What defines a nullipara?

A nullipara is specifically defined as a woman who has never given birth to a fetus that reaches the age of viability, which is typically considered to be around 20 weeks of gestation or a weight of 500 grams. This definition is essential for understanding obstetric history and future pregnancy management. The term highlights the woman's experience regarding childbirth, with 'nulli-' indicating 'none', thus signifying that she has not yet experienced the completion of pregnancy that results in a live birth or a stillbirth beyond the specified gestational age.

In contrast, the other options describe different aspects of pregnancy history. A woman who has had one miscarriage before 20 weeks would not be classified as a nullipara because she technically had a pregnancy that ended prior to viability. One who has given birth to a live child is considered a multipara, which directly opposes the definition of nullipara. Lastly, a woman who has had multiple pregnancies would also not fit the definition of nullipara, as the term implies no completed pregnancies that reached the threshold of viability. Therefore, the correct definition of nullipara is indeed that which refers to a woman who has not carried a baby to 500 grams or 20 weeks.