How Is Colorectal Cancer Diagnosed?

By Author: Dr Viraj Lavingia
Total Articles: 4
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If you're looking into colorectal cancer treatment in Ahmedabad, diagnosis is always the starting point. Here's a simple walkthrough of how doctors actually confirm it, step by step.
It Usually Starts With a Conversation
Before any test happens, your doctor will typically sit down and talk through your symptoms, family history, and general health. This step matters more than people realize.
They'll ask about changes in bowel habits, bleeding, weight loss, or fatigue.
They'll check if anyone in your family has had colorectal or related cancers.
They'll do a basic physical examination, which may include a simple rectal exam.
This conversation helps the doctor decide which tests make the most sense for your specific situation, rather than running everything at once.
Colonoscopy: The Most Important Test
If colorectal cancer is suspected, a colonoscopy is usually the next step, and honestly, it's the most reliable way to get real answers.
A thin, flexible tube with a camera is used to examine the entire inner lining of the colon and rectum.
It allows the doctor to directly ...
... see any unusual growths, called polyps, or areas that look abnormal.
If something suspicious is found, a small tissue sample called a biopsy is taken during the same procedure.
Most people worry about discomfort, but the procedure is done under sedation, so patients are usually asleep or deeply relaxed throughout.
Biopsy: Where the Real Confirmation Happens
A colonoscopy can show that something looks abnormal, but a biopsy is what actually confirms whether it's cancer.
The tissue sample is sent to a lab and examined under a microscope by a pathologist.
This step confirms the exact type of cells involved, not just their appearance.
Results usually take a few days, which can feel like a long wait, but accuracy matters more than speed here.
Dr Viraj Lavingia, a medical oncologist based in Ahmedabad, often reminds patients that a biopsy result is the single most reliable piece of information in the entire diagnostic process — everything else builds on top of it.
Imaging Tests: Understanding the Bigger Picture
Once cancer is confirmed, doctors need to understand its size and whether it has spread anywhere else. This is where imaging comes in.
CT scan – gives a detailed view of the abdomen and chest to check for spread to organs like the liver or lungs.
MRI – particularly useful for rectal cancers, offering a clearer picture of the tumor's exact location and depth.
PET-CT scan – helps detect even small areas of spread that other scans might miss, especially useful in complex cases.
These scans, combined with the biopsy result, allow doctors to determine the stage of the cancer, which then shapes the entire treatment plan.
Blood Tests: A Supporting Piece, Not the Full Picture
Blood tests alone can't diagnose colorectal cancer, but they play a useful supporting role.
A tumor marker called CEA (carcinoembryonic antigen) is often checked, mainly to help track treatment response later on.
Routine blood counts help assess overall health and detect issues like anemia, which can sometimes be linked to internal bleeding.
It's worth noting that these tests are supportive tools, not standalone diagnostic proof colonoscopy and biopsy remain the gold standard.
Bringing It All Together
Once all the results are in, your medical oncologist reviews everything together colonoscopy findings, biopsy results, imaging, and blood work to build a complete, accurate picture before recommending treatment.
Patients researching cancer specialists in Ahmedabad often appreciate that Dr Viraj Lavingia takes time to walk through each of these results personally, rather than simply handing over a report and moving on.
A Simple Takeaway
Diagnosis might feel like a long process, but each step exists for a reason to make sure your treatment plan is based on accurate, complete information rather than guesswork. Knowing what to expect at each stage can make the entire experience feel far more manageable.

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