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Grading of OHSS.
| Mild OHSS | Grade 1 – Abdominal distension and discomfort |
| Grade 2 – Grade 1 + vomiting, nausea + ovarian size (5–12 cm) | |
| Moderate OHSS | Grade 3 – Mild OHSS + ascites |
| Severe OHSS | Grade 4 – Moderate OHSS + effusion (pleural and pericardial) |
| Grade 5 – Grade 4 + biochemical imbalance in the form of hemoconcentration, coagulaopathy, deranged LFT, RFT |
