FIELD : medicine. SUBSTANCE : group of inventions relates to the field of devices and methods for testing biological fluids. Integrated testing device comprises a test component, a reservoir for a test fluid, a control vessel and a fluid delivery actuator, wherein operation of the fluid delivery actuator causes the test fluid to be released from the reservoir into the control vessel. Control vessel is adapted to provide a controlled discharge of test fluid onto the test component through one or more openings made in the control vessel. Method for testing a biological fluid and a testing device are also disclosed. EFFECT : group of inventions provides controlled release of test liquid directly onto the test component due to the use of a control vessel located between the vessel and the test material, as a result of which the accuracy of the test is improved. 13 cl, 8 dwg