A patient is for a series of diagnostic studies of the gastrointestinal system. Which of these studies should be scheduled to avoid altering the results of the remaining test?

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SGPGI Staff Nurse Official Paper (Held On: 28 Feb, 2024 Shift 1)

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Answer 1

Correct Answer: Barium enema

Rationale:

A barium enema is a diagnostic procedure used to visualize the large intestine (colon and rectum) using X-ray imaging. During this procedure, a liquid containing barium sulfate is introduced into the colon. Barium sulfate coats the lining of the intestine, enhancing its visibility on X-ray images.
The barium residue left in the gastrointestinal tract can interfere with the results of other diagnostic studies, such as ultrasounds, computed tomography (CT) scans, and colonoscopies. Therefore, it is essential to schedule the barium enema last in a series of gastrointestinal diagnostic tests to avoid altering the results of subsequent tests.
In cases where multiple gastrointestinal diagnostic studies are required, careful scheduling is critical to ensure accurate test results and avoid unnecessary repetition of procedures.

Explanation of Other Options:

Ultrasound

Rationale: Ultrasound imaging uses sound waves to produce images of internal organs. It is a non-invasive and safe procedure that does not require the introduction of substances like barium. Scheduling an ultrasound before a barium enema is recommended because the barium residue can obscure the ultrasound images.

Colonoscopy

Rationale: A colonoscopy involves inserting a flexible tube with a camera into the colon to examine its lining. This procedure requires a clear colon, which is usually achieved through bowel preparation. If a barium enema is performed beforehand, the barium residue can interfere with the visualization during colonoscopy.

Computed Tomography (CT)

Rationale: CT scans provide detailed cross-sectional images of internal structures using X-rays. The presence of barium residue from a prior barium enema can alter the CT images, leading to potential misinterpretation. Therefore, it is best to schedule the CT scan before the barium enema.

Additional Information:

The sequence of diagnostic tests is crucial for obtaining accurate results. Healthcare providers typically plan the order of procedures based on their potential to interfere with subsequent tests.
Patients should always inform their healthcare team about upcoming or recent diagnostic tests to ensure proper scheduling and avoid complications.
Following the recommended sequence of procedures helps minimize patient discomfort and reduces the need for repeated diagnostic studies.

Conclusion:

Among the given options, the barium enema should be scheduled last to prevent interference with the results of other diagnostic tests. Proper scheduling ensures the accuracy of all procedures and aids in effective diagnosis and treatment planning.