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This is a possible complication of ovulation induction. In its mild form it is of little significance but in its severe form it is potentially dangerous.
Mild OHSS is characterised by some abdominal distension and discomfort and there may be sickness and diarrhoea. The ovaries may enlarge up to 12 cms. In moderate OHSS there may be some excess of fluid in the abdomen. Severe OHSS is characterised by free fluid in the abdomen that can be detected clinically, even without ultrasound. Occasionally there may be changes in the blood. It is believed that there are about 100,000 cycles of assisted conception annually around the world and about 100 cases of severe OHSS. The risk of severe OHSS is therefore one in a thousand IVF treatments.
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