Diagnostic assay for stroke
Heart and brain fatty acid binding proteins (H-FABP, B-FABP) are markers for stroke. The invention provides a diagnostic assay for either of these markers, preferably by ELISA using anti-H-FABP or B-FABP antibody. Since H-FABP is also a marker for acute myocardial infarction (AMI), to distinguish stroke from AMI requires an assay specific to AMI, e.g. using troponin-I or creatine kinase-MB as a marker, also to be carried out.
1. A diagnostic assay for stroke comprising
obtaining a body fluid sample from a subject;
measuring the sample from the subject for heart fatty acid binding protein and for a marker of acute myocardial infarction;
comparing the level of heart fatty acid binding protein and the level of the marker of acute myocardial infarction measured in the sample from the subject with the level of heart fatty acid binding protein and the level of the marker of acute myocardial infarction in a control sample obtained from subjects not suffering from stroke and acute myocardial infarction,
wherein elevated levels of heart fatty acid binding protein, in combination with non-elevated levels of the marker of acute myocardial infarction, in the sample from the subject compared with the control sample, indicates that the subject is suffering from a stroke.
2. The diagnostic assay according to claim 1 wherein the marker of acute myocardial infarction is selected from the group consisting of troponin-I and creatine kinase-MB.
3. The diagnostic assay for stroke according to claim 1 , wherein the sample is selected from the group consisting of blood, plasma and serum.
4. The diagnostic assay for stroke according to claim 1 , wherein an antibody specific for the heart fatty acid binding protein is used to detect heart fatty acid binding protein.
5. The diagnostic assay according to claim 4 wherein the antibody is used in an immunoassay.
6. The diagnostic assay according to claim 5 wherein the immunoassay is an enzyme-linked immunosorbent assay.
7. The diagnostic assay according to claim 4 wherein the antibody is a monoclonal antibody.