1. Barium swallow
2. Esophageal manometry
3. Ambulatory pH monitoring
4. All of the above

Answer 4 is correct.

Objective: To be familiar with the preoperative evaluation for a laparoscopic Nissen fundoplication procedure

All candidates for a laparoscopic Nissen fundoplication should undergo a preoperative evaluation that includes symptomatic evaluation, barium swallow, endoscopy, esophageal manometry, and ambulatory pH monitoring. Ambulatory pH monitoring is the most reliable test for the diagnosis of GERD; it has a sensitivity and specificity of about 92%.