OSCE Clinical Procedures and Protocols 2 — Questions and Answers
Question 1: When performing a venipuncture, which vein is the FIRST choice for routine blood collection in adults?
- Cephalic vein
- Median cubital vein (Correct answer)
- Basilic vein
- Dorsal hand vein
Correct answer: Median cubital vein
The median cubital vein is preferred because it is large, well-anchored, and poses less risk of arterial puncture or nerve injury.
Question 2: A patient requires a nasogastric (NG) tube insertion. After placement, which is the MOST reliable bedside method to confirm correct gastric positioning?
- Auscultation of air insufflation over the epigastrium
- Checking pH of aspirate (pH ≤ 5.5) (Correct answer)
- Observing for absence of respiratory distress
- Measuring the external tube length
Correct answer: Checking pH of aspirate (pH ≤ 5.5)
Aspirate pH ≤ 5.5 is the most reliable bedside confirmation; auscultation alone is unreliable and can miss bronchial placement.
Question 3: During urinary catheterization of a male patient, resistance is encountered at the external sphincter. What is the correct next step?
- Apply firm, continuous pressure to force the catheter through
- Ask the patient to bear down as if defecating
- Ask the patient to take slow deep breaths and gently advance during relaxation (Correct answer)
- Withdraw the catheter and attempt a larger size
Correct answer: Ask the patient to take slow deep breaths and gently advance during relaxation
Having the patient breathe deeply relaxes the external urethral sphincter, allowing gentle advancement of the catheter without trauma.
Question 4: Which landmark is used for a standard lumbar puncture (LP) in adults?
- L1–L2 interspace
- L3–L4 interspace (Correct answer)
- T12–L1 interspace
- L5–S1 interspace
Correct answer: L3–L4 interspace
The L3–L4 interspace (or L4–L5) is used because the spinal cord ends at L1–L2, minimizing risk of cord injury.
Question 5: When performing a wound closure with interrupted sutures, how far from the wound edge should the needle typically enter the skin?
- 1–2 mm
- 3–4 mm
- 5–10 mm (Correct answer)
- 12–15 mm
Correct answer: 5–10 mm
Entering 5–10 mm from the wound edge ensures adequate tissue bite for secure closure without causing ischemia from excessive tension.
Question 6: A patient develops a tension pneumothorax. After needle thoracocentesis, where is a chest drain (intercostal tube) most safely inserted?
- 2nd intercostal space, midclavicular line
- 4th–5th intercostal space, anterior axillary line (safe triangle) (Correct answer)
- 7th intercostal space, posterior axillary line
- 3rd intercostal space, midaxillary line
Correct answer: 4th–5th intercostal space, anterior axillary line (safe triangle)
The safe triangle (bordered by pectoralis major, latissimus dorsi, and the 5th rib) minimizes risk of injury to vessels, nerves, and solid organs.
Question 7: Which of the following steps is ESSENTIAL immediately before performing a joint aspiration (arthrocentesis)?
- Administer prophylactic antibiotics
- Apply a tourniquet proximal to the joint
- Use strict aseptic technique and skin antisepsis (Correct answer)
- Order pre-procedure coagulation studies for all patients
Correct answer: Use strict aseptic technique and skin antisepsis
Strict aseptic technique is mandatory to prevent introducing infection into the joint space during arthrocentesis.
OSCE Clinical Procedures and Protocols 2
When performing a venipuncture, which vein is the FIRST choice for routine blood collection in adults?