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Bleeding Disorders

Dec 1 2025
george

November 2025 QQ Summary: Historic Coag Factor Nomenclature

Our November Quick Question summary about Stuart-Prower Factor, linked to a 2023 article by Dave McGlasson about coagulation factor nomenclature. The summary and McGlasson’s article attracted a comment from Dr. Emmanuel Favaloro, which described the nomenclature of traditional and current VWF activity assays.  Dr. Favaloro cited three open-access articles on this topic (click to obtain the […]
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Blog
Nov 19 2025
george

An Illustrated Review of Hemophilia B.

Click here for the illustrated open-access review, Hermans C, Astermark J, Trakymienė SŠ, Jiménez-Yuste, V. Haemophilia B: an illustrative review of current challenges and opportunities.  Res Prac Thromb Haemostasis, 2025;9, 103229. Abstract Background Hemophilia B is a genetic bleeding disorder caused by a deficiency of clotting factor IX, which presents unique challenges in clinical management. […]
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Bleeding Disorders
Nov 19 2025
george

VWF Factor Assays in Caplacizumab Therapy

Check with your medical library or join ISTH to obtain Colpani P, Baronciani L, Mancini I, et al. Evaluation of different platelet-dependent von Willebrand factor activity assays to assess the in vivo inhibitory effect of caplacizumab on the von Willebrand factor-platelet interaction. J Thromb Haemost. 2025:S1538-7836(25)00545-8. doi: 10.1016/j.jtha.2025.08.020. PMID: 40915571. Abstract Background: Caplacizumab, a humanized […]
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Bleeding Disorders
Nov 17 2025
george

A Case Study: Congenital Hypofibrinogenemia

Check your medical library for Wu Y, Qin K, Xiang L, et al. Congenital hypofibrinogenemia with bleeding risk: mutations in the FGA, FGB, and FGG genes. Lab Med. 2025:lmaf042. doi: 10.1093/labmed/lmaf042. PMID: 41233956. Abstract Introduction: Congenital hypofibrinogenemia is a genetic disorder caused by defects in the fibrinogen gene. We identified a case of congenital hypofibrinogenemia […]
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Bleeding Disorders
Oct 29 2025
george

Gene Transfer Therapy Updates

Yesterday, 10-28-25, we reported BioMarin’s press release announcing divestiture of their hemophilia A gene transfer therapy, valoctocogene roxaparvovec (Roctavian®). Previously, on February 25, 2025, Pfizer announced their intention to discontinue hemophilia B gene transfer therapy, fidanacogene elaparvovec-dzkt (Becvez®). Press releases from both indicate underperformance in sales. The remaining hemophilia B therapy, etranacogene dezaparvovec-drlb (HEMGENIX®), CSL […]
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Bleeding Disorders
Oct 25 2025
george

Precision BioLogic Webinar: Advancing Hemophilia A Testing with a Bovine Chromogenic FVIII Assay

Listen as Precision BioLogic’s Chief Scientific Officer F. Jon Geske, PhD and Marketing Director Ian Burns chair the webinar, Advancing Hemophilia A Testing with a Bovine Chromogenic FVIII Assay. Joining them are… Tara Quinton, R&D Scientist and part of Precision BioLogic’s Chromogenic FVIII assay design team, discussing the assay’s expanded utility along with new data […]
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Bleeding Disorders
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George Fritsma MS MLS

George Fritsma is a medical laboratory scientist, educator, and author. George  is a member of the International Society on Thrombosis and Hemostasis, the International Society for Laboratory Hematology, and the American Society for Clinical Laboratory Science.

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Quick Question

What VWD therapeutic is NOT a replacement factor?