Identifying Non-Risk Factors for Placenta Previa

The question asks to identify the factor that does NOT contribute to the risk of developing placenta previa. Placenta previa is a condition where the placenta partially or completely covers the cervix.

Established Risk Factors for Placenta Previa

Several factors are known to increase the likelihood of developing placenta previa:

• Advanced Maternal Age: Women over 35 years old have a higher risk.
• Previous Uterine Surgeries: Procedures like previous caesarean sections (C-sections), uterine myomectomy, or dilation and curettage (D&C) can increase risk due to scarring.
• History of Placenta Previa: Women who have had placenta previa before are at higher risk in subsequent pregnancies.
• Smoking: Maternal smoking is a significant risk factor.
• Multiparity: Having had multiple previous pregnancies.
• Multiple Gestation: Carrying twins or more.
• In Vitro Fertilization (IVF): Conception via IVF is associated with a slightly increased risk.

Analysis of Provided Options

Let's evaluate the given options in the context of known risk factors:

• Maternal Age: Advanced maternal age (over 35) is a well-established risk factor.
• Smoking: Smoking during pregnancy is a confirmed risk factor for placenta previa.
• Previous Caesarean Section: Scarring and changes in the uterine lining from a previous C-section significantly increase the risk.
• Maternal Anaemia: While anaemia can be a complication during pregnancy and may affect pregnancy outcomes, it is not considered a direct or primary risk factor for the *development* of placenta previa itself. Current medical literature does not strongly associate maternal anaemia with an increased incidence of this condition.

Therefore, maternal anaemia is the factor among the choices that is NOT a risk factor for developing placenta previa.