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| 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 × 109/L | |
| Oligo/anuria | |
| Thromboembolism | |
| Acute respiratory distress syndrome | |
