Testing that actually
tells you why.
Our diagnostic process connects your symptoms directly to the right tests, in the right order, with a clear plan.
Dedicated diagnostic hub
One specialist. One focus. Every test interpreted in full context.
Connects symptoms to tests
No guesswork — the right diagnostic for your specific symptom.
Pre-surgery planning
Every procedure starts with the right diagnostic baseline.
Post-surgery success checks
We verify outcomes after surgery — not just assume them.
EndoFLIP
Most surgeons estimate how the esophagus is functioning based on other tests. Dr. Dunn measures it — precisely — using EndoFLIP (Endoluminal Functional Lumen Imaging Probe) technology.
EndoFLIP creates a real-time pressure and geometry map of the esophagus. This means Dr. Dunn knows exactly what's happening structurally before surgery, can calibrate the procedure to the right degree, and can confirm success immediately after.
The result: fewer revisions, better outcomes, and a clear answer on whether surgery worked.
Eight additional tests.
Each one explained.
Dr. Dunn orders only what's needed — and explains every result in plain English, not medical jargon.
Gastric Emptying Study
A gastric emptying study measures how quickly food leaves the stomach. Learn how Dr. Colin Dunn uses these results to evaluate gastroparesis, chronic nausea, and complex foregut symptoms in Los Gatos.
CT Abdomen & Pelvis
Learn how a CT abdomen and pelvis scan helps evaluate abdominal pain, diverticulitis, and hernias to support surgical planning with Dr. Colin Dunn.
Reflux Testing (pH Study)
Reflux testing measures acid and non-acid reflux activity over time to help evaluate GERD and other conditions. Learn how Dr. Colin Dunn uses pH impedance and wireless Bravo monitoring in Los Gatos.
Esophageal Manometry
Esophageal manometry measures pressure and muscle coordination in the esophagus to help evaluate swallowing disorders, achalasia, and reflux surgery planning.
Barium Swallow / Esophagram
An esophagram is a moving X-ray test that helps doctors watch your swallowing in real time to find structural problems in your esophagus.
Upper Endoscopy (EGD)
Learn how an upper endoscopy (EGD) helps Dr. Colin Dunn evaluate reflux, swallowing problems, and stomach pain in Los Gatos and Silicon Valley.
Gallbladder Ultrasound
Gallbladder ultrasound is a safe imaging test for gallstones and abdominal pain. Learn how Dr. Colin Dunn uses these results for gallbladder care in Los Gatos.
HIDA Scan
A HIDA scan evaluates bile flow and gallbladder function when gallbladder symptoms persist or ultrasound is unclear. Learn how Dr. Colin Dunn uses HIDA results in Los Gatos for gallbladder evaluations.
Testing with a purpose not just a protocol.
Every test Dr. Dunn orders has a reason. Here's how diagnostics fit into the overall care pathway.
Before ordering any test, Dr. Dunn explains exactly what it's looking for, why it matters for your specific symptoms, and what the result will mean for your treatment options.
Before any procedure, Dr. Dunn uses a combination of diagnostics to confirm the diagnosis, understand the anatomy, and plan the exact approach. Surgery at NorCal Integrity Surgery is never a guess.
After surgery, Dr. Dunn doesn't just assume the procedure worked — he verifies it. Follow-up diagnostics confirm resolution of the original problem and catch any issues early before they become problems.