Final answer:
An abdominal X-ray is typically the first and best test for suspect bowel obstruction, providing quick and non-invasive evidence. CT scans and other tests follow for detailed assessment.
Step-by-step explanation:
The first best test for suspect bowel obstruction is generally an abdominal X-ray. This non-invasive test can provide evidence of bowel obstruction by showing dilated bowel loops or air-fluid levels. While other tests such as CT scans provide more detailed images and can help with further assessment and management, an abdominal X-ray is often the initial step due to its availability and speed in an emergency setting. Tests like colonoscopy or endoscopy may be inappropriate as initial tests for bowel obstruction due to their invasive nature and the potential risk of perforation in the presence of an obstruction.