Figure 4From: Normal values of exhaled carbon monoxide in healthy subjects: comparison between two methods of assessment Readings and latencies of PiCO + Smokerlyzer challenged with CO standard (9.9 ppm) at different flow rates. Latency corresponded to the time elapsed from the beginning of expiration to the appearance of stable readings. Flows were assumed to be proportional to the pressures applied to the circuit because a linear flow could be reasonably hypothesized.Back to article page