CA-125 (Carbohydrate Antigen 125) Pretreatment Interpretation
**Note 1:** Physician statement of CA-125/CA-125 II pretreatment interpretation can be used to code this data item when no other information is available.
**Note 2:** Carbohydrate Antigen 125 (CA-125)/CA-125 II, also known as cancer antigen 125, mucin 16, or MUC16, is a protein which in humans is encoded by the MUC16 gene. CA-125 is a tumor marker or biomarker that may be elevated in the blood of some patients with ovarian cancer.
**Note 3:** Record only the blood or serum CA-125/CA-125 II interpretation for this data item. Do not record CA-125 test results based on fluid from the chest or abdominal cavity.
**Note 4:** Record the CA-125/CA-125 II status prior to treatment.
**Note 5:** Normal values may vary with patient age and from lab to lab. The typical human reference ranges are 0 to less than or equal 35 units per milliliter (U/mL). This is equivalent to kU/L.
**Note 6:** Code 9 if there is no statement that the CA-125/CA-125 II is positive/elevated, negative/normal, and the lab value with its normal range (from which you can determine interpretation) is not documented.