Wallach's Interpretation of Diagnostic Tests: Pathways to Arriving at a Clinical Diagnosis (1197 page)

BOOK: Wallach's Interpretation of Diagnostic Tests: Pathways to Arriving at a Clinical Diagnosis
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   ASA also inhibits platelet aggregation and, therefore, prolongs bleeding time.
   Interpretation
   See discussion of salicylate poisoning in Chapter
14
.
   Limitations
   Requires specific test request; not usually detected in routine screens:
   Color test:
   Limit of detection: 40–50 μg/mL
   Suitable for blood, serum, plasma, urine
   Not recommended for quantitative purposes due to interferences from metabolites, AND plasma constituents
   Immunoassay
   Serum/plasma.
   With a Limit of quantitation: 50 μg/mL.
   Not whole blood.
   Anticoagulants (heparin, citrates, oxalates, EDTA) do not interfere.

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