After completing the Airway and Respiration portion of Tactical Field Care, the next focus is on Circulation.

The Circulation portion of Tactical Field Care consists of determining if a patient is in shock, and if they need intravenous (IV) access. Not all casualties need IVs. The intravenous and intraosseous routes and suggested indications and techniques are discussed. The proper use and administration of tranexamic acid (TXA) is also discussed as an adjunct to help reduce blood loss from internal hemorrhage. The concepts and suggested types of fluids for resuscitation are also discussed, including the use of blood and blood products if available, and the avoidance of over-resuscitation.