Placenta previa occurs when the placenta partially or completely covers the cervical opening. It causes painless vaginal bleeding in the second and third trimester and requires caesarean delivery. At Mother Hospitals, Boduppal, we provide careful management including bed rest advice, bleeding surveillance, and planned caesarean section at the right gestational age. Call 97059 93366.
A low-lying placenta or placenta previa diagnosis on your scan can feel alarming. At Mother Hospitals, Boduppal, Dr. E. Prashanthi Reddy provides careful, evidence-based management — reassurance where appropriate, close surveillance throughout, and a clear delivery plan.
MBBS, DGO, PG Diploma in ART – Kiel University, Germany | 20+ Years Experience | TGMC Reg: 50624
The placenta is the organ that provides oxygen and nutrition to your baby throughout pregnancy. Normally, the placenta implants in the upper portion of the uterus. In placenta previa, the placenta implants low in the uterus — partially or completely covering the internal cervical os (the opening of the cervix). This creates the risk of serious bleeding during pregnancy and means vaginal delivery is not possible if the placenta still covers the os at term.
Modern classification uses a simple two-category system, though you may still encounter older four-grade terminology in some scan reports:
The scan report will usually state the distance from the placental edge to the internal os in millimetres — this is the key measurement.
These two terms are often used interchangeably by patients — but they have distinct meanings that affect management:
Placenta previa has a characteristic clinical presentation. Understanding the symptoms means you can act promptly if bleeding occurs — and know what distinguishes placenta previa bleeding from other causes.
The classic presentation of placenta previa is sudden, painless, bright red vaginal bleeding in the second or third trimester — typically after 20 weeks. Key features:
Any vaginal bleeding in pregnancy must be assessed the same day. Do not wait. Call 97059 93366.
Not all bleeding in pregnancy is due to placenta previa. Other causes include:
Diagnosis requires urgent ultrasound assessment — never assume the cause of bleeding without investigation.
Placenta previa occurs when the embryo implants in the lower uterine segment rather than the upper fundal region. Several factors increase this risk:
Prior caesarean section is the single most important risk factor — the scar tissue on the uterine wall attracts abnormal placental implantation. Each additional C-section doubles the risk again. Prior myomectomy, hysteroscopy with resection, and uterine curettage (D&C) also increase risk.
A previous pregnancy complicated by placenta previa increases the risk of recurrence in subsequent pregnancies by 4–8 times compared to the general population.
Twin or higher-order multiple pregnancies have a larger placenta that is more likely to extend into the lower uterine segment. The risk of placenta previa is approximately twice that of singleton pregnancies.
Women aged 35 and over have a higher risk of placenta previa, possibly related to changes in uterine vascularity and implantation patterns. The risk increases further after age 40.
IVF pregnancies have a modestly higher risk of placenta previa compared to spontaneously conceived pregnancies. This may relate to the embryo transfer technique placing the embryo lower in the uterine cavity, or to the underlying uterine environment in subfertile women. All IVF pregnancies at Mother Hospitals have detailed placental localisation on their anomaly scan.
Smoking in pregnancy is associated with abnormal placentation including previa. High parity (many previous pregnancies) — due to cumulative changes in the uterine lining from multiple pregnancies — also increases risk.
The vast majority of placenta previa cases are identified on the routine anomaly scan at 18–22 weeks of pregnancy — before any bleeding has occurred. This is one of the key benefits of structured antenatal care and routine ultrasound.
The 18–22 week anomaly scan includes placental localisation as a standard element. When a low-lying placenta is detected:
If a low-lying placenta is detected at the anomaly scan, a structured follow-up scanning programme is arranged:
⚠️ If you bleed at any gestation — even a small amount — do not wait for your next scheduled scan. Call 97059 93366 immediately.
The majority of women with placenta previa diagnosed on their anomaly scan have no symptoms. Management focuses on surveillance and education:
Even a small bleed requires immediate hospital assessment. Management on admission:
The timing and mode of delivery depend on the degree of placenta previa and whether bleeding has occurred:
Women with placenta previa — particularly those who have had a previous caesarean section — are at risk of the more serious condition of placenta accreta spectrum (PAS). This occurs when the placenta grows abnormally deeply into or through the uterine wall.
PAS carries a risk of catastrophic haemorrhage at delivery. The risk increases with the number of prior caesarean sections: 1 prior C-section + anterior previa = ~3% PAS risk; 3 or more prior C-sections + anterior previa = up to 40% PAS risk.
All women with placenta previa and a prior caesarean scar are assessed for PAS at Mother Hospitals:
Women who have conceived through IVF have a slightly higher rate of placenta previa than the general pregnant population. Understanding why helps us plan appropriate monitoring.
Several mechanisms may contribute to higher placenta previa rates in IVF pregnancies:
All IVF pregnancies at Mother Hospitals include placental localisation as a standard part of the anomaly scan. If a low-lying placenta is detected:
This is the question most women ask after receiving a low-lying placenta diagnosis at their anomaly scan. The reassuring answer is — most of the time, yes.
The placenta doesn't literally move — but as the lower uterine segment grows and elongates in the second and third trimester, the distance between the placental edge and the cervical os increases. This is why a low-lying placenta detected at 20 weeks often appears to have "migrated" upward on a later scan.
If your 20-week scan shows a low-lying placenta (edge within 20 mm but not covering the os), we will:
You do not need to be on strict bed rest or in hospital simply because of a low-lying placenta at 20 weeks — but you must attend for your follow-up scan and know what to do if bleeding occurs.
Dr. E. Prashanthi Reddy's training at Kiel University, Germany — a leading European obstetric centre — included high-risk obstetrics and antepartum haemorrhage management. Her evidence-based approach follows RCOG and ACOG guidelines on placenta previa management.
Accurate placental localisation by transvaginal ultrasound is available at Mother Hospitals. Follow-up scans, growth assessment, and Doppler are all performed on-site — no referral delays when your scan findings need to be reviewed quickly.
Women with confirmed placenta previa are delivered with full preparation — blood products available, IV access in place, experienced anaesthetist and surgical team briefed. We do not perform emergency caesarean sections in placenta previa without appropriate preparation.
Receiving a placenta previa diagnosis is frightening. We take time to explain exactly what has been found, what it means for your pregnancy, and what the plan is — at every appointment. You will not leave a consultation confused or without answers.
No two cases of placenta previa are identical. Your delivery plan takes into account the degree of previa, your prior uterine surgery history, the presence or absence of bleeding, gestational age, and fetal wellbeing. We do not apply a one-size-fits-all protocol.
Overseas Indian women who return to Hyderabad for delivery in the presence of a high-risk diagnosis including placenta previa are welcome at Mother Hospitals. We provide detailed handover letters and can coordinate with your international obstetric team for continuity of care.
If you have major placenta previa (the placenta overlies the cervical os at 32 weeks or later), vaginal delivery is not possible — a planned caesarean section is required. If you have a low-lying placenta with the placental edge more than 20 mm from the os at 36 weeks, vaginal delivery is generally possible, provided you deliver in a unit with immediate access to theatre. The decision is made based on your follow-up scan findings at 36 weeks. C-section at Mother Hospitals →
In most cases diagnosed at the 20-week anomaly scan, yes — 80–90% of low-lying placentas resolve by 32–36 weeks as the lower uterine segment grows. Major placenta previa (where the placenta completely covers the os) is less likely to resolve completely, though the degree of covering may reduce. A follow-up scan at 32 and 36 weeks provides the definitive picture. Your doctor will explain the outcome of your follow-up scan and adjust the delivery plan accordingly.
Bleeding in placenta previa occurs because the placenta is lying over the lower uterine segment, which stretches and thins in the third trimester. As the lower segment develops (especially after 28 weeks), the placenta cannot stretch with it — this causes separation of the placental edge from the uterine wall, resulting in bleeding. Triggers include sexual intercourse, internal examination, uterine contractions, or it may occur spontaneously at rest. The first (sentinel) bleed may be small, but subsequent episodes are often more severe — which is why any bleed requires immediate assessment.
Placenta previa itself does not directly harm the baby — the fetal blood supply is not disrupted unless there is massive haemorrhage causing maternal circulatory collapse. The main risks to the baby are: preterm delivery (if emergency caesarean is needed due to bleeding), fetal growth restriction (less common than with preeclampsia), and the risks associated with prematurity if delivered early. With planned delivery at 36–37 weeks, most babies do very well.
Activity restrictions depend on whether you have had any bleeding and the degree of previa. General advice for all women with confirmed placenta previa includes: avoiding sexual intercourse (penetrative sex and orgasm), avoiding strenuous exercise and heavy lifting, avoiding internal examinations (all examinations must be by ultrasound only), and knowing when to seek emergency care. Strict bed rest is not routinely required for asymptomatic placenta previa — it does not prevent bleeding and carries risks of blood clots. Your doctor will advise you individually based on your case.
For major placenta previa without prior bleeding: planned caesarean section at 36–37 weeks. Corticosteroids (betamethasone) for fetal lung maturity are given at 34–35 weeks in preparation. The caesarean is planned in daylight hours with a senior surgeon, anaesthetist, blood bank support, and a neonatal team on standby. For women who have had significant bleeding before 36 weeks: the timing of surgery is brought forward depending on the clinical situation. Emergency caesarean may be needed at any gestation if there is uncontrolled haemorrhage.
Travel needs to be discussed individually with your doctor. General guidance: if you have major placenta previa after 28 weeks, you should not travel long distances away from a hospital with obstetric and surgical facilities. Air travel beyond 28 weeks with major previa is generally not recommended by most obstetricians, as you need immediate access to emergency care if bleeding occurs. After any bleeding episode, travel should be avoided until you have been medically cleared. Short local journeys are usually acceptable. Always carry your scan reports and a letter from your doctor when travelling.
Placenta previa at term (major previa persisting to delivery) affects approximately 1 in 200 pregnancies (0.5%). However, a low-lying placenta at the 20-week anomaly scan is much more common — detected in up to 5% of all scans. The vast majority of these early findings resolve by 32–36 weeks as the lower uterine segment develops, meaning most women with a "low-lying placenta" at 20 weeks do not have placenta previa at term and can deliver vaginally.
Dr. E. Prashanthi Reddy · TGMC Reg: 50624