Good day, and welcome to Medical Laboratory Professionals week, April 22–28, 2018. Congratulations and thanks to medical laboratory technicians, scientists, managers, and directors worldwide whose products support at least 70% of medical and surgical decision-making. As promised, I have, with the help of colleagues, prepared a special Lab Week hemostasis case study series. Please review and post your answers and comments to Fritsma Factor using the Contact link or by emailing to me, George, at [email protected]. You may also comment on previous entries using the Comment link. Also please feel free to post a case of your own. Enjoy!