Which of the following are recognized advantages of using a hormonal Intrauterine Device (IUD) like Mirena? Select all that apply.

The symptothermal method is a fertility awareness-basedapproach that combines basal body temperature (BBT)tracking with cervical mucus observationand calendar calculations. Ovulationcauses a measurable rise in BBT due to progesteroneeffects on the hypothalamus. BBT typically increases by 0.3–0.6°C after ovulation and remains elevated until menstruation. Normal BBT ranges from 36.1°C to 36.4°C pre-ovulation and rises to 36.4°C to 37.0°C post-ovulation. Accurate daily temperature monitoring, taken at the same time each morning before activity, is essential for identifying the fertile window.

Rationale for correct answers

1.The symptothermal method requires daily BBT monitoring to detect the post-ovulatory temperature rise. This helps identify the fertile and infertile phases of the menstrual cycle. It is combined with cervical mucus tracking for improved accuracy.

Rationale for incorrect answers

2.The cervical cap is a barrier method that does not involve cycle tracking or temperature monitoring. It is inserted before intercourse and blocks sperm entry into the cervix.

3.Progestin-only pills require strict daily intake but do not involve temperature monitoring. Their efficacy depends on consistent timing, not physiological tracking.

4.The contraceptive patch delivers hormones transdermally and is replaced weekly. It does not require any temperature monitoring or cycle observation.

Take home points

• The symptothermal method uses BBT and cervical mucus to track fertility.
• BBT rises 0.3–0.6°C post-ovulation due to progesterone.
• Barrier and hormonal methods do not require temperature monitoring.
• Accurate daily measurement is essential for symptothermal effectiveness.

Long-acting reversible contraceptives (LARCs)include intrauterine devices (IUDs) and subdermal implants. They provide extended contraceptionwithout user action, lasting from 3 to 10 yearsdepending on type. They are highly effective, with failure rates <1%, and are reversibleupon removal, allowing rapid return to fertility. LARCs do not protect against STIs, and barrier methods are still required. They are suitable for adolescents, with no age restrictions. Normal menstrual cycle length is 21–35 days; LARCs may alter bleeding patterns but do not affect systemic hormone levels significantly.

Rationale for correct answers

1.LARCs have efficacy >99%, with failure rates <1% per year. This is due to minimal user dependency and continuous hormone or copper release. Their effectiveness surpasses that of pills, patches, or rings.

3.LARCs are reversible upon removal. Fertility typically returns within days to weeks. This reversibility distinguishes them from permanent methods like sterilization.

5.LARCs are suitable for adolescents. They are safe, effective, and recommended by major guidelines including ACOG and WHO. They reduce unintended pregnancy rates in this population.

Rationale for incorrect answers

2.LARCs do not require daily adherence. This is a major advantage over oral contraceptives, which have typical-use failure rates of 7% due to missed doses. LARCs eliminate user error.

4.LARCs do not protect against STIs. They prevent pregnancy but offer no barrier to pathogens. Condoms remain necessary for STI prevention, especially in high-risk populations.

Take home points

• LARCs are >99% effective and user-independent.
• They are reversible and fertility returns quickly after removal.
• Adolescents can safely use LARCs.
• LARCs do not protect against STIs; condoms are still needed.