Posted Date
Effective Date
Update Type
Test Discontinued
CPT Code
85306
Order Code
PSACT
TEST DISCONTINUED
Protein S Activity
Order Code: PSACT
Fee Code: 32516 (CPT 85306)
LOINC: 13051-8
The MLabs Coagulation Laboratory will discontinue their Protein S Activity assay effective November 13, 2024. Requests for this test will be sent to Mayo Clinic Laboratories test ID SFX (order code MSFX) (Fee Code 22196). This test is used as a second-order testing for diagnosis of congenital or acquired protein S deficiency, i.e., as an adjunct to initial testing based on results of a protein S antigen assay. The Protein S Antigen, Free (order code PSAGF) assay is the recommended test for screening for inherited Protein S Deficiency.