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LNG-IUD start timing — DFSRH MCQ

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ModerateIntrauterine methodsLNG-IUD start timingDFSRH

A 34-year-old has a 52 mg LNG-IUD inserted on day 11 of a regular 28-day cycle. She has had no sex since her last period and pregnancy is reasonably excluded. What would you advise this patient?

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Correct answer: B — Use condoms or abstain for 7 days

An LNG-IUD inserted after day 7 of the cycle requires 7 days for contraceptive efficacy, assuming pregnancy can be reasonably excluded. A copper IUD would be effective immediately, but this is not true of LNG-IUD insertion outside the early-cycle window. Emergency contraception is unnecessary if there has been no intercourse since the last period.

Reference: FSRH Guideline Intrauterine Contraception