Serum Beta-2 Microglobulin Pretreatment Level

Notes

**Note 1:** Serum microglobulin is part of the Revised International Staging (RISS). Use the cut points listed in the table below regardless of the lab's reference range. **Note 2:** Record this data item based on a blood test performed at diagnosis (pre-treatment). In the absence of the lab test, a physician's statement of the exact value can be used. Use the highest value available. **Note 3:** If there is no mention of the serum beta-2 microglobulin, code 9. **Note 4:** If Schema Discriminator 1: Plasma Cell Myeloma Terminology is coded to 1 or 9, code 5.

Default

9

NAACCR Item

NAACCR #3931

Metadata

SSDI
Code Description
0 β2-microglobulin < 3.5 mg/L
1 β2-microglobulin ≥ 3.5 mg/L < 5.5 mg/L
2 β2-microglobulin ≥ 5.5 mg/L
5 Schema Discriminator 1: Plasma Cell Myeloma Terminology coded to 1 or 9
7 Test ordered, results not in chart
9 Not documented in medical record Serum Beta-2 Microglobulin Pretreatment Level not assessed or unknown if assessed