Final answer:
The prone position is recommended for postural drainage of bilateral lung segments in an adult. It aids in gravity-assisted drainage of mucus from the lung's airways. Other positions are used for different segments or patient tolerances.
Step-by-step explanation:
The recommended position for postural drainage of bilateral lung segments in an adult is prone. This position facilitates the drainage of secretions from both the left and right sides of the lung segments. It is important for the individual to be positioned correctly to ensure the gravity-assisted drainage of mucus from the airways, which can then be more easily coughed up or suctioned away.
Postural drainage positions can vary based on the specific segments of the lung that require drainage. For example, the Trendelenburg position might be used for the lower lobes, and the Fowler's position might be useful for the upper lobes or for patients who have difficulty tolerating other positions. However, for bilateral lung segments, prone is generally recommended.