NHA Certified Clinical Medical Assistant (CCMA)Clinical Patient CareHard
A medical assistant is preparing to administer a purified protein derivative (PPD) test. Which of the following sites is the most appropriate for this injection?
- ADeltoid muscle of the upper arm.
- BVastus lateralis muscle of the thigh.
- CButtocks, upper outer quadrant.
- DForearm, inner aspect.
Show answer & explanationAnswer & explanation
Correct answer: D. Forearm, inner aspect.
The PPD test (Mantoux test) is an intradermal injection, meaning the medication is deposited into the dermis. The inner aspect of the forearm is the preferred site due to its thin, hairless skin, which allows for easy visualization of the injection site and subsequent reaction (wheal formation).
Why the other options are wrong
- A. The deltoid is an intramuscular (IM) injection site, used for vaccines, not intradermal tests.
- B. The vastus lateralis is an intramuscular (IM) injection site, often used for infants and children, not intradermal tests.
- C. The buttocks (dorsogluteal or ventrogluteal) are intramuscular (IM) injection sites, typically used for larger volumes of medication, not intradermal tests.
PPD Injection Site
The specific anatomical location on the body used for administering a Purified Protein Derivative (PPD) test, which is an intradermal injection.
- Site: Inner aspect of the forearm.
- Injection type: Intradermal.
- Rationale: Thin skin, easy visibility of reaction.
Memory trick: For 'PPD's tiny test', the 'forearm's inner rest' is truly the 'best'.