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Catalog ID Plt Dir Platelet Associated Antibodies, Direct Assay

Important Note

Do not collect on Saturdays, or on Sundays or FedEx holidays prior to 2pm. Specimen must arrive at ARUP within 48 hours of collection.

Additional Codes

CPOE: Ref Platelet Associated Antibodies, Direct Assay

DOE: Ref Plt Dir Ab

Specimen

Lavender EDTA tube, collect 4.0 mL (minimum 1.0 mL) blood

Whole blood, CRITICAL ROOM TEMPERATURE - must be received by ARUP <48 hours from collection

Rejection Criteria

Serum, plasma, clotted specimen, hemolyzed specimen, frozen specimen, refrigerated specimen, specimen older than 48 hours, insufficient quantity, unlabelled specimen

Interpretative Information

Negative (IgG & IgM): No excess antibodies were associated with the patient's platelets. An immune cause of thrombocytopenia is unlikely.
Positive (IgG and/or IgM): An increase in platelet associated immunoglobulin is noted. An immune cause of thrombocytopenia should be considered. However, many conditions can result in an increase in platelet associated antibodies; for example, IgM rheumatoid factor antibodies.
Strong Positive (IgG and/or IgM): A definite increase in platelet associated immunoglobulin is noted and an immune cause of thrombocytopenia should be considered. However, many conditions can result in an increase in platelet associated antibodies; for example, IgM rheumatoid factor antibodies.

Performing Lab

ARUP Laboratories

Turn-Around-Time

2-3 days

Reference Values

Negative