does stomach cancer show up in blood tests

Mariah Brown

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Mariah Brown

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Welcome to this comprehensive guide on stomach cancer and blood tests. Are you concerned about the possibility of having stomach cancer and wondering if it can be detected through blood tests? You’ve come to the right place. Throughout this article, we will explore the relationship between stomach cancer and blood tests, shedding light on the diagnostic process, available tests, and their efficacy. By the end, you will have a better understanding of how blood tests play a role in the detection of stomach cancer.

Before we delve into the details, let me introduce myself and explain why I am qualified to provide information on this topic. My name is [Your Name], and I am a medical professional with [X] years of experience in diagnosing and treating various medical conditions, including stomach cancer. My goal is to provide you with accurate, up-to-date information in an easy-to-understand manner so that you can make informed decisions about your health. Now, let’s explore the topic of stomach cancer and blood tests together, shall we?

does stomach cancer show up in blood tests

Understanding Stomach Cancer

Stomach cancer, also known as gastric cancer, develops in the lining of the stomach. It is a relatively rare type of cancer but can be life-threatening if not diagnosed and treated early. Stomach cancer often presents with non-specific symptoms, making it challenging to detect in its early stages. That’s why diagnostic tests, including blood tests, play a crucial role in identifying the presence of stomach cancer.

When it comes to detecting stomach cancer, blood tests alone are not sufficient for a definitive diagnosis. However, blood tests can provide valuable information that helps guide healthcare professionals in their diagnostic process. Let’s explore the different blood tests commonly used in the evaluation of stomach cancer.

Blood Tests for Stomach Cancer

1. Complete Blood Count (CBC): This test measures the number of red blood cells, white blood cells, and platelets in your blood. An abnormal CBC may suggest the presence of stomach cancer, although it is not specific to this condition.

2. Tumor Markers: Certain substances produced by cancer cells, known as tumor markers, can be detected in the blood. In the case of stomach cancer, two commonly measured tumor markers are carcinoembryonic antigen (CEA) and carbohydrate antigen 19-9 (CA 19-9). Elevated levels of these markers may indicate the possible presence of stomach cancer, but further diagnostic tests are necessary for confirmation.

3. Liver Function Tests: Stomach cancer can spread to the liver, affecting its function. Liver function tests measure various enzymes, proteins, and other substances in the blood to assess liver health. Abnormal liver function test results may indicate liver involvement due to stomach cancer.

While these blood tests can raise suspicion of stomach cancer, they are not conclusive. The information obtained from blood tests is typically used in combination with other diagnostic procedures for an accurate diagnosis. Let’s explore some of these procedures.

Diagnostic Procedures for Stomach Cancer

Upper Endoscopy

One of the most effective diagnostic procedures for stomach cancer is an upper endoscopy. During this procedure, a flexible tube with a camera at its tip is inserted through the mouth and esophagus to visualize the stomach lining. If any suspicious areas are identified, biopsies can be taken for further examination.


A biopsy involves the collection of tissue samples from the stomach for microscopic examination. These samples are obtained during an upper endoscopy using special instruments. Biopsies are an essential step in diagnosing stomach cancer as they help determine if cancer cells are present and provide information about the type and stage of the cancer.

Testing Biopsy Samples

Once the biopsy samples are obtained, they are sent to a laboratory for testing. Skilled pathologists examine the samples under a microscope to confirm the presence of cancer cells. Additionally, they can analyze the samples to determine the cancer’s specific characteristics and guide treatment decisions.

Imaging Tests for Evaluating Stomach Cancer

In addition to blood tests and diagnostic procedures, imaging tests play a crucial role in evaluating stomach cancer. These tests provide detailed information about the extent of the cancer, helping healthcare professionals plan the most appropriate treatment approach. Let’s explore some common imaging tests used for evaluating stomach cancer.

Stomach Cancer Imaging Tests

Upper Gastrointestinal (GI) Series

An upper GI series, also known as a barium swallow, involves drinking a liquid containing barium followed by X-rays. This test helps visualize the stomach and its surrounding structures, allowing healthcare professionals to identify any abnormalities or tumors.

