Can you miss cancer in a blood test?

Aside from leukemia, most cancers cannot be detected in routine blood work, such as a CBC test. However, specific blood tests are designed to identify tumor markers, which are chemicals and proteins that may be found in the blood in higher quantities than normal when cancer is present.

moffitt.org - Can Blood Work Detect Cancer? | Moffitt

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May 03, 2022

Having blood work performed as part of an annual wellness checkup is one of the most effective steps you can take to protect your health and maximize your well-being. Using the results of a routine blood test, such as a complete blood count (CBC), your physician can create a baseline for your overall health. By comparing the results of subsequent blood tests to the baseline, your physician can then identify changes that may warrant further investigation. That way, you might learn about a health issue early on, allowing you time to address it before you develop noticeable symptoms. Among other things, routine blood testing can detect nutritional deficiencies, high cholesterol, anemia, diabetes, hormonal imbalances, infection and problems with thyroid, liver or kidney function. As such, blood work can provide a host of valuable health-related information. This may lead you to wonder if you could have cancer if your blood tests are normal.

Blood testing and cancer

In addition to serving as a general health "barometer," blood work plays an important role in diagnosing certain types of cancer. For instance, leukemia, a cancer that affects the body’s blood-forming tissues, can sometimes be detected in a routine blood test. Specifically, the CBC test measures the levels of the various types of blood cells circulating in the bloodstream, including red blood cells, white blood cells and platelets. Although an abnormal result could point to leukemia, it is important to note that it could also indicate a benign inflammatory condition. Therefore, a physician will typically order follow-up testing to confirm or rule out a leukemia diagnosis. Aside from leukemia, most cancers cannot be detected in routine blood work, such as a CBC test. However, specific blood tests are designed to identify tumor markers, which are chemicals and proteins that may be found in the blood in higher quantities than normal when cancer is present. One common example is the prostate-specific antigen (PSA) test, which measures the level of PSA in the blood. An elevated level of PSA—a protein produced by the prostate gland—may be a sign of prostate cancer. Although blood work cannot currently be used on its own to conclusively diagnose cancer, it is often used in conjunction with other diagnostic tests, such as:

A physical examination

Imaging tests, such as X-rays, CT scans, MRIs, ultrasounds, bone scans and PET scans

A urinalysis

A Pap smear (for cervical cancer)

A mammogram (for breast cancer)

An endoscopic procedure, such as a bronchoscopy (for lung cancer) or colonoscopy (for colorectal cancer)

A high-sensitivity fecal