor due to a 4-9% rupture risk. Scheduled cesarean before labor onset (typically 36-37 weeks) is the standard. TOLAC is reserved for low-transverse incisions in carefully selected candidates.

8Which patient is at HIGHEST risk for placenta accreta spectrum?

A.Patient with placenta previa and three prior cesarean deliveries

B.Primigravida with anterior placenta

C.Patient with twin gestation and posterior placenta

D.Patient with one prior vaginal delivery and posterior placenta

Explanation: Placenta previa overlying a prior cesarean scar is the dominant risk factor for placenta accreta spectrum. Risk rises with the number of prior cesareans: ~3% with one, ~11% with two, ~40% with three, and >60% with four or more. Antenatal ultrasound and MRI screening enable a planned delivery at an experienced center.

9Per the AIM Severe Hypertension in Pregnancy bundle, which screening practice should occur on every obstetric admission?

A.Standardized review of risk factors for preeclampsia and severe hypertension with documented plan

B.Routine 24-hour urine collection for proteinuria

C.Daily echocardiogram

D.Universal head CT scan

Explanation: The AIM bundle requires a unit-wide standardized risk assessment for severe hypertension/preeclampsia at admission, with documented escalation plans and ready access to first-line antihypertensives. Routine echo, CT, and 24-hour collections are not part of universal admission screening.

10Which laboratory finding is MOST suggestive of HELLP syndrome rather than uncomplicated severe preeclampsia?

A.Platelets <100,000, AST >70, LDH >600, hemolysis on smear

B.Proteinuria of 300 mg/24 hours

C.Hematocrit of 38% with normal platelets

D.Serum creatinine of 0.7 mg/dL

Explanation: HELLP (Hemolysis, Elevated Liver enzymes, Low Platelets) requires the classic triad: schistocytes/elevated bilirubin or LDH >600, AST/ALT typically >2x upper limit of normal, and platelets <100,000. ACOG/Tennessee classification helps standardize severity. HELLP can occur without severe HTN or proteinuria.

About the C-OBE Exam

Multidisciplinary subspecialty certification for clinicians who identify, manage, and treat obstetric emergencies. The C-OBE validates expertise in maternal early warning recognition, AIM safety bundles, postpartum hemorrhage, severe hypertensive disorders (preeclampsia, eclampsia, HELLP), maternal resuscitation (AFE, perimortem cesarean), shoulder dystocia, cord prolapse, maternal sepsis, and team communication during obstetric crises.

Questions

125 scored questions

Time Limit

2 hours

Passing Score

Pass/Fail (scaled)

Exam Fee

$210 (NCC)

C-OBE Exam Content Outline

20%

Assessment and Prevention

Risk stratification, MEWS, physical exam, AIM safety bundles, health disparities

75%

Identification, Management and Treatment of Emergencies

Hemorrhage, hypertensive emergencies, maternal resuscitation, intrapartum/postpartum, infection/sepsis, medical emergencies

Professional Practice

Closed-loop communication, SBAR, debriefing, implicit bias, family communication

How to Pass the C-OBE Exam

What You Need to Know

Passing score: Pass/Fail (scaled)
Exam length: 125 questions
Time limit: 2 hours
Exam fee: $210

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

C-OBE Study Tips from Top Performers

1Spend the bulk of your time on Identification/Management/Treatment (75%) — hemorrhage, severe HTN, AFE, maternal arrest, shoulder dystocia, sepsis

2Memorize magnesium sulfate dosing (4-6g IV load, 1-2g/h maintenance), therapeutic range (4-7 mEq/L), toxicity signs, and calcium gluconate antidote

3Know perimortem cesarean delivery (PMCD) timing — initiate within 4 minutes of maternal arrest, deliver by 5 minutes

4Master AIM Patient Safety Bundles: Severe Hypertension, Obstetric Hemorrhage, Sepsis, and Reduction of Peripartum Disparities

5Complete at least 100 practice questions before scheduling your exam

Frequently Asked Questions

Who can sit for the C-OBE exam?

C-OBE is a multidisciplinary credential open to physicians (MD/DO), registered nurses, advanced practice registered nurses, certified midwives, physician assistants, and paramedics involved in obstetric emergency response. The exam supports team-based credentialing for L&D units, MFM services, and EMS systems that respond to OB emergencies.

What dominates the C-OBE exam content?

Identification, Management and Treatment of Emergencies is by far the largest domain at 75% of the exam. This includes obstetric hemorrhage (4 T's, uterotonics, TXA, mass transfusion, B-Lynch, Bakri/JADA), severe hypertensive emergencies (magnesium load 4-6g + 1-2g/h, antihypertensives, HELLP, eclampsia), maternal resuscitation (AFE, perimortem cesarean within 5 minutes of arrest), shoulder dystocia (HELPERR), cord prolapse, and maternal sepsis (Hour-1 bundle).

What AIM safety bundles are tested on C-OBE?

The C-OBE exam draws heavily on the Alliance for Innovation on Maternal Health (AIM) Patient Safety Bundles, particularly Severe Hypertension in Pregnancy, Obstetric Hemorrhage, Maternal Sepsis, and the Reduction of Peripartum Racial/Ethnic Disparities bundle. Knowing the bundle elements (Readiness, Recognition, Response, Reporting/Systems Learning) and time-critical thresholds is high-yield for the Assessment and Prevention domain.

Is the C-OBE exam offered remotely?

No. C-OBE is currently test-center only — there is no remote proctoring option. Candidates schedule their exam at a PSI test center through the link on the NCC credential page. Plan ahead since test-center availability varies by region.

How should I study for the C-OBE exam?

Plan for 40-60 hours of study over 6-10 weeks. Focus the bulk of your time on Identification/Management/Treatment (75% of exam) — master hemorrhage management, magnesium sulfate dosing and toxicity, perimortem cesarean timing, shoulder dystocia maneuvers, and maternal sepsis Hour-1 bundle. Use the NCC C-OBE candidate guide as your blueprint.