Tests such as CT scans and ultrasounds add to hospital bills, but doctors said that such tests given right after patients showed up in emergency rooms only helped with diagnosis in roughly one of three cases, the study — published in the Archives of Internal Medicine — said. There is also research showing that the radiation from multiple CT scans might increase the risk of cancer over the long term.
To see whether such scans were really helpful, researchers led by Ami Schattner of Kaplan Medical Center in Rehovot, Israel, followed all the patients who showed up at the emergency room of a teaching hospital and were subsequently admitted.
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“Basic clinical skills remain a powerful tool, sufficient for achieving an accurate diagnosis in most cases,” Schattner and his colleagues wrote. “Physicians may count more on their clinical faculties when making decisions about patients.”
Over about two months, Schattner and his colleagues observed 442 consecutive patients. Each was separately examined by two doctors, a resident and a senior physician, who also asked patients about past health problems. Both doctors had access to results from all routine tests, including blood and urine analysis, and any extra scans that had been done when the patient first got to the emergency room.
The researchers later looked at how accurate the clinicians were in their decisions, compared to the final diagnoses patients were given during or after their hospitalization. They also asked the doctors what factors they relied on most when diagnosing each patient.