Test ID PSPT Phosphatidylserine/Prothrombin Antibody, IgG and IgM, Serum
Useful For
May be useful for the evaluation of patients with prior positive lupus anticoagulant results who are on direct oral anticoagulant therapy
May be useful as a risk marker for thrombosis in antiphospholipid antibody carriers
Profile Information
Test ID | Reporting Name | Available Separately | Always Performed |
---|---|---|---|
PSPTG | PS/PT Ab, IgG, S | Yes | Yes |
PSPTM | PS/PT Ab, IgM, S | Yes | Yes |
Method Name
Reporting Name
PS/PT Ab, IgG/IgM, SSpecimen Type
SerumOrdering Guidance
Cardiolipin and beta-2 glycoprotein testing are the first-tier test options for most patients. Phosphatidylserine/prothrombin antibodies are considered part of the second-tier workup.
Specimen Required
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
Specimen Minimum Volume
0.4 mL
Specimen Stability Information
Specimen Type | Temperature | Time | Special Container |
---|---|---|---|
Serum | Refrigerated (preferred) | 21 days | |
Frozen | 21 days |
Reference Values
Negative ≤30.0 U
Borderline 30.1-40.0 U
Positive ≥40.1 U
Day(s) Performed
Wednesday
Report Available
2 to 8 daysPerforming Laboratory

CPT Code Information
86148 x 2
LOINC Code Information
Test ID | Test Order Name | Order LOINC Value |
---|---|---|
PSPT | PS/PT Ab, IgG/IgM, S | 97026-9 |
Result ID | Test Result Name | Result LOINC Value |
---|---|---|
PSPTM | PS/PT Ab, IgM, S | 85358-0 |
PSPTG | PS/PT Ab, IgG, S | 85359-8 |