CD20 Assay
Test Code
CD20
Description
Collect
Draw one green top (sodium or lithium heparin) or lavender top (EDTA) vacutainer tube.
Specimen Preparation
Handling: Do not centrifuge! Keep at room temp (18-22°C).
Preferred volume: 4mL
Pediatric Collection
Minimum volume: 1mL blood
Unacceptable Conditions
Frozen, clotted, hemolyzed, spun down, citrate anticoagulant (blue top)
Storage Transport Temp
Maintain and transport specimens at room temperature (18-22°C).
Ship specimens Priority Overnight via Fed Ex in container sufficiently insulated to avoid temperature extremes (<10°C and >37°C).
Stability
48 hours at room temperature (18-22°C).
Notes
CBC with Differential results from within 3 days of draw must also be provided or a lavender top included with required specimen to run CBC at ADx.
Samples are accepted Monday through noon on Fridays.
Reference Interval
Lymphocyte Subset Normal Range Chart
Interpretation
This test is useful for assessing B Cell percentages and numbers and assists in the evaluation of humoral immunodeficiences. It is also useful for monitoring depletion of CD20 B cells following anti-CD20 monoclonal (e.g. Rituximab) therapy.
CPT Code
86355