Whilst there was minor variation in the day of OHSS screening (≤0.6 days), 90% of assessments were conducted at 3‐5 days following oocyte retrieval and results were similar in 138 patients screened for OHSS only on day 5 following oocyte retrieval (mean ovarian volume: hCG 173.2, GnRHa 73.6, kisspeptin 50.1 ml). Here, KISS1 is linked to ovarian hyperstimulation syndrome.