Final answer:
The most appropriate initial diagnostic test for suspicion of small bowel obstruction is an abdominal X-ray. Additional tests such as CT scan or barium swallow may be required for further evaluation. Microscopic examination of stool can also be performed to look for signs of gastrointestinal issues.
Step-by-step explanation:
The most appropriate initial diagnostic test for suspicion of small bowel obstruction is an abdominal X-ray. This test can show evidence of obstruction, such as air-fluid levels and dilated loops of bowel. It is a non-invasive and readily available test that can provide helpful information to guide further management.
In some cases, additional tests such as a CT scan or barium swallow may be required for further evaluation and to confirm the diagnosis.
Microscopic examination of stool over several days can also be performed to look for any signs of gastrointestinal issues that may be causing the obstruction.