What assay does your lab use as an initial protein S screen?

Primary tabs

Total protein S antigen
3% (1 vote)
Free protein S antigen
43% (16 votes)
Clot-based protein S activity
30% (11 votes)
Chromogenic protein S activity
8% (3 votes)
Combination of protein S antigen and activity
5% (2 votes)
We do not screen for protein S deficiency
11% (4 votes)
Total votes: 37