Protein S Activity, Plasma
Method Description Describes how the test is performed and provides a method-specific reference
Plasma protein S activity is measured using a clot-based modified activated partial thromboplastin time assay that reflects the patient's protein S cofactor enhancement of the anticoagulant activity of exogenously added APC that proteolytically inactivates factor V (factor Va, also exogenously added to the test system).(Wolf M, Boyer-Neumann C, Martinoli JL, et al: A new functional assay for human protein S activity using activated factor V as substrate. Thromb Haemost 1989 December 29;62:1144-1145)
Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.
Monday through Friday; 12 p.m.