CD4 and coronary artery disorder: Average error from the reference standard in naïve CD4+ was 7.03 ± 0.59% in healthy adults; 8.20 ± 3.30% for subjects with CHD and no surgery; 11.9 ± 4.31% for subjects with CHD and prior surgery (2 with High TREC and 1 with LOW TREC).