S_FX - Performance: Protein S Activity, Plasma

Test Catalog

Test Name

Test ID: S_FX    
Protein S Activity, Plasma

Method Description Describes how the test is performed and provides a method-specific reference

The functional activity of free protein S is performed on the instrumentation laboratory ACL TOP. It is determined by measuring the degree of prolongation of a prothrombin time in the presence of the recombinant human tissue factor, phospholipids, calcium ions, and activated protein C. The protein S activity is correlated with the prolongation of the clotting time of protein S deficient plasma to which diluted sample has been added. The clotting time is directly proportional to the amount of functional protein S in the patient’s plasma and can be quantified using a standard curve.(Package insert: HemosIL Protein S Activity. Instrumentation Laboratory Company, Bedford, MA, Rev 08/2012)

PDF Report Indicates whether the report includes an additional document with charts, images or other enriched information


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.

Analytic Time Defines the amount of time it takes the laboratory to setup and perform the test. This is defined in number of days. The shortest interval of time expressed is "same day/1 day," which means the results may be available the same day that the sample is received in the testing laboratory. One day means results are available 1 day after the sample is received in the laboratory.

1 day

Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Medical Laboratories until the release of the test result

4 days

Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded

7 days

Performing Laboratory Location The location of the laboratory that performs the test