Larger image First Reported Occurrence And Treatment Of Spaceflight Medical Risk On ISS, LSU “Ultrasound examinations of the astronauts’ internal jugular veins were performed at scheduled times in different positions during the mission. Results of the ultrasound performed about two months into the mission revealed a suspected obstructive left internal jugular venous thrombosis (blood clot) in one astronaut. The astronaut, guided in real time and interpreted by two independent radiologists...| Space Life Science Archives - NASA Watch
To its credit NASA (often with NIH) has looked at physiology factors that differentially affect female vs male astronauts.| NASA Watch