Autokit 3-Hb R1 Set^ Autokit 3-Hb R1 Set, Contents: Thio-NAD 2 x for 27 mL, Buffer 2 x 27 mL, Storage: 2-10 deg C, is an in vitro assay for the quantitative determination of 3-hydroxybutyrate (3-HB) in serum or plasma. High sensitivity and high specificity by utilizing cyclic enzymatic reactions