Educational exam prep, not medical advice. This page teaches what certification exams test. Follow your facility’s policies, your supervising clinician and the manufacturer’s instructions in practice. If you are a patient with a health question, talk to your clinician or see MedlinePlus.
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Injection routes at a glance
| Route | Angle | Typical needle | Common sites |
|---|---|---|---|
| Intramuscular (IM) | 90 degrees | 22-25 gauge; 1-1.5 inch for most adults in the deltoid (by weight) | Deltoid, vastus lateralis (infants), ventrogluteal |
| Subcutaneous (SubQ) | 45 degrees | 23-25 gauge, 5/8 inch | Fatty tissue over the triceps, anterolateral thigh, abdomen |
| Intradermal (ID) | 10-15 degrees | 26-27 gauge, short needle | Inner forearm (e.g., TB skin test) |
Details the exam likes
- Z-track IM technique pulls the skin laterally before injecting to seal medication in the muscle - used for irritating drugs.
- For infants, the vastus lateralis (anterolateral thigh) is the preferred IM site.
- Activate the safety device and dispose of the needle in a sharps container immediately - never recap by hand.
- The “rights” of medication administration (patient, drug, dose, route, time, documentation) are checked before every injection.
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Frequently asked questions
What angle is a subcutaneous injection?
45 degrees (CDC vaccine guidance).
What angle is an intramuscular injection?
90 degrees.
What is the preferred IM site for infants?
The vastus lateralis muscle of the anterolateral thigh.
What is the Z-track method?
An IM technique that displaces the skin before injection to keep medication in the muscle.
Sources
- CDC - Vaccine Administration: Needle Gauge and Length (accessed 2026-09-23)
- NHA - CCMA Test Plan (2022 job analysis) (accessed 2026-09-23)