The prognostic value of an erect and supine abdominal X-ray was studied prospectively in 97 patients with an acute abdomen. Although 64 (66%) of the radiographs showed an abnormality, the surgical registrar attered his clinical diagnosis on only seven occasions and changed his management on four....
The investigation was of immediate clinical value in only 4% of the patients, and its use could probably be limited without detriment to patients.
Evaluation of the plain abdominal X-ray in the acute abdomen. Stower MJ, Amar SS, Mikulin T, Kean DM, Hardcastle JD.
J R Soc Med. 1985 Aug;7S(3):630-3.