Which statement about obstetric dating and assessment is correct

Hyperemesis gravidarum is a severe form of morning sickness in which women suffer with excessive nausea and vomiting which prevents them taking in adequate amounts of food and water.

It is thought to be caused by high levels of circulating HCG.

There is no difference, however, in perinatal death or poor outcomes for babies.

In normal state, each body tissue type, such as liver, spleen or kidney, has a unique echogenicity.

One variant, a transvaginal sonography, is done with a probe placed in the woman's vagina.

Traditional obstetric sonograms are done by placing a transducer on the abdomen of the pregnant woman.As a result the abdominal circumference decreases whilst the head circumference remains normal.A midwife usually performs an internal examination on the mother and uses their finger to separate the amniotic membranes from the walls of the cervix.Uterine atony describes a state in which the uterus can no longer effectively contract.Because the uterus cannot contract the blood vessels which were supplying the placenta are not compressed and can therefore bleed profusely.

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