Anti-Phosphatidylserine Antibodies (APL)
Prenatal Screening Laboratory
IgG, IgM, and IgA antibodies to phosphatidylserine by ELISA
Specimen Required:
Serum: 2 mL
Room temperature or 4°C
Days Test Set Up:
Run once per week
Analytic Time:
48 hours
Reference Values:
> 98 percentile = Elevated
Reported out in standardized units as IgG Phospholipid Level (GPL), IgM Phospholipid Level (MPL), IgA Phospholipid Level (APL).
CPT Code(s):
86148 x3 units
Relevance:
The presence of anti-phospholipid antibodies is associated with systemic lupus erythematosus (SLE) or lupus-like disease, arterial or venous thrombosis, thrombocytopenia, recurrent pregnancy loss, postnatal maternal complications, migraine headaches, cerebrovascular accident, transient ischemic attack, or stroke.
Notes:
Includes three specific assays for antiphosphatidylserine antibodies.
Some laboratories have reported that 10-25% of APA positive patients were positive for aPL but negative for anticardiolipin antibodies (aCL).
The FBR performs both the aCL and aPL assays as part of the Antiphospholipid antibody syndrome panel (APS). Testing for both phospholipid antibodies is more clinically relevant than testing for either alone; however, both aCL and aPL may be ordered as individual tests.
Reference(s)