Silica Clot Time

Message

Performed in the Hematology Laboratory x5475, 76.

Test Code

N/A (see LASCR)

Alias/See Also

Part of the LASCR panel (Lupus Anticoagulant).
Cannot be ordered as a stand alone test.

CPT Codes
85705

Preferred Specimen

plasma

Minimum Volume

2.7 mL sodium citrate plasma. Sample MUST be drawn to minimum fill line on the tube or the sample will be rejected as QNS.

Transport Container

2, Light Blue Top (Sodium Citrate), 1.8 or 2.7 mL draw

Transport Temperature

Room Temperature

Specimen Stability

Refrigerator Stability: 4 hours
Plasma is stable for 6 months frozen at -70C

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Gross hemolysis, QNS, clotted

Methodology
optical/clotting

Setup Schedule

2x/week

Limitations

Screen and Confirm results are not affected by bilirubin up to 30 mg/dL, triglycerides up to 850 mg/dL, UF heparin up to 0.5 U/mL, LMW heparin up to 1.0 U/mL.
LA assays based on different properties appear to be more or less sensitive to certain subgroups of LAs. Therefore at least two screening assays, based on different properties, should be performed before the positibility of lupus anticoagulants are excluded.

Reference Range

Negative

Clinical Significance

Test for Lupus Anticoagulants.

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.