Multiple Pregnancy / Twin Pregnancy – Investigations

Multiple Pregnancy / Twin Pregnancy – Investigations:


  • two gestational sacs can be detected as early as 10th week of pregnancy
  • Detection of two fetal heads and their accurate measurement of biparietal diameters can be made by the 14th week
  • For assessment of placenta ion, sonar is done between 16-24 weeks.


  • Is done less often these days. Two fetal heads and spines could be seen.

Biochemical tests:

  • Maternal serum chronic gonadotrophin, α fetoprotein and unconjugated oestriol are approximately double than those of singleton pregnancies. But their values cannot diagnose clearly a twin from a single fetus.

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