What is a dating and viability ultrasound


This idea stems from the use of a blood patch for treatment of spinal headache [].

An aggressive interventional protocol for early mid-trimester PROM using a gelatin sponge for cervical plugging in patients with spontaneous or iatrogenic preterm PROM at less than 22 weeks with significant oligohydramnios (maximum vertical pocket ] introduced an “amniopatch” consisting of autologous or heterologous platelets and cryoprecipitate through a 22-gauge needle intra-amniotically into seven patients with preterm PROM 16 to 24 weeks after fetoscopy or genetic amniocentesis and reported a fetal survival rate of 42.8% (three of seven).

When the fetal pole grows to more than 4mm the baby’s heart beat can be picked up on the ultrasound and these things normally occur 4 ½ weeks after conception (about 6 ½ weeks from the last menstrual period).

Because the time of conception is often uncertain, a dating scan may not show as advanced a pregnancy as expected based on the period dates.

For most mums-to-be you will be required to go to your doctor to confirm your pregnancy and they will give you referrals to have a dating scan and blood tests.


The first part of a pregnancy to be visible on ultrasound is the “gestational sac” which can be seen with a transvaginal scan approximately 3 weeks after a baby is conceived. During the next 2 weeks first a “yolk sac” and then a small “fetal pole” become visible.In this case a follow up scan after an interval when normal growth can be expected to now show these things will be recommended.



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