Procedure for the provision of at least one defined volume of a target component (164) of a sample (134), comprising the following steps: - providing at least one dosing capillary (110) with at least two openings (112, 114) , the openings (112, 114) being arranged at the ends of the dosing capillary (110), in which at least one of the openings (112, 114), in particular a distal opening (116), has a constriction (120), the constriction (120) being arranged directly in the opening (112, 114), the constriction (120) comprising at least one circumferential edge, which protrudes inwardly, from the dosing capillary (110), the constriction (120) of such being designed such that an inner diameter of the dosing capillary (110) is narrowed by the constriction (120) in the constriction zone (120) to a value of 10% to 80% of the inner diameter in the area outside the constriction (120) , in which the dosing capillary (1 10) also between the openings (112, 114) it has at least one separation line (122) with at least one theoretical break point (124)； - at least partially fill the dosing capillary (110) with the sample (134)； - carrying out a separation of components for the at least partial separation of at least two components (150, 154) of the sample (134) within the dosing capillary (110)； and - dividing the dosing capillary (110) into at least two partial pieces (160, 162), at least one of the partial pieces (160) containing the defined volume of the target component (164).Procedimiento para la provisión de al menos un volumen definido de un componente objetivo (164) de una muestra (134), que comprende las siguientes etapas: - proporcionar al menos un capilar dosificador (110) con al menos dos aberturas (112, 114), estando dispuestas las aberturas (112, 114) en extremos del capilar dosificador (110), en el que al menos una de las aberturas (112, 114), en particular una abertura distal (116), presenta una constricción (120), estando dispuesta la constricción (120) directament
