Placenta previa is a condition in pregnancy where the placenta partially or completely covers the cervix, the opening to the uterus. This can lead to painless vaginal bleeding, especially in the second or third trimester. Here's a breakdown of what you should know:
Definition : The placenta implants low in the uterus and may cover the cervix.
Types:
Complete previa: Cervix is completely covered.
Partial previa: Partially covers the cervix.
Marginal previa: Placenta is near the cervix but not covering it.
Low-lying placenta: Close to the cervix but not touching it.
Common Symptom : Painless, bright red vaginal bleeding.
Timing : Often occurs in the second half of pregnancy (after 20 weeks).
Trigger : May be spontaneous or after intercourse or a vaginal exam.
Maternal : Severe blood loss, shock, need for blood transfusion.
Fetal : Preterm birth, growth restriction, distress due to reduced oxygen/nutrient flow.
Usually identified during a routine ultrasound (anatomy scan around 18–20 weeks).
If bleeding occurs, a transvaginal ultrasound is used to confirm location.
Depends on:
Gestational age
Severity of bleeding
Type of previa