Lupus Anticoag ST-LA (LAS)
Department: Coagulation
Test Synonym(s): LAB478, Hexagonal Phase Phospholipid Testing, LAS, LASTA Clot
CPT Codes: 85597
Methodology: Clotting
Reference Range: Negative
Tube Type: Light blue top (Sodium Citrate)
Specimen: Citrated platelet poor plasma - Requires double centrifugation if sending a plasma aliquot. Aliquot(s) must be frozen if not received by lab within 4 hours of collection.
Alternate Specimen: None
Pediatric Requirements: Pediatric: Two 2.7mL Light blue top - 3.2% Sodium Citrate. Neonatal: Two 1.8mL Light blue top - 3.2% Sodium Citrate.
Volume: 1.0 mL plasma
Minimum Volume: 1.0 mL plasma
Temperature: Room Temperature for Light blue top tube, must be received within 4 hours of draw. Plasma aliquot(s) must be frozen if not received by lab within 4 hours of collection.
Stability: Room temperature: 4 hours, Frozen: -70 C for one month
Reasons for Rejection: Clotted sample, incorrectly filled tubes, incorrect tube type, grossly hemolyzed sample, grossly lipemic sample, grossly icteric sample, whole blood >4.0 hours old
Days Performed: Twice weekly
Times Performed: Mornings
TAT: 4 days
Significance: Direct Thrombin and both Direct and Indirect Xa inhibitors may interfere with these assays.
Special Instructions: This test on its own is not adequate for the evaluation of the Antiphospholipid Antibody Syndrome. A more appropriate test for work up of Antiphospholipid Antibody Syndrome is the Antiphospholipid Ab Pnl [LAB2307]. Performed twice weekly. Collect partial waste tube if using butterfly device. Do not send on ice. Deliver to lab immediately.
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