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. 2017 May 23;2017(5):CD002811. doi: 10.1002/14651858.CD002811.pub4

3. Aboulghar and Rizk classification of ovarian hyperstimulation syndrome (1999).

Moderate Severe Grade A Severe Grade B Severe Grade C
Discomfort, pain, nausea, distension, ultrasonic evidence of ascites and enlarged ovaries, normal haematological and biological profile Dyspnoea, oliguria, nausea, vomiting, diarrhoea, abdominal pain, clinical evidence of ascites, marked distension of abdomen or hydro‐thorax, US showing large ovaries and marked ascites, normal biochemical profile Grade A plus massive tension ascites, markedly enlarged ovaries, severe dyspnoea and marked oliguria, increased haematocrit, elevated serum creatinine and liver dysfunction Complications such as respiratory distress syndrome, renal shut‐down, or venous thrombosis