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).
Installed height is determined by how much the spring is compressed to arrive at proper seat pressure. Open pressure is the pressure exerted on the valve when it is in the open position, while seat pressure, the most critical, is the amount of pressure exerted on the valve while it is on the seat.