Standard forearm X‑ray series includes an anteroposterior (AP) view and a lateral view. The AP view is taken with the forearm supinated and extended to show radius and ulna parallel; the lateral is obtained with the elbow flexed 90° to demonstrate true lateral alignment and bone overlap. Images should include wrist and elbow joints. Oblique or additional views may be requested for fractures.

In an AP (anteroposterior) forearm projection the patient’s elbow is fully extended and the forearm is supinated so the palm faces upward. The humerus, forearm and wrist lie in the same horizontal plane with the radius and ulna parallel. Include both wrist and elbow joints; direct the central X‑ray beam perpendicular to the mid‑forearm to avoid bone overlap and distortion.

The AP forearm should visualize the entire forearm from wrist to elbow on one radiograph, including the full length of both radius and ulna, their distal and proximal articulations, and surrounding soft tissues. The elbow and wrist joints must be included for joint assessment. The forearm should be supinated with the palm facing up, elbow extended, and the limb aligned to avoid rotation and superimposition.

AP view X‑ray stands for Anteroposterior view. In this projection the X‑ray beam travels from the anterior (front) of the body to the posterior (back), producing an image with the detector behind the patient. AP views are commonly used when patients cannot stand for a PA (posteroanterior) film, such as supine or bedside radiographs, though magnification and cardiac silhouette changes can occur.

AP (anteroposterior) films are taken with X-rays entering anteriorly, often portable or supine; they magnify the heart, can widen the mediastinum, and show clavicles more horizontal with scapulae projected over lungs. PA (posteroanterior) films are taken standing with X-rays entering posteriorly; they reduce cardiac magnification, give truer heart/mediastinal size, and clear scapulae off the lung fields for better detail.

Most X‑ray exams use at least two views (orthogonal: AP/PA and lateral). Chest X‑rays are commonly two views (PA and lateral), though a single AP may be done for bedridden patients. Extremities usually require two orthogonal views; complex injuries often need a third (oblique or specialized projection). The number of views is guided by the clinical question and radiologist’s recommendation.