Lipiodol Prior to FET (LIFE)

Lipiodol®, treatment will be performed by a HSG technique with X-ray screening on day 3 or day 5 after oocyte retrieval. The contrast medium will be Lipiodol Ultra Fluide® (Guerbet, France), an iodized poppy seed oil obtained by substitution of ethyl esters for the glyceryl esters of Lipiodol®. One millilitre of Lipiodol Ultra Fluide® contains 0.48g iodine. Women will lie in the left lateral or supine position. Radiologists will use a 'no touch' technique after applying antiseptic solution to the cervix. Uterine cannulation using the Cook HSG catheter will be applied to conduct Lipiodol® treatment. Prewarmed (37oC) Lipiodol® will be slowly instilled, with intermittent fluoroscopic X-ray guidance. Up to 10 ml of Lipiodol® will be slowly injected into the uterus and directly monitored by fluoroscopy. If intravasation was observed on X-ray (contrast apparent in the venous system), instillation will be stopped immediately.