AG2P1 to female has a history of previous preterm birth at 32 weeks. The percentage chances of preterm birth in this pregnancy are:
**Core Concept**
The question is testing the understanding of the concept of recurrent preterm labor, specifically the increased risk of preterm birth in a subsequent pregnancy after a previous preterm birth. This is a key factor in identifying high-risk pregnancies and implementing preventive measures.
**Why the Correct Answer is Right**
The risk of preterm birth is significantly increased in women with a history of previous preterm birth. Studies have shown that the risk of preterm birth in a subsequent pregnancy is around 15-20% if the previous preterm birth occurred before 32 weeks of gestation. This is because the underlying causes of preterm birth, such as cervical insufficiency or uterine anomalies, may persist in the subsequent pregnancy. In this case, the patient's history of previous preterm birth at 32 weeks increases her risk of preterm birth in the current pregnancy.
**Why Each Wrong Option is Incorrect**
* **Option A:** The risk of preterm birth is not significantly increased in women with a history of previous term birth. This option is incorrect because previous term births do not carry the same risk of preterm birth as previous preterm births.
* **Option B:** The risk of preterm birth is not related to the gestational age of the previous preterm birth. This option is incorrect because the risk of preterm birth is indeed related to the gestational age of the previous preterm birth, with earlier preterm births carrying a higher risk.
* **Option C:** The risk of preterm birth is not increased in women with a history of previous preterm birth due to other factors. This option is incorrect because the underlying causes of preterm birth, such as cervical insufficiency or uterine anomalies, may indeed persist in the subsequent pregnancy, increasing the risk of preterm birth.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the risk of preterm birth is cumulative, meaning that women with a history of multiple previous preterm births are at even higher risk in subsequent pregnancies. This highlights the importance of identifying and managing risk factors for preterm birth in high-risk populations.
**Correct Answer: D. 15-20%**