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Test ID CD40 B-Cell CD40 Expression by Flow Cytometry, Blood

Useful For

Evaluating patients for hyper-IgM type 3 (HIGM3) syndrome due to defects in CD40, typically seen in patients less than 10 years of age

 

Assessing B-cell immune competence in other clinical contexts, including autoimmunity, malignancy, and transplantation

Genetics Test Information

Homozygous variants in the CD40 gene cause autosomal recessive hyper-IgM syndrome type 3. The CD40 gene is located on chromosome 20q12-q13.2.

Method Name

Flow Cytometry

Reporting Name

CD40 by Flow, QL, B

Specimen Type

Whole Blood EDTA


Ordering Guidance


This test is not used to detect in CD40L expression (CD154), which is responsible for X-linked hyper-IgM syndrome (HIGM1); see XHIM / X-Linked Hyper IgM Syndrome, Blood.



Shipping Instructions


Specimens are required to be received in the laboratory weekdays and by 4 p.m. on Friday. Collect and package specimen as close to shipping time as possible.

 

It is recommended that specimens arrive within 24 hours of collection.

 

Samples arriving on the weekend and observed holidays may be canceled.



Necessary Information


Ordering physician name and phone number are required.



Specimen Required


Container/Tube: Lavender top (EDTA)

Specimen Volume: 3 mL

Collection Instructions: Send whole blood specimen in original tube. Do not aliquot.

Additional Information: For serial monitoring, it is recommended that specimens are collected at the same time of day.


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Whole Blood EDTA Ambient 72 hours PURPLE OR PINK TOP/EDTA

Reference Values

Present (normal)

Day(s) Performed

Monday through Friday

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

88184

LOINC Code Information

Test ID Test Order Name Order LOINC Value
CD40 CD40 by Flow, QL, B In Process

 

Result ID Test Result Name Result LOINC Value
89009 CD40 by Flow, QL, B In Process

Test Classification

This test was developed using an analyte specific reagent. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.

Report Available

3 to 4 days

NY State Approved

Yes