More On Anti-Xa DOAC Variability

Click our 7-23-25 entry, Anti-Xa DOAC Variability for an 8-21-25 reference from Dr. Emmanuel Favaloro.

Aug 16 2025

July 2025 CAP Today: A Deep Dive Into Key Hemostasis Testing Variables

Click A Deep Dive Into Key Hemostasis Testing Variables for an in-depth review of preanalytical hemostasis specimen concerns. The CAP article features Andrew Goodwin MD, professor, Department of Pathology and Laboratory Medicine, University of Vermont Larner College of Medicine, and medical director of the thrombosis and hemostasis section, University of Vermont Medical Center; and Dr. […]

Specimen Management

Hemophilia After 2014

I (Geo) just added an updated ~40-minute audio PowerPoint module that describes hemophilia therapy after 2014, including extended half-life concentrates, factor bypassing therapy, genetic transfer of F8 and F9 genes, and rebalancing therapy. The module ends with a discussion of the laboratory means for monitoring the new therapeutics. Navigate to Educational Modules and click Hemophilia […]

Bleeding Disorders

World Thrombosis Day 2025

It’s time to be thinking about World Thrombosis Day. From the WTD site, “World Thrombosis Day, founded by the International Society on Thrombosis and Haemostasis (ISTH), is a global initiative held annually on October 13. Our mission is to raise awareness about thrombosis, a condition often underestimated and misunderstood. Your participation can help inspire positive […]

Thrombophilia

Thrombotic Thrombocytopenic Purpura

Click “In Their Blood” for a review article about TTP from the University of Kansas (KU) Medical Center’s Pathology Department. The article highlights the early research into ADAMTS13‘s role in VWF metabolism, the early successes of PLEX therapy, and the current availability of the therapeutics caplacizumab and the ADAMTS13 concentrate, Adzynma. Also featured is the […]

Bleeding Disorders

August 2025 Cheat Sheet

Click here to see your August 2025 Fritsma Factor Cheat Sheet 8-1-25. If you would like your Cheat Sheet copy to arrive by email, please join the list using the invitation on the right. The Cheat Sheets, as well as all Fritsma Factor entries, are free, thanks to Precision BioLogic’s faithful sponsorship.

Cheat Sheets

August 2025 QQ: Anticoagulant Choice for AFIB

Our August 2025 Quick Question asks, “What AC does your provider prescribe for non-valvular AFIB?” I (Geo) asked my PCP this question at my annual wellness visit on July 29, 2025. Not a personal concern, just curious. Please provide your answer on the right and add your comments, which will appear in our end-of-month summary.

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Quick Question Archive

Jul 29 2025

george

July 2025 QQ: Hemophilia Rebalancing Therapy

Our July 2025 Quick Question asked, “Which is a hemophilia ‘rebalancing’ therapeutic?” The question attracted a modest 22 participants, perhaps an indication that rebalancing therapy was only FDA-approved in 2025 and awaits approval in Canada and Europe. Here are your responses… Valoctocogene roxaparvovec-rvox (ROCTAVIAN) 3 (14%) Efanesoctocog alfa (ALTUVIIIO) 1 (4%) Emicizumab (HemLibra) 7 (32%) […]

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Quick Question Archive

Jul 26 2025

george

Status of Gene-based Hemophilia A and B Therapy

Click here for an open-access, in-depth, illustrated review of the worldwide status of gene-based HA and HB therapy: Glasner MF, Pipe S, Miesbach W. Gene-based therapies for hemophilia. Res Pract Thromb Haemost. 2025;9:102870. doi: 10.1016/j.rpth.2025.102870. PMID: 40488175; PMCID: PMC12143782.

Bleeding Disorders

Anti-Xa DOAC Assay Variability

Click here to read an open-access article describing the variability in assay methodology when monitoring apixaban and rivaroxaban: Baker RM, Selby R, Moffat KA, et al. Investigating interassay variability between direct oral anticoagulant calibrated anti-factor Xa assays: a substudy of the perioperative anticoagulation use for surgery evaluation (PAUSE) trial. Res Pract Thromb Haemost. 2025;9:102899. doi: 10.1016/j.rpth.2025.102899. […]

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Anticoagulant Therapy

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More On Anti-Xa DOAC Variability

July 2025 CAP Today: A Deep Dive Into Key Hemostasis Testing Variables

Hemophilia After 2014

World Thrombosis Day 2025

Thrombotic Thrombocytopenic Purpura

August 2025 Cheat Sheet

August 2025 QQ: Anticoagulant Choice for AFIB

July 2025 QQ: Hemophilia Rebalancing Therapy

Status of Gene-based Hemophilia A and B Therapy

Anti-Xa DOAC Assay Variability

George Fritsma MS MLS

Cheat Sheets from George

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