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APS100
S-100 PROTEIN, IMMUNOHISTOCHEMISTRY STAIN

Test Code APS100 
Test S-100 PROTEIN, IMMUNOHISTOCHEMISTRY STAIN 
Description S-100 protein is a marker protein for a variety of tumor types, e.g., glioma, melanoma, neurilemmoma, neurofibroma, nevi, as well as histiocytosis X. It can be used in conjunction with antisera to epithelial membrane antigen (EMA) or keratin and leukocyte common antigen in the investigation of undifferentiated large cell malignant neoplasms, see "Epithelial Membrane Antigen (EMA), Immunohistochemistry Stain," or "Leukocyte Common Antigen (LCA), Immunohistochemistry Stain."

NOTE: This test is usually ordered in conjunction with a pathology consultation. The pathology professional component will be billed separately by the consulting pathologist. 

Specimen Formalin-fixed or paraffin-embedded tissue specimen. 
Reference Values An interpretive report will be issued. 
Analytic Time 2 Days 
Day(s) Test Set Up Monday through Friday 
CPT Code(s) 88342