Collaborative Stage

Note 1: Carbohydrate Antigen 19-9 (CA 19-9) is a tumor marker that has value in the management of certain malignancies.
Note 2: Record to the nearest tenth in Units/milliliter (U/ml), the highest CA 19-9 lab value documented in the medical record prior to treatment. For example, code a pretreatment CA 19-9 value of 60 U/ml as 600.
Note 3: Code 000 is reserved for exactly 0.0 U/ml (no measurable amount of CA 19 9). Do not round tiny values down to 0.0 U/ml; any measured value less than or equal to 0.1 U/ml should be coded 001. For code 001, also round 0.11-0.14 U/ml down to 0.1 U/ml. For codes 002-979, round values to the nearest tenth of a U/ml.
Note 4: For an uncertain value, record the stated closest value. For example, code a value stated as "less than 0.5 U/ml" as 005.

Code	Description
000	0.0 Units/milliliter (U/ml) exactly
001	0.1 or less U/ml Stated as less than 0.1 U/ml with no exact value
002-979	0.2 - 97.9 U/ml (Exact value to nearest tenth in U/ml)
980	98.0 or greater U/ml
988	Not applicable: Information not collected for this case (May include cases converted from code 888 used in CSv1 for "Not applicable" or when the item was not collected. If this item is required to derive T, N, M, or any stage, use of code 988 may result in an error.)
997	Test ordered, results not in chart
998	Test not done (test not ordered and not performed)
999	Unknown or no information Not documented in patient record

CS Site-Specific Factor 1
Carbohydrate Antigen 19-9 (CA 19-9) Lab Value