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- PA/lateral projection is the standard used for most patients who are ambulatory and able to stand.
- AP projection is obtained with the patient in bed and lying flat or partly upright. It is usually reserved for nonambulatory patients.
- AP projections have the disadvantage of making the heart an mediastinum appear more prominent as well as usually resulting in shallower inspiration which can limit evaluation of the lung bases.
- Always order a PA/lateral CXR over a AP CXR when possible.