Spontaneous Ovarian Hyperstimulation Syndrome in a Triplet Pregnancy

Table 1

Grade	Symptoms
Mild OHSS	Abdominal bloating
	Mild abdominal pain
	Ovarian size usually <8 cm
Moderate OHSS	Moderate abdominal pain
	Nausea/vomiting
	Ultrasound evidence of ascites
	Ovarian size usually 8–12 cm
Severe OHSS	Clinical ascites
	Oliguria
	Haemoconcentration >0.45
	Hypoproteinemia
	Ovarian size usually >12 cm
Critical OHSS	Tense ascites
	Haemoconcentration >0.55
	White cell count >25×10^9/L
	Oligo/anuria
	Thromboembolism
	Acute respiratory distress syndrome