1. Golan classification of OHSS (1989).

Classification	Size ovaries	Grade	Symptoms
MILD	5‐10 cm	grade 1:	abdominal tension and discomfort
		grade 2:	grade 1 signs plus nausea, vomiting, and/or diarrhoea
MODERATE	>10 cm	grade 3:	grade 2 signs plus ultrasound evidence of ascites
SEVERE	>12 cm	grade 4:	grade 3 signs plus clinical evidence of ascites and/or pleural effusion and dyspnoea
		grade 5:	grade 4 signs plus haemoconcentration increased blood viscosity, hypovolaemia, decreased renal perfusion, oliguria