I'm currently 22+5 with monochorionic twins after 3 miscarriages. I am being scanned every 3 weeks to monitor for TTTS and so far the fluid levels in each twin have appeared normal. I have been reading that perhaps 3 weeks is too long to go between scans since TTTS could come on suddenly. I was wondering if I should be asking to increase the frequency of scans? Also, should I be asking for a doppler ulrasound to look at cord blood flow?

Monochorionic twins are identical twins that share a placenta, and are at approximately 10% risk of twin-twin transfusion syndrome (TTTS). This can be a serious condition, but is amenable to treatment and/or early delivery, hence the reason why you are having regular scans. The frequency of follow up scans depend on your hospitalís policies; many units scan every 2 weeks or so-and more frequently if there are any concerns, so it may be sensible to discuss the frequency of scans with your obstetrician. Doppler ultrasound of the umbilical arteries would normally be done if there is any concern about TTTS from the scan, but not always done automatically if everything looks OK.
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