KPSC Staff Nurse - 2021
Obstetrics & Gynaecology
Easy
Which is not a barrier method of contraception?
Appeared in: KPSC Staff Nurse - 2021
Explanation
- Copper T is correctly identified as not being a barrier method; it is an Intrauterine Device (IUD).
- Its primary mechanism is not to create a physical barrier at the cervix, but to release copper ions into the uterus.
- These copper ions are toxic to sperm (spermicidal) and create a local inflammatory reaction that prevents both fertilization and implantation.
- Unlike barrier methods, which are typically used only during intercourse, an IUD provides continuous, long-term contraception.
Why Other Options Were Wrong
- Option A: A condom is a classic example of a physical barrier method. It is a sheath that covers the penis to collect semen, physically preventing sperm from entering the vagina.
- Option B: A cervical cap is a barrier method. It is a thimble-shaped silicone cup that fits snugly over the cervix, blocking sperm from entering the uterus.
- Option D: A diaphragm is a barrier method. It is a dome-shaped device that is placed in the vagina to cover the cervix, acting as a physical block to sperm.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of contraceptive methods (Barrier vs. Intrauterine Devices) as background academic context rather than a clinical decision trigger.
- Nurses play a crucial role in counseling patients on contraceptive options, ensuring they understand the differences in mechanism, effectiveness, typical use vs. perfect use, and protection against STIs.
- A key counseling point is that while IUDs like Copper T are highly effective for long-term pregnancy prevention, they offer no protection against STIs. Barrier methods like condoms are essential for STI prevention.
- Patient education must include how to use the chosen method correctly, potential side effects, and when to seek medical advice. For IUDs, this includes teaching the patient how to check for the strings.
How to Approach the Question
- First, identify the negative keyword 'not' in the question. This signals that you are looking for the option that is an exception or does not fit the category.
- Next, define the key concept: 'barrier method of contraception'. A barrier method works by physically or chemically blocking sperm from reaching the egg.
- Systematically evaluate each option against this definition.
- Option A, Condom: Physically blocks sperm. It is a barrier method.
- Option B, Cervical cap: Physically blocks the cervix. It is a barrier method.
- Option D, Diaphragm: Physically blocks the cervix. It is a barrier method.
Concept Tested & Keywords
- Concept Tested: Classification of contraceptive methods (Barrier vs. Intrauterine Devices)
- Stem keywords: contraception, barrier method
- Lead-in keywords: not
- Negative lead-in flag: Question asks for the option that does not belong to the specified category (barrier methods).
Question ID
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Reference Book
E6 Nursing Fundamentals Taylor p. 1009-1011
E6 Physiology Essentials Sembulingam 10e Part 2 p. 153-155
E6 Nursing Fundamentals Potter Perry 12e Part 4 p. 2
Practise the full KPSC Staff Nurse - 2021
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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