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24730 CD19/CD20

CD19/CD20
Test Code: CD19/CD20
Synonyms/Keywords
​Flow Cytometry, CD19, CD20, CD19/CD20, CD 19, CD 20, Antibody Monitoring
Useful For
Assessing B-cell depletion related to monoclonal antibody therapy.  To be used for monitoring monoclonal antibody therapy.​
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​
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Friday, days only​ 1 day​ Flow Cytometry​
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
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
88184​ ​ ​1 ​Flow Cytometry, first marker ​
88185​ ​ ​1 ​​Additional marker, each ​
Classification

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.

Synonyms/Keywords
​Flow Cytometry, CD19, CD20, CD19/CD20, CD 19, CD 20, Antibody Monitoring
Ordering Applications
Ordering Application Description
​Centricity ​CD19 CD20 Antibody Monitoring
​Cerner ​CD19 CD20 Antibody Monitoring
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
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
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​
Useful For
Assessing B-cell depletion related to monoclonal antibody therapy.  To be used for monitoring monoclonal antibody therapy.​
Reference Range Information
   Performing Location     ​ ​     Reference Range     
​Marshfield Not applicable
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Friday, days only​ 1 day​ Flow Cytometry​
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
88184​ ​ ​1 ​Flow Cytometry, first marker ​
88185​ ​ ​1 ​​Additional marker, each ​
Classification

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.

For most current information refer to the Marshfield Laboratory online reference manual.