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).
Quick View. A Bilevel Positive Airway Pressure (BiPAP) machine is like a CPAP in that it also uses room air delivered through a mask system to keep the airway open of the person using the machine. The difference being that a BiPAP uses two different preset pressures for increased tolerance of PAP treatment.