Threatened Abortion
    clinical vaginal spottin/bleeding, uterine cramping
    wk 1-20 GA with cervical os closed
    occurs in 25% of clinically apparent gestations with 50% of these aborting
    progestinal drugs do not stop it, only delay it
    living embryo with CRL >5mm has a 90% chance of survival, <5mm has a 70%

Abnormal yolk sac (>6mm)
    thick wall, irregular wall, calcified
    80% abort with small sac.
    abnormal if no yolk sac seen with MDS > 20mm
   
Bradycardia 5-8wks < 85bpm (reassess in 4d)
    associated with 99% loss

Abnormal decidual reaction
    thin < 2mm
    low echogenicity

Abnormal gestational sac
    irregular margin
    flattened
    if amnion seen without embryo then it is called blighted

Location
    low near cervix

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