Peripheral Blood Involvement
This input is used for staging
Notes
**Note 1:** The categories for peripheral blood involvement (B rating) are * B0: No significant blood involvement * B1: Low blood tumor burden * B2: High blood tumor burden **Note 2:** Physician statement of B rating can be used to code this data item. **Note 3:** If counts or percentages of neoplastic cells and clonality test results are available, but a B rating is not stated by the physician, the registrar can use the information and assign a B rating and code this data item accordingly. If this information is not available, code 9.| Code | Description | B Map |
|---|---|---|
| 0 | Absence of significant blood involvement 5% or less of peripheral blood lymphocytes are atypical (Sezary) cells Clone unknown Stated as B0 |
B0 |
| 1 | Absence of significant blood involvement 5% or less of peripheral blood lymphocytes are atypical (Sezary) cells Clone negative Stated as B0a |
B0a |
| 2 | Absence of significant blood involvement: 5% or less of peripheral blood lymphocytes are atypical (Sezary) cells Clone positive Stated as B0b |
B0b |
| 3 | Low blood tumor burden More than 5% of peripheral blood lymphocytes are atypical (Sezary) cells but does not meet the criteria of B2 Clone unknown Stated as B1 |
B1 |
| 4 | Low blood tumor burden More than 5% of peripheral blood lymphocytes are atypical (Sezary) cells but does not meet the criteria of B2 Clone negative Stated as B1a |
B1a |
| 5 | Low blood tumor burden More than 5% of peripheral blood lymphocytes are atypical (Sezary) cells but does not meet the criteria of B2 Clone positive Stated as B1b |
B1b |
| 6 | High blood tumor burden Greater than or equal to 1000 Sezary cells per microliter (uL) Clone positive Stated as B2 |
B2 |
| 7 | Test ordered, results not in chart | BX |
| 9 | Not documented in medical record Peripheral Blood Involvement not assessed or unknown if assessed |
BX |
| <BLANK> | Death Certificate Only, no value provided | BX |