• Immunohistochemistry (IHC)
Factor VIII-related antigen is a component of Factor VIII complex. Factor VIII-related antigen is one of the available immunohistochemical markers of endothelial cells. It has also been demonstrated in platelets and megakaryocytes. IHC staining of Factor VIII-related antigen is useful for diagnosis of vascular neoplasms and for identification of vascular invasion by neoplasms.
Turnaround time
1 Day

Level of Service

  • Technical Only
New York Approved: Yes

Specimen Requirements

Paraffin Block: 1 Block sent with a cold pack. No zinc or mercury fixatives. H&E: 1 unstained slide cut at 4-5 microns required. Cut Slides: 2 to 3 unstained slides cut at 4-5 microns. 1 slide per antibody/probe ordered. >100 viable tumor cells per probe set. Positively charged slides in 10% NBF. No zinc or mercury fixatives.

Storage and Transportation

Storage & Transportation: Use cold pack for transport, making sure cold pack is not in direct contact with specimen. NYS clients please provide date and time of Collection.

CPT Code(s)*

88342 x 1 or 88341 x 1

*The CPT codes provided with our test descriptions are based on AMA guidelines and are for informational purposes only. Correct CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed.

Last Updated: January 17, 2025

Get in touch

Our Client Services team is on hand to help. Please call us at 866.776.5907, Option 3.