Speaking roughly, normal levels of thyroid-stimulating hormone (TSH) are in the range of 0.4 to 4.0 mIU/L. However, each laboratory and test manufacturer identifies its own normal TSH range.
This pressure is typically set slightly higher than atmospheric pressure to prevent atelectasis, decrease inspiratory work of breathing, or improve gas exchange depending on the clinical scenario. This positive end-expiratory pressure (PEEP) is generated by a resistor in the exhalation port of the ventilator (Fig. 2).
As a summary, CPAP stands for continuous positive airway pressure. These machines blow a constant level of positive air pressure through a mask into your nose (or nose and mouth). Bilevel PAP refers to a machine that delivers two different levels, where a higher pressure is used during inhalation and a much lower pressure is given during exhalation.