I have a patient who is post-partum day 7 who required a V-Q (ventolation - perfusion) scan. The radiologist states she should wait 48-72 hours before resuming use of breast milk... based on gut feeling. Anyone have any data on metabolism, milk concentration etc. Briggs & Hale do not elucidate (but I must admit I only have the '96 Hale with me). The drugs used are Technecium 99 - intravenous and Xenon - inhaled TIA Pamela Berens MD OB/GYN