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Test ID: IH Factor 13
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Factor XIIIa
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Immunohistochemistry Stain
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Useful For
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Has been used with CD34 to differentiate between dermatofibroma and dermatofibrosarcoma protuberans.
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Method name and description
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- Mouse monoclonal Factor XIIIa Clone E980.1
- Immunoperoxidase stain on formalin-fixed, paraffin-embedded (FFPE) tissue section
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Clinical information
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This is a monoclonal antibody to the A-subunit of human coagulation Factor XIII. It recognizes human Factor XIII A-chain in both reduced and non-reduced forms. It does not react with human Factor XIII B-chain or human Factor XII. Factor XIII is a beta globulin found in plasma and is composed of two subunits. Factor XIII-A is the catalytic subunit and is a dimer of M.W. 160,000. Factor XIII is present in plasma as an alpha2beta2 heterodimer (M.W. 320,000); whereas in platelets, only the alpha2 unit exists. Factor XIIIa is a dermal dendrocyte marker and shows variable reaction with these types of tumors.
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Specimen type / Specimen volume / Specimen container
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- Specimen type: Well-fixed tissue in 10% neutral buffered formalin.
- Submit 2 unstained (3-4 µm thick) paraffin embedded tissue section mounted on a clean positively charged glass slide (sections to be cut within 6 weeks.) or formalin-fixed, paraffin-embedded (FFPE) tissue block.
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Storage and transport instructions
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- Slides or blocks are stored in cork box at room temperature away from sun light and any source of heat.
- Follow your local regulation shipping guidelines.
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Specimen Rejection Criteria
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- Broken slides
- Unlabeled slides with patient/case identification
- Contaminated slides
- Slides/paraffin blocks mismatch
- Uncharged slides
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Factors affecting test performance and result interpretation
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- Fixation time (FT)
- Fixative Type
- Storage time in paraffin
- Storage temperature
- Age of the cut sections
- Section thickness
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Turnaround time / Days and times test performed / Specimen retention time
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- Turnaround time for the test in platform: 3-4 hours
- Days and times test performed: Twice daily (Sunday to Wednesday)
- First batch: 0600H-1400H
- Second batch; 1230H - overnight
- Thursday (one batch only): 0600H-1400H
- Note: Request received after 1230H will be stained the following working day.
- Shelf-life of the paraffin section slides: ≤6 weeks
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