Collaborative Stage

Note 1: Chromogranins are a family of proteins in secretory granules found throughout the neuroendocrine system. Serum Chromogranin A (CgA) has been shown to be a useful marker for neuroendocrine tumors.
Note 2: Record, to the nearest nanogram/milliliter (ng/ml), the highest CgA lab value documented in the medical record prior to treatment. For example, a pretreatment CgA of 400 ng/ml would be recorded as 400.
Note 3: Code 000 is reserved for exactly 0 ng/ml (no measurable amount of CgA). Do not round tiny values down to 0 ng/ml; any measured value less than or equal to 1 ng/ml should be coded 001. For code 001, also round 1.1-1.4 ng/ml down to 1 ng/ml. For codes 002-980, round values to the nearest ng/ml.
Note 4: Use code 997 if there is no actual pretreatment CgA lab value available but an interpretation of the test result is stated.

Code	Description
000	0 nanogram/milliliter (ng/ml)
001	1 or less ng/ml Stated as less than 1 ng/ml with no exact value
002-979	002-979 ng/ml (Exact value to nearest ng/ml)
980	980 or greater ng/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 2
Serum Chromogranin A (CgA) Lab Value