Serum preparation
This invention relates to the use of clotting compositions containing prothrombin activators to produce high quality blood serum samples for pathology and other biological assays, and to containers containing such clotting compositions, and related methods of use.
1. A serum preparation container, the container comprising a puncturable septum or cap and being evacuated for drawing blood from a subject into the container, and containing an amount of a surfactant and an amount of a blood clotting composition for preparing a serum sample suitable for detecting an analyte, wherein the blood clotting composition consists essentially of a recombinantly-produced snake venom prothrombin activator, wherein the snake venom prothrombin activator is functional to activate prothrombin without a mammalian factor Xa polypeptide.
2. A method of preparing a serum sample for detecting an analyte of interest, the method comprising collecting a blood sample in a blood collection container, said blood collection container comprising a puncturable septum or cap and being evacuated for drawing blood from a subject into the container, and containing an amount of a surfactant and an amount of a blood clotting composition for preparing a serum sample suitable for detecting an analyte, wherein the blood clotting composition consists essentially of a recombinantly-produced snake venom prothrombin activator that is functional to activate prothrombin without a mammalian factor Xa polypeptide, contacting the blood sample with the blood clotting composition in the container for a time and under conditions sufficient to prepare the serum sample.
3. A method of detecting an analyte of interest, the method comprising providing a serum sample prepared by a serum preparation method and analysing the serum sample for the presence or amount of the analyte of interest, wherein the serum preparation method comprises collecting a blood sample in a blood collection container, said blood collection container comprising a puncturable septum or cap and being evacuated for drawing blood from a subject into the container, and containing an amount of a surfactant and an amount of a blood clotting composition for preparing a serum sample suitable for detecting an analyte, wherein the blood clotting composition consists essentially of a recombinantly-produced purified snake venom prothrombin activator that is functional to activate prothrombin without a mammalian factor Xa polypeptide, contacting the blood sample with the blood clotting composition in the container for a time and under conditions sufficient to prepare the serum sample.
4. The serum preparation container according to claim 1 , wherein the snake venom prothrombin activator is a group A prothrombin activator.
5. The serum preparation container according to claim 4 , wherein the snake venom prothrombin activator is selected from ecarin and basparin.
6. The serum preparation container according to claim 1 , wherein the snake venom prothrombin activator is a group B prothrombin activator.
7. The serum preparation container according to claim 6 , wherein the snake venom prothrombin activator is selected from carinactivase-1, carinactivase-2 and multactivase.
8. The serum preparation container according to claim 1 , wherein the snake venom prothrombin activator is a group C prothrombin activator.
9. The serum preparation container according to claim 8 , wherein the snake venom prothrombin activator is selected from pseutarin C, oscutarin C and Omicarin C.
10. The serum preparation container according to claim 1 , wherein the snake venom prothrombin activator is a group D prothrombin activator.
11. The serum preparation container according to claim 10 , wherein the snake venom prothrombin activator is selected from porpharin D, notecarin D, trocarin D, hopsarin D and notenarin D.