The inventors produced substances that neutralize the activity of a bispecific antibody having an activity of functionally substituting for FVIII, and undertook the construction of methods for measuring the reactivity of FVIII that can ensure accuracy even in the presence of this bispecific antibody. As a result, the inventors discovered that in APTT-based one-stage clotting assay, FVIII activity in the plasma of a hemophilia A patient can be evaluated accurately, and also that in APTT-based Bethesda assay, FVIII inhibitor titer in the plasma of a hemophilia A patient carrying a FVIII inhibitor can be evaluated accurately.

Provided herein are compositions and methods for quantifying polyphosphates. In particular, provided herein are solution and substrate based assays for quantifying polyphosphates in complex samples.

The present invention relates to a universal calibration method of use for assaying inhibitors of the same enzyme, for example for assaying inhibitors of an enzyme of blood coagulation. The invention also relates to the use of this universal calibration in a method for assaying a reversible or irreversible inhibitor of the enzyme in a biological sample. The invention also relates to the use of the universal calibration in a method for screening inhibitors of the enzyme.

The present invention relates to a method for detecting at least one direct factor Xa inhibitor in a sample other than citrate plasma, comprising the step of mixing a sample containing a factor Xa inhibitor with a composition containing factor Xa under conditions which allow the factor Xa to release a detectable substance from a chromogenic substrate.

The present disclosure relates to compositions and methods useful for assessing the efficacy in a patient having suffered from intracranial hemorrhage while undergoing an anticoagulation treatment with a factor Xa (fXa) inhibitor. The method can include administering to the patient a fXa derivative that has reduced catalytic activity as compared to the wild-type fXa protein, is capable of binding to the factor Xa inhibitor and cannot assemble into a prothrombinase complex; obtaining a blood sample from the patient following the administration; and measuring an anti-fXa activity in the sample, wherein the anti-fXa activity reflects the hemostatic efficacy in the patient. Once the assessment is made, suitable medical interventions can be implemented.

An example method includes the following operations: obtaining a dotting parameter based on a mixture including a test sample and a reagent, where the reagent includes a polycation; using the dotting parameter to identify at least one of a potential presence of a direct oral factor Xa inhibitor in the test sample or an estimated concentration of the direct oral factor Xa inhibitor in the test sample; and reporting a result that is based on the potential presence or the estimated concentration,

Disclosed is an in vitro method for detecting, in a biological sample, the presence of a blood coagulation enzyme inhibitor selected, independently, from factor Xa and factor IIa, the method including the step of making one or more competitive kinetics measurement(s) by carrying out a competitive enzymatic assay and implementing one or more types of classification or regression decision models obtained by training automated supervised learning models. The method may include the identification in the biological sample of an inhibitor in question, or even its characterization, or even its quantification. Also disclosed is a data processing system or device including implementation for at least part of the method, a computer program or storage medium which can be read by a computer or appropriate data, and a suitable kit.

The invention provides peptides that bind Tissue Factor Pathway Inhibitor (TFPI), including TFPI-inhibitory peptides, and compositions thereof. The peptides may be used to inhibit a TFPI, enhance thrombin formation in a clotting factor-deficient subject, increase blood clot formation in a subject, treat a blood coagulation disorder in a subject, purify TFPI, an identify a TFPI-binding compound.

The invention relates to a method of determining the bleeding risk of a subject comprising: a. contacting a first sample from the subject with an activation mixture comprising (I) TIX-5, (II) factor Xa or an activation agent for activating directly or indirectly the conversion of factor X to factor Xa, and (III) a phospholipid mixture, b. determining the value of a coagulation function parameter of said sample, c. comparing the coagulation function parameter with a control value, d. determining the bleeding risk based on a comparison between the value of said coagulation function parameter of said first sample and said control value.

Provided are methods and devices for evaluating coagulation, including the identification of a coagulation impairment such as a factor deficiency or the presence of a factor inhibitor. In various embodiments, the methods and devices measure coagulation of a sample in response to the addition of one or more coagulation factors, added at various concentrations to portions of the sample. Such coagulation measurements can be evaluated to accurately profile coagulation impairments of the sample. In additional various embodiments, point-of-care or bedside testing with a convenient, microfluidic device can be used by minimally trained personnel.