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Part A of 3 The 20 Skills Stations Chapter 2 of 35

Intramuscular Injection: OSCE Station Checklist

The NMC OSCE IM injection station: site selection, Z-track technique, needle angle, vaccine rules, and 5 practice questions with answers.

Start reading ← Course contents ~5 min read
JobLabs Editorial
By JobLabs Editorial · UK healthcare reference editorial team
· · 2 min read

The IM station is the SC station’s bigger sibling: same wrap-around marks, one extra clinical decision. That decision, which muscle, is where this station is really marked.

The site logic:

  • Deltoid: small volumes, up to about 1 to 2 mL. The adult vaccine site.
  • Vastus lateralis (outer thigh): larger volumes, good access, the paediatric default.
  • Ventrogluteal: larger volumes in adults, increasingly the UK-preferred gluteal site.
  • Dorsogluteal: out of favour in the UK because of sciatic nerve and vessel proximity; if you name it as your choice, expect follow-up.

Volume drives the choice, and the examiner wants to hear the logic: “three millilitres, so I’m using the ventrogluteal site rather than the deltoid.” One sentence, one mark.

The sequence is otherwise familiar from the SC station: prescription and allergy check, hand hygiene, identity and consent, prepare with clean technique, position and expose with dignity. Then the IM specifics:

  1. Locate the site using landmarks, not guesswork.
  2. Z-track: pull the skin laterally and hold.
  3. Insert at 90 degrees, needle long enough to reach muscle (25 mm is typical).
  4. Inject slowly, around 1 mL per 10 seconds.
  5. Withdraw, release the skin, no massage.
  6. Sharp in the bin at point of use, hand hygiene, document.

The aspiration question

Internationally trained candidates often learned to aspirate on every IM injection. UK vaccine guidance (the Green Book) dropped aspiration at recommended sites; there are no large vessels there, and slow steady injection is the standard. For other IM drugs, practice varies by trust, and the station’s own paperwork wins. The safe exam behaviour: know the vaccine rule, and follow whatever local policy the station hands you. If you do aspirate and see blood, withdraw, discard, and start fresh; that contingency is worth saying aloud even when it doesn’t happen.

Details that quietly carry marks

Documentation on this station has extra lines: site given (so the next dose rotates), and for vaccines the batch number and expiry from the vial. The paperwork in front of you includes them because the checklist wants them copied across. And the pain-behaviour marks are real: warn before the needle goes in, watch the patient’s face during, ask how they are after. The actor has been briefed to notice being treated as furniture.

Five questions below, then the station most paired with injections: inhaled medication.

Sources & further reading

  1. 1NMC — Test of competencenmc.org.uk
  2. 2UKHSA — Immunisation Green Bookgov.uk
  3. 3RCN — Clinical skills resourcesrcn.org.uk
Key takeaway from Intramuscular Injection: OSCE Station Checklist

Frequently asked questions

Do I aspirate before an IM injection?
Not for vaccines: UK immunisation guidance (the Green Book) says aspiration isn't needed at recommended sites. For other IM drugs, follow the local policy the station gives you; if the examiner's paperwork says aspirate, aspirate.
What is the Z-track technique?
Pulling the skin sideways before inserting the needle, then releasing after withdrawal so the tissue layers slide back and seal the track. It reduces leak-back into subcutaneous tissue and staining, and it's expected on OSCE IM stations.
What angle and needle for IM?
90 degrees to the skin with a needle long enough to reach muscle, typically 25 mm (longer for larger patients). A too-short needle deposits the drug subcutaneously, which changes absorption.

Check your understanding

Quick quiz: Intramuscular Injection: OSCE Station Checklist

5questions. Click an answer to see the explanation. Your score is saved on this device only.

  1. 1

    A 1 mL vaccine is prescribed IM for an adult. Which site is standard?

  2. 2

    Why do you pull the skin laterally before inserting the needle?

  3. 3

    At what angle does an IM needle enter the skin?

  4. 4

    You're asked to give a 3 mL IM antibiotic. Which site do you choose, and why?

  5. 5

    Immediately after withdrawing the needle, the correct actions are:

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