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Test ID CD1A CD1a Immunostain, Technical Component Only

Ordering Guidance

This test includes only technical performance of the stain (no pathologist interpretation is performed). If diagnostic consultation by a pathologist is required order PATHC / Pathology Consultation.

Shipping Instructions

Attach the green pathology address label and the pink Immunostain Technical Only label included in the kit to the outside of the transport container.

Specimen Required

Supplies: Immunostain Technical Only Envelope (T693)

Specimen Type: Tissue

Preferred: 2 Unstained positively charged glass slide (25- x 75- x 1-mm) per test ordered; sections 4-microns thick.

Acceptable: Formalin-fixed, paraffin-embedded (FFPE) tissue block

Useful For

Marker of Langerhans cells and immature T cells

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
IHTOI IHC Initial, Tech Only No No
IHTOA IHC Additional, Tech Only No No

Method Name

Immunohistochemistry (IHC)

Reporting Name

CD1a IHC, Tech Only

Specimen Type


Specimen Stability Information

Specimen Type Temperature Time Special Container
TECHONLY Ambient (preferred)

Clinical Information

CD1a is a membrane surface glycoprotein that is expressed in Langerhans cells and immature T cells. CD1a expression is useful in phenotyping acute lymphoblastic leukemia/lymphoma of T-cell lineage and in the diagnosis of Langerhans cell histiocytosis.


This test does not includes pathologist interpretation; only technical performance of the stain. (no pathologist interpretation is performed). If diagnostic consultation by a pathologist interpretation is required order PATHC / Pathology Consultation for a full diagnostic evaluation or second opinion of the case.


The positive and negative controls are verified as showing appropriate immunoreactivity and documentation is retained at Mayo Clinic Rochester. If a control tissue is not included on the slide, a scanned image of the relevant quality control tissue is available upon request. Contact 855-516-8404.


Interpretation of this test should be performed in the context of the patient's clinical history and other diagnostic tests by a qualified pathologist.

Clinical Reference

1. Nasiri S, Bidari Zerehpoosh F, Abdollahimajd F, Younespour S, Esmaili Azad M: A comparative immunohistochemical study of epidermal and dermal/perifollicular Langerhans cell concentration in discoid lupus erythematosus and lichen planopilaris: a cross-sectional study. Lupus. 2018;27(14):2200-2205. doi:10.1177/0961203318808587

2. Wang P, Peng X, Deng X, Gao L, Zhang X, Feng Y: Diagnostic challenges in T-lymphoblastic lymphoma, early T-cell precursor acute lymphoblastic leukemia or mixed phenotype acute leukemia: A case report. Medicine (Baltimore). 2018;97(41):e12743. doi:10.1097/MD.0000000000012743

3. Kim HK, Park CJ, Jang S, et al: Bone marrow involvement of Langerhans cell histiocytosis: immunohistochemical evaluation of bone marrow for CD1a, Langerin, and S100 expression. Histopathology. 2014;65(6):742-748. doi:10.1111/his.12481

Day(s) Performed

Monday through Friday

Report Available

1 to 3 days

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information

88342-TC, primary

88341-TC, if additional IHC

LOINC Code Information

Test ID Test Order Name Order LOINC Value
CD1A CD1a IHC, Tech Only Order only;no result


Result ID Test Result Name Result LOINC Value
70691 CD1a IHC, Tech Only Bill only; no result


If not ordering electronically, complete, print, and send a Immunohistochemical (IHC)/In Situ Hybridization (ISH) Stains Request (T763) with the specimen.

Testing Algorithm

For the initial technical component only immunohistochemical (IHC) stain performed, the appropriate bill-only test ID will be reflexed and charged (IHTOI). For each additional technical component only IHC stain performed, an additional bill-only test ID will be reflexed and charged (IHTOA).

Mayo Clinic Laboratories | IHC Catalog Additional Information: