The baseline clinical and demographic parameters are shown in Table 2. The pattern of FDG uptake in various lymph node groups of the body, percentage of patients with pulmonary parenchymal FDG positivity (sarcoidosis, 52.3%; TB, 44.8%), and patterns of FDG uptake in the lung parenchyma and by extrapulmonary organs (sarcoidosis, 40.9%; TB, 41.3%) were similar between the two study groups (Table 3). FDG uptake was most frequent in the lower paratracheal lymph node (station 4) (sarcoidosis, 98.9%; TB, 96.6%) and the subcarinal lymph node (station 7) (sarcoidosis, 94.3%; TB, 93.1%). Among the mediastinal nodal stations, FDG uptake in the paraaortic (63.6% vs 28.6%, P = .0001) and interlobar (83% vs 55.2%, P = .002) lymph nodes was more common in sarcoidosis. The median maximum standardized uptake value (SUVmax) (early), SUVmax (delayed), and retention index (RI) were 12.4, 16.2, and 32.3%, respectively, in the sarcoidosis group and 10.9, 14.4, and 33.8%, respectively, in the TB group. Patients with sarcoidosis more often had SUVmax (early) values > 15.0 (31 patients vs four patients, P = .026). An SUVmax (early) cutoff of 15.0 for identifying sarcoidosis has a specificity of 86.2% and positive predictive value of 88.6%. Thus, in a patient suspected of having either TB or sarcoidosis, a finding of SUVmax (early) > 15.0 increases the probability of it being sarcoidosis. However, this cutoff has poor sensitivity and negative predictive values of 35.6% and 30.9%, respectively.