Critical first-trimester finding
Chorionicity (one placenta or two) determines pregnancy risk and surveillance protocol. Best determined at 11-13 weeks by ultrasound (T-sign vs lambda sign). Monochorionic pregnancies carry significantly higher risk than dichorionic.
TTTS, sIUGR, TAPS, TRAP
TTTS (twin-to-twin transfusion) affects 10-15 percent of monochorionic twins – unequal blood sharing requiring laser treatment.
sIUGR (selective intrauterine growth restriction) – unequal placental sharing.
TAPS (twin anaemia-polycythaemia sequence) – chronic small blood transfer.
TRAP (twin reversed arterial perfusion) – rare but specific to monochorionic twins.
How we monitor twins
Monochorionic twins: scan every 2 weeks from 16 weeks. Dichorionic twins: every 3-4 weeks from 20 weeks. Growth, Doppler, and amniotic fluid assessed at each scan.
Your fetal-medicine specialist
Your twin pregnancy is monitored by a clinician dedicated to fetal medicine, with a direct pathway to senior gynaecologist Dr. Priyadatt Patel for any pregnancy that needs obstetric care.
Dr. Mayank Chaudhary
An ISUOG-trained fetal-medicine consultant who monitors twin pregnancies with serial growth and Doppler surveillance, especially for monochorionic twins.
Standards & further reading. Our approach aligns with the ISUOG guidelines and the NHS pregnancy ultrasound guide.
Related fetal-medicine pages
NT ScanAnomaly Scan (TIFFA)Doppler ScanNIPTPrenatal GeneticsAmniocentesisCVSCVS vs AmniocentesisFetal MedicinePregnancy Care
Frequently asked
Why twin pregnancies need closer monitoring
A twin pregnancy is a higher-risk pregnancy, and the single most important question is the chorionicity — whether the twins share a placenta. This is established on an early scan and shapes the entire monitoring plan.
Shared-placenta (monochorionic) twins
Twins that share a placenta carry specific risks — most importantly twin-to-twin transfusion syndrome and selective growth restriction — and need more frequent, specialist ultrasound surveillance (typically fortnightly from the second trimester). Early detection is what allows timely intervention.
What we watch for across all twins
Growth discordance, pre-eclampsia, anaemia, preterm labour and complications of delivery are all more common with twins. A structured scan-and-review schedule, individualised to your chorionicity, lets us act early rather than react late.
Planning delivery
Timing and mode of delivery depend on chorionicity, growth, and your obstetric history; we plan this with you well in advance rather than leaving it to chance, and coordinate neonatal support for the birth.
Dr. Priyadatt Patel
Senior Gynecologist · Advanced Laparoscopic Surgeon · IVF and Endometriosis Programme Lead
MS OBGyn · Pregnancy Care · Advanced Gynaecological Ultrasound · Fertility Preservation
ESHRE / ESGE / AAGL / ASRM guideline-aligned practice. 3D Karl Storz precision technique. Fertility-preservation-first philosophy. Evidence-based decisions, honest counselling, long-term outcomes orientation.
Science City Road, Ahmedabad 380060
Mon–Sat 11:00–20:00 · +91 97234 31544
Naranpura, Ahmedabad
Mon–Sat 08:30–10:30 · +91 70460 02566
