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APER
ESTROGEN RECEPTOR, IMMUNOHISTOCHEMISTRY STAIN

Test Code APER 
Test ESTROGEN RECEPTOR, IMMUNOHISTOCHEMISTRY STAIN 
Description The presence of estrogen receptor (ER) in breast cancer has been shown to be a predictor of prognosis and response to endocrine therapy. The presence of nuclear staining for ER is considered a sign of good prognosis. Breast cancers with ER/PR positivity have demonstrated a better response to hormone therapy than those with only ER positivity.

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