The failure rate of the Copper-T 380A (CuT 380A) IUD as measured by the Pearl Index under typical use is approximately:

• A 2–5 pregnancies per 100 woman-years
• B 5–8 pregnancies per 100 woman-years
• C 0.1–0.8 pregnancies per 100 woman-years ✓
• D 0.01 pregnancies per 100 woman-years (approaching sterilization rates)

Explanation

The CuT 380A is a highly effective long-acting reversible contraceptive (LARC). Its Pearl Index (failure rate) is 0.1–0.8 pregnancies per 100 woman-years under typical use (similar to perfect use since it does not depend on user behaviour). It is effective for up to 10–12 years. The high copper surface area (380 mm²) provides spermicidal effects via copper ions impairing sperm motility and acrosome reaction. A Pearl Index of 2–5 characterizes progestogen-only pills under typical use; 5–8 would be consistent with condoms or barrier methods.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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Written and medically reviewed by the StethoPrep medical team.