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).
Using the latest technology in Noninvasive Ventilatory Support for home use, the BiPAP AVAPS device guarantees a certain volume of air per minute using the Average Volume Assured Pressure Support (AVAPS) technology exclusive to Respironics.