As an expert in the field of medical diagnostics, I can provide you with a comprehensive overview of how cancer can be detected. There are several methods and tests that healthcare professionals use to detect cancer, and each type of cancer may require a different approach. Here's a detailed explanation: 1. **Physical Examination and Patient History:** Doctors often begin with a physical examination and take a detailed patient history to identify any symptoms or risk factors that might suggest cancer. 2. Imaging Tests: Techniques such as X-rays, computed tomography (CT) scans, magnetic resonance imaging (MRI), and positron emission tomography (PET) scans can help visualize internal structures and detect tumors. 3. Laboratory Tests: A Complete Blood Count (CBC) can sometimes detect blood cancers if it reveals an abnormal number of blood cells or abnormal cells. Other blood tests can look for tumor markers, which are substances that may be higher than normal in people with certain types of cancer. 4. Biopsy: A biopsy involves taking a sample of tissue for examination under a microscope. This is often the most definitive way to detect cancer. 5. Blood Marrow Biopsy: For blood cancers, a bone marrow biopsy may be performed to extract a sample of the bone marrow for examination, which can help confirm a diagnosis. 6. Endoscopic Procedures: Endoscopy allows doctors to look inside certain parts of the body, such as the colon or stomach, to check for abnormalities. 7. Molecular and Genetic Testing: These tests can identify specific genetic mutations associated with certain types of cancer. 8. Screening Programs: Regular screenings, such as mammograms for breast cancer or Pap tests for cervical cancer, are designed to detect cancer in its early stages. It's important to note that no single test can detect all types of cancer, and some cancers may not cause any noticeable symptoms in the early stages. Therefore, a combination of tests and regular check-ups is often necessary. read more >>

Complete blood count (CBC). This common blood test measures the amount of various types of blood cells in a sample of your blood. Blood cancers may be detected using this test if too many or too few of a type of blood cell or abnormal cells are found. A bone marrow biopsy may help confirm a diagnosis of a blood cancer.read more >>