Figure 2From: Nitric oxide production in the exhaled air of patients with pulmonary tuberculosis in relation to HIV co-infection Consecutive morning measurements of exhaled nitric oxide (FeNO). Correlation (r2 = 0.862) between two consecutive morning measurements of exhaled nitric oxide (FeNO) in blood donors and household contacts (n = 22). All measurements were performed between 8 am and 12 am. ppb (parts per billion).Back to article page