Table 2. Biospecimen repository: proportions of subjects with samples1

  UNC Pre-K LSU Post-K LSU ALL
Serum1 (10ml, no additive, no clot activator, uncoated interior). Proportion of subjects with 10 aliquots 0.92 0.85 0.92 0.92
Plasma (8.5ml tub-6ml draw ACD solution A). Proportion of subjects with 6 aliquots 0.89 0.94 0.90 0.90
Plasma (6.0ml K2 EDTA). Proportion of subjects with 6 aliquots 0.92 0.85 0.92 0.91
Packed RBCs. Proportion of subjects with 2 aliquots 0.92 0.85 0.92 0.91
Urine (with preservative) 0.98 0.86 0.98 0.97
Urine (without preservative) 0.98 0.86 0.98 0.97
Toenail Clippings 0.96 0.97 0.99 0.97
DENOMINATOR 1031 213 1014 2258

1There were 835 UNC subjects (395 AA, 440 CA) interviewed before May 1, 2007. Of these subjects, 772 (360 AA, 41 CA) contributed serum samples, which were transported at room temperature rather than on ice.