The Nijmegen modification of the Bethesda assay for factor VIII: C inhibitors: improved specificity and reliability
B Verbruggen, I Novakova, H Wessels… - Thrombosis and …, 1995 - thieme-connect.com
B Verbruggen, I Novakova, H Wessels, J Boezeman, M van den Berg, E Mauser-Bunschoten
Thrombosis and haemostasis, 1995•thieme-connect.comAntibodies against factor VIII coagulant activity can appear in haemophiliacs who are treated
with factor VIII preparations but also spontaneously in non-haemophiliacs. The Bethesda
assay is the most commonly used method to detect these antibodies, but it lacks specificity
especially in the lower range resulting in unreliable data. Two modifications are proposed
and tested to resolve the imperfections: 1. Buffering the normal plasma used in the assay-
and control mixture with 0.1 M imidazole to pH 7.4. Replacing the imidazole buffer in the …
with factor VIII preparations but also spontaneously in non-haemophiliacs. The Bethesda
assay is the most commonly used method to detect these antibodies, but it lacks specificity
especially in the lower range resulting in unreliable data. Two modifications are proposed
and tested to resolve the imperfections: 1. Buffering the normal plasma used in the assay-
and control mixture with 0.1 M imidazole to pH 7.4. Replacing the imidazole buffer in the …
Antibodies against factor VIII coagulant activity can appear in haemophiliacs who are treated with factor VIII preparations but also spontaneously in non-haemophiliacs. The Bethesda assay is the most commonly used method to detect these antibodies, but it lacks specificity especially in the lower range resulting in unreliable data.
Two modifications are proposed and tested to resolve the imperfections:
1. Buffering the normal plasma used in the assay- and control mixture with 0.1 M imidazole to pH 7.4.
Replacing the imidazole buffer in the control mixture by immunodepleted factor VIII deficient plasma.
These modifications allow better discrimination between positive and negative samples and improve reliability.
Thieme Connect