Description of blood Analysis:

Gastrin is a peptide hormone primarily produced by “G cells” in the antrum of the stomach and the duodenum. Its main role is to stimulate the parietal cells of the stomach to produce gastric acid (hydrochloric acid), which is essential for digestion. The secretion of gastrin is controlled by a feedback loop: as the stomach becomes more acidic, gastrin production normally decreases. This test measures the concentration of gastrin in the blood to identify disorders related to overproduction or regulatory failure.

What Does the Test Represent?

• Goal: To evaluate the production of gastrin and the functional relationship between the stomach and the pancreas.
• Main Application: Diagnosing Zollinger-Ellison syndrome (gastrin-secreting tumors), investigating chronic peptic ulcers, and identifying the cause of chronic diarrhea or atrophic gastritis.
• Method: Chemiluminescent immunoassay (CLIA) or Radioimmunoassay (RIA).

Collection Recommendations (General)

• Timing: The sample must be collected fasting, early in the morning.
• Hygiene: Standard venipuncture procedure.
• Material: Venous blood (serum).
• Specific Rules: The “(Ice)” designation indicates that the sample is highly temperature-sensitive. The blood must be drawn into a pre-chilled tube, immediately placed on ice, and transported to the laboratory in a frozen or chilled state to prevent the hormone from degrading.

What Can Affect the Results?

• Factors Altering Levels: Recent meals (especially protein-rich foods), alcohol consumption, and chronic kidney failure.
• Medications: The use of Proton Pump Inhibitors (PPIs) like omeprazole or H2-blockers significantly increases gastrin levels because they reduce stomach acid, causing the body to compensate by producing more gastrin. These medications should ideally be discontinued for 1–2 weeks prior to the test, under medical supervision.

When to Take the Test?

• Recommendations: If you have severe, recurring stomach ulcers that do not respond to standard treatment, chronic diarrhea with no clear cause, or a family history of Multiple Endocrine Neoplasia type 1 (MEN1).
• Preparation: Fasting for a full 12 hours is mandatory. Avoid alcohol for 24 hours before the test.

How to Interpret the Results? 

The interpretation of Gastrin levels is strictly a clinical analytical task for a physician. Very high gastrin levels (hypergastrinemia) in the presence of high stomach acid are characteristic of a gastrinoma. However, high gastrin levels can also occur if the stomach is not producing enough acid (as in atrophic gastritis). Only a specialist can “fine-tune” the diagnosis by performing a secretin stimulation test or measuring gastric pH alongside the gastrin level.

Possible Further Investigations

• Chromogranin A: A general tumor marker often elevated in neuroendocrine tumors like gastrinomas.
• Secretin Stimulation Test: Used to distinguish Zollinger-Ellison syndrome from other causes of high gastrin.
• Endoscopy: To visualize the stomach lining and check for ulcers or atrophy.
• Imaging (CT/MRI/Octreoscan): To locate potential tumors in the pancreas or duodenum.

When Does the Next Step Make Sense? 

If gastrin levels are persistently elevated, the next step involves determining if the cause is a manageable condition like gastritis or a more serious neuroendocrine tumor. Proper diagnosis is essential to prevent severe complications like gastrointestinal perforation or chronic malabsorption.

👉 If necessary, you can discuss the analysis results with a specialist such as a gastroenterologist (Doctors – TAMC) or endocrinologist (Doctors – TAMC).