Patent ID: 7797980

Claim:
A method for calibrating machines to effect an analysis of a blood sample by measuring erythrocyte sedimentation rate (ESR) and/or aggregation of red corpuscles, wherein measurement is performed by exploiting optical density kinetics obtained from measurement of variation in optical density of said blood sample in an interval of time, comprising a measuring step in which, the same machine with which the measurement of the optical density is performed on said blood sample, wherein a first measurement is performed of the optical density of a first of at least two latexes, or turbidimetric samples, having a known optical density that is reproducible and measurable, and wherein a second measurement is performed of the optical density of a second of said at least two latexes having a known optical density that is reproducible, measurable and different from the optical density of said first latex, and a calibration step, in which the difference is calculated between the values of optical density of at least said first and second of said at least two latexes as obtained from the measurements performed by the machine and the known values of optical density, to determine at least one correction factor usable to calibrate said machine.