Tables O.1 to O.3 provide information about the priority order for analysis of blood analytes in Year 9 of the NDNS RP. Blood analyte priorities are shown for participants aged 1.5 to 6 years, 7 to 15 years and 16 years and over. For each age group, analytes are shown firstly, by the order in which the blood tubes were collected from the participant and, secondly, by the order in which the analyses were performed within each tube. The priority order for analysis of blood analytes in Years 5 to 8 are presented in appendix O of the NDNS Years 5 and 6 (combined)1 and Years 7 and 8 (combined)2 reports respectively.