CALIBRATOR, ALINITY I ESTRADIOL KIT The Alinity i Estradiol Calibrators are for the calibration of the Alinity i analyzer when used for the quantitative determination of estradiol in human serum and plasma CAL A contains TRIS buffer with protein (bovine) stabilizers CAL B - F contain estradiol in TRIS buffer with protein (bovine) stabilizers WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.