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Syphilis Antibody Cascading Reflex (Reverse Algorithm)
Test CodeSYABCX or 90349
CPT Codes
86780
Includes
If T. Pallidum Antibody is equivocal or reactive, then RPR Screen will be performed at an additional charge (CPT code: 86592).
If RPR Screen is reactive, then RPR titer will be performed at an additional charge (CPT code: 86593).
If the RPR screen is nonreactive, then T. pallidum Antibody, Particle Agglutination will be performed at an additional charge (CPT code: 86780).
If RPR Screen is reactive, then RPR titer will be performed at an additional charge (CPT code: 86593).
If the RPR screen is nonreactive, then T. pallidum Antibody, Particle Agglutination will be performed at an additional charge (CPT code: 86780).
Preferred Specimen
3 mL serum
Minimum Volume
1.4 mL
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 30 days
Refrigerated: 7 days
Frozen: 30 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis; lipemia
Methodology
Immunoassay
Setup Schedule
Sunday - Saturday
Report Available
1-4 days
Reference Range
Nonreactive
Clinical Significance
This test is used to aid in the diagnosis of syphilis using the reverse algorithm. The algorithm starts with the Treponema pallidum Antibody immunoassay, a treponemal serologic test. If positive, samples will be further tested using RPR, a nontreponemal (lipoidal antigen) serologic test, and if reactive will reflex to titer. T. pallidum positive samples that do not confirm with RPR will be tested by a second treponemal test, Treponema pallidum Particle Agglutination (TP-PA).
Performing Laboratory
med fusion
