OMSBPREP

OMSB Q&A Bank

OMSB nursing questions and answers, written the way the exam asks them

Single-best-answer stems with full rationales for every option. The bank is tagged by domain so you can drill exactly the OMSB topics your mock scores say are weak.

What the bank drills

Priority and 'first action' stemsDelegation and scope of practiceMedication safety and calculationsInfection control scenariosMaternal-newborn red flagsPaediatric assessment findings

Sample OMSB questions with rationales

Priority setting

A nurse receives handover for four patients. Who is seen first?

The patient with a respiratory rate of 8 after IV morphine.

Why: Airway and breathing outrank everything else. Opioid-induced respiratory depression is immediately reversible with naloxone, so this patient is assessed before pain, wound or discharge needs.

Electrolytes

Serum potassium is 6.8 mmol/L in a dialysis patient. What does the nurse check next?

A 12-lead ECG.

Why: Peaked T waves and widening QRS indicate cardiac instability, which determines whether emergency calcium gluconate is needed before any potassium-lowering therapy.

Obstetrics

Late decelerations appear on the CTG during an oxytocin infusion. First action?

Stop the oxytocin and reposition the mother to her left side.

Why: Late decelerations reflect uteroplacental insufficiency. Removing the stimulant and improving placental perfusion comes before oxygen, fluids or escalation.

Infection control

A patient with active pulmonary tuberculosis is admitted. Which room is correct?

A negative-pressure single room with N95 respirators for staff.

Why: TB spreads by droplet nuclei that stay airborne. Surgical masks and standard rooms do not interrupt airborne transmission.

How to answer a OMSB stem

  1. 1. Read the last line first — it tells you whether the question wants an assessment, an action or a teaching point.
  2. 2. Decide whether the patient is stable. Unstable means airway, breathing, circulation before anything else.
  3. 3. Eliminate any option that delegates, delays or documents when the patient needs the nurse now.
  4. 4. Between two clinically correct options, choose the one the nurse can do independently and immediately.
  5. 5. Never change an answer without a reason you can put into words.

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