Afstyla – One-stage clotting assay conversion factor

We have been receiving questions regarding Afstyla and whether WAPPS-Hemo already multiplies the resultant measurements by a factor of 2 if a one-stage clotting assay was used. Conversely, the scientific community recommends the use of chromogenic assays or to “calibrate” the clotting assays with a specific standard.

For data entry into WAPPS-Hemo, we do not specifically recommend to multiplying the results by 2, but we accept such converted values. We do not do the multiplication in the backend of WAPPS-Hemo.

For more information about this conversation, please click here. The link will take you to the CSL Behring website regarding instructions on the assay conversation.

For a link to the most updated full list of lab test assay recommendations, please click here.