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Assays

CD4

Immunohistochemistry (IHC) · Oncology
CD4 is not found on immature thymocytes. The antibody is useful for the identification of anaplastic large cell lymphomas, unspecified peripheral T-cell lymphomas and mycosis fungoides.

Table of Contents

Assay Description


CD4 is not found on immature thymocytes. The antibody is useful for the identification of anaplastic large cell lymphomas, unspecified peripheral T-cell lymphomas and mycosis fungoides.

Specimen Requirements


A formalin-fixed, paraffin-embedded (FFPE) tissue block is preferred specimen type or one (1) unbaked, unstained slide cut at 4-5 microns for H&E staining (required) and two to three (2-3) positively charged unstained slides cut at 3-4 microns for each test/antibody ordered.

Storage and Transport


A formalin-fixed, paraffin-embedded (FFPE) tissue block is preferred specimen type or one (1) unbaked, unstained slide cut at 4-5 microns for H&E staining (required) and two to three (2-3) positively charged unstained slides cut at 3-4 microns for each test/antibody ordered.

Specimen Rejection Criteria


All specimens must be submitted according to the test directory instructions.  Before submitting specimen, please carefully review specimen requirements.


Listed below are possible causes for delays in specimen processing or possible specimen rejections or cancellations:


  • No patient identification on requisition form
  • No patient identification on specimen container or slides
  • No referring provider
  • No account information provided
  • No test ordered on requisition
  • No specimen source provided
  • Inappropriate specimen type
  • Insufficient volume for analysis
  • Inappropriate specimen container
  • Improper specimen transport
  • Specimen leaked in transport
  • Specimen submitted in incorrect or expired transport media
  • Slides broken beyond repair on receipt
  • Conflict between patient name on specimen and requisition form
  • Specimen not properly preserved
  • Sample containing a needle

A representative from Client Services will attempt to contact your office  to resolve specimen problems.  Additional documentation may be requested from your office to be returned by fax.  In the event that resolution is not possible, the specimen may be returned to your office.

Turn Around Time (TAT)


2-3 Days.
CPT Codes*

88341, 88342, 88360