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.
Frequently asked
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