Estrogen Receptor
Label Mnemonic: IERF
Epic Lab Code: LAB1820
Downtime Form: H-1 Surgical Pathology Consult
5238 RCP
Tissue or FNA
Testing Schedule:
0800-1630 Monday through Friday. For additional services, contact Clinical Pathology Resident on-call at pager #3404.
Turn Around Time:
2 days
Reference Range:
The pathologist will provide an interpretive report.
Please send a Surgical Pathology H-1 form to Immunopathology with this request.

If ER studies are desired on previous surgical material, please send a requisition to Immunopathology, 5238 RCP. Provide the patient's name, hospital number and surgical pathology specimen number.

Estrogen Receptor (ER) expression status in breast carcinoma is an important prognostic and predictive biomarker according to recently published guidelines. ER status determination has become a part of the routine assessment of these tumors. About 75% of these tumors are ER positive, and this is associated with a more favorable prognosis than ER negative tumors. Immunohistochemical staining is performed on formalin-fixed, paraffin-embedded sections of tumor. Tumor staining in >1% of tumor nuclei is interpreted as positive.
CPT Code:
88341 Estrogen Receptor on non breast tissue
88342 Estrogen Receptor on non breast tissue
88360 Estrogen Receptor on breast tissue
See also:
Progesterone Receptor, Tissue or FNA