A metering capillary and method for providing at least one defined volume of a target constituent of a sample is provided, the method comprising providing at least one metering capillary having at least two openings; at least partly filling the metering capillary with the sample; carrying out a constituent separation for the at least partial separation of at least two constituents of the sample inside the metering capillary; and dividing the metering capillary into at least two partial pieces, wherein at least one of the partial pieces contains the defined volume of the target constituent.