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HelpTest Code CD19/CD20 CD19/CD20
Useful For
Assessing B-cell depletion related to monoclonal antibody therapy. To be used for monitoring monoclonal antibody therapy.
Synonyms/Keywords
Flow Cytometry, CD19, CD20, CD19/CD20, CD 19, CD 20, Antibody Monitoring
Specimen Requirements
| Fasting Required | Specimen Type | Preferred Container/Tube | Acceptable Container/Tube | Specimen Volume | Specimen Minimum Volume (allows for 1 repeat) |
Pediatric Minimum Volume (no repeat) |
|---|---|---|---|---|---|---|
| No | Whole blood | EDTA | Sodium-heparin Green Top Tube (GTT) | 1.0 mL | 0.5 mL | 0.5 mL |
Collection/Processing Instructions
A CBC with differential is required within 4 hours of collection of specimen for this test; submit results with the specimen for this test or include an order for a CBC with differential.
Specimen must arrive in Flow Cytometry within 48 hours of collection.
Notify Flow Cytometry Lab (800-222-5835, ext 16385) before sending the specimen.
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Whole blood | Room temperature | 48-72 hours |
Rejection Criteria
| Fixed specimens |
|---|
| Specimens more than 72 hours old |
| Refrigerated or frozen |
Test Information
This test was developed and its performance characteristics determined by Marshfield Labs. It has not been cleared or approved by the US Food and Drug Administration. This test is used for clinical purposes. It should not be regarded as investigational or for research.
Absolute counts for this test are based on the CBC results provided at the time of testing, including lymphocyte percentage.
Reference Range Information
| Performing Location | Reference Range |
|---|---|
| Marshfield | Not applicable |
Marshfield Labs Performing Department
Marshfield Labs Flow Cytometry
Performing Information
| Performing Location | Day(s) Test Performed | Analytical Time | Methodology/Instrumentation |
|---|---|---|---|
| Marshfield | Monday through Friday, days only | 1 day | Flow Cytometry |
CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 88184 | 1 | Flow Cytometry, first marker | ||
| 88185 | 1 | Additional marker, each |
Outreach CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 88184 | 1 | Flow Cytometry, first marker | ||
| 88185 | 1 | Additional marker, each |
Ordering Applications
| Ordering Application | Description |
|---|---|
| Centricity | CD19 CD20 Antibody Monitoring |
| Cerner | CD19 CD20 Antibody Monitoring |