Ovarian Hyperstimulation Syndrome (OHSS)

An exaggerated response to fertility drugs — usually mild, rarely severe.

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Medically reviewed by Dr. Adnan Jabbar

· Updated April 2026

OHSS

Plain-English guide for patients and families.

OHSS causes ovaries to swell and fluid can shift into the abdomen. Risk rises with high response (often high AMH / many follicles). Clinics use antagonist protocols, trigger choices (e.g. buserelin vs hCG), coasting, and freeze-all strategies to reduce risk.

Warning symptoms

Rapid weight gain, severe abdominal pain, vomiting, shortness of breath, or reduced urine output after stimulation — contact your clinic urgently.

AI Information

Educational

OHSS is the most significant iatrogenic complication of fertility treatment. Modern prevention strategies have reduced severe OHSS rates to under 2% in well-managed programs. The shift from hCG triggers to GnRH agonist triggers in high-risk patients, combined with freeze-all strategies, has been transformative for patient safety.

Key Points

OHSS severity ranges from mild (bloating, mild discomfort) to severe (fluid in abdomen/chest, kidney compromise, blood clots).
Risk factors include young age, low BMI, PCOS, high AMH, large number of follicles, and high estradiol levels.
GnRH antagonist protocols with agonist trigger have dramatically reduced severe OHSS in high-risk patients.
Freeze-all strategy (no fresh transfer) eliminates late-onset OHSS that occurs with pregnancy.
Severe OHSS requires hospital monitoring — patients should know warning signs to seek urgent care.

Who Should Know This?

All patients undergoing IVF stimulation, especially those with PCOS, high AMH, previous OHSS, or many follicles developing during monitoring.

Clinical Context in Pakistan

Patient safety is a core priority at IVF Experts Lahore. Dr. Adnan Jabbar uses evidence-based OHSS prevention including antagonist protocols, tailored trigger strategies, and freeze-all when indicated to minimise risk while maintaining excellent outcomes.

Important Disclaimer

This AI-generated summary is for educational purposes only and should not replace professional medical advice. Always consult with Dr. Adnan Jabbar or your fertility specialist for personalised clinical guidance tailored to your specific situation.