Results are generally available in 2 business days.

Monday through Friday, 8 am to 5 pm.

Per ASCO/CAP guidelines, breast tissue should be fixed in 10% neutral buffered formalin for 6 to 72 hours for hormone receptor immunohistochemical analysis. Ischemic time prior to fixation should be kept to a minimum (less than 1 hour). OHSU immunohistochemistry laboratory participates in proficiency testing for hormone receptor studies. Submit tissue to Surgical Pathology with a Laboratory Requisition. (Opens in a new window)

Immunohistochemistry Lab: 503-494-5755.

Estrogen Receptor (ER) and Progesterone Receptor (PR) immunohistochemical studies allow for the semi-quantitative detection of Estrogen receptor (clone SP1) and Progesterone receptor (clone 1E2) antigen in sections of formalin fixed, paraffin embedded tissue, and is performed on an automated slide stainer according to ASCO/CAP guidelines. This testing is indicated as an aid in the management, prognosis, and prediction of therapy outcome for breast cancer.

ER/PR, ER, ERPR, Estrogen Receptor, PR, Progesterone Receptor