Computed Tomography (CT or CAT) Scan

A CT scan uses a combination of X-rays and computer technology to create detailed cross-sectional images of the body. CT scans are often used to assess the size, location, and spread of the stomach cancer, as well as its impact on nearby organs and lymph nodes.

Endoscopic Ultrasound

Endoscopic ultrasound combines endoscopy with ultrasound technology to provide detailed images of the gastrointestinal tract and surrounding structures. This test allows healthcare professionals to evaluate the depth of tumor invasion and assess nearby lymph nodes for signs of cancer spread.

Positron Emission Tomography (PET) Scan

A PET scan involves the injection of a small amount of radioactive material into the body. This material is then detected by a scanner, producing images that reveal areas of high metabolic activity. PET scans help identify areas where stomach cancer may have spread, such as lymph nodes or other organs.

Magnetic Resonance Imaging (MRI)

An MRI uses a strong magnetic field and radio waves to create detailed images of the body’s internal structures. MRI is particularly useful in assessing the extent of stomach cancer and its nearby involvement with blood vessels.

Chest X-ray

A chest X-ray may be performed to check for the spread of stomach cancer to the lungs. This test helps evaluate the presence of any lung metastases or other lung abnormalities associated with stomach cancer.

Other Tests Used in Stomach Cancer Diagnosis


Laparoscopy is a surgical procedure that involves making small incisions in the abdomen and inserting a thin, flexible tube with a camera into the abdominal cavity. This procedure allows healthcare professionals to directly visualize the stomach and surrounding organs, making it useful in the staging and planning of treatment for stomach cancer.

Tests of Organ Function

In addition to liver function tests mentioned earlier, other tests may be performed to assess the function of other organs impacted by stomach cancer. These tests can include kidney function tests, blood clotting studies, and others as determined by the healthcare team.

Table: Overview of Diagnostic Tests for Stomach Cancer

Test Purpose
Complete Blood Count (CBC) To assess overall blood cell counts
Tumor Markers (CEA and CA 19-9) To measure certain substances associated with stomach cancer
Liver Function Tests To evaluate liver health and possible involvement of stomach cancer
Upper Endoscopy To visualize the stomach lining and obtain biopsy samples
Biopsy To collect tissue samples for microscopic examination
Imaging Tests (CT scan, MRI, PET scan, etc.) To assess the extent of stomach cancer and its impact on nearby organs
Laparoscopy To directly visualize the stomach and stage the cancer
Tests of Organ Function To assess the function of organs affected by stomach cancer

FAQs About Stomach Cancer and Blood Tests

Q: Can blood tests alone diagnose stomach cancer?

A: No, blood tests alone cannot diagnose stomach cancer. They can provide valuable information that guides the diagnostic process, but further tests are required for a definitive diagnosis.

Q: Do elevated tumor markers always indicate the presence of stomach cancer?

A: While elevated tumor markers like CEA and CA 19-9 may suggest stomach cancer, they are not specific to this condition. Other benign conditions and even certain medications can also cause elevated tumor marker levels. Further investigation is necessary for a conclusive diagnosis.

Q: What is the role of imaging tests in stomach cancer diagnosis?

A: Imaging tests, such as CT scans, MRIs, and PET scans, provide detailed information about the location, size, and spread of stomach cancer. They help guide treatment planning and decision-making.

Q: Are there any other diagnostic tests used for stomach cancer?

A: Yes, laparoscopy and tests of organ function are additional tests that can be performed to gather more information about the cancer and its impact on surrounding structures and organs.


In conclusion, while blood tests are not definitive in diagnosing stomach cancer, they play an essential role in guiding healthcare professionals toward further diagnostic procedures. Combining blood tests with upper endoscopy, biopsies, and imaging tests allows for a more accurate diagnosis of stomach cancer. If you have concerns about stomach cancer or blood tests, it is crucial to consult with a qualified healthcare professional who can thoroughly evaluate your individual case. Remember, early detection and treatment offer the best chances of successfully managing stomach cancer.

For more relevant and informative articles related to stomach cancer and various medical topics, feel free to explore the rest of our website. Your health is our priority, and we are here to provide you with reliable information.

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