The design, development and documentation of software. See software engineer, systems analysis & design, programming, object-oriented programming, software metrics, CASE and Systemantics.
Overview. Posttransplant lymphoproliferative disease (PTLD) is an unusual entity that has many features of an immune system malignancy. It is characterized by uncontrolled proliferation of lymphoid lineage cells (typically B cells, rarely non-B lineage) in a context of posttransplant immunosuppression.
A partial thromboplastin time (PTT) test helps doctors assess your bodyâs ability to form blood clots. Each time you bleed, it triggers a series of reactions known as the âcoagulation cascade.â Coagulation is the process your body uses to stop blood loss. Cells called platelets create a plug to cover the damaged tissue and then your bodyâs 13 clotting factors interact to produce a blood clot.