ER (Estrogen Receptor) Percent Positive or Range
**Note 1:** Physician statement of ER (Estrogen Receptor) Percent Positive or Range can be used to code this data item.
**Note 2:** Code this data item using the same report used to record Estrogen Receptor Summary [NAACCR Data Item #3827].
**Note 3:** If ER is negative, or percentage is less than 1%, code 000.
**Note 4:** The actual ER (1-100%) percent takes priority over the range codes.
**Note 5:** If ER is positive but percentage is unknown, code XX7.
**Note 6:** Ranges for the codes in this data item are defined in steps of 10 which correspond to the CAP protocol. If a range in a report is given in steps other than those provided in the codes, code to the range that contains the lowest number of the range in the report.
* *Example 1:* Report says 1-5%. Code R10 (1-10%)
* *Example 2:* Report says 90-95%. Code R90 (81-90%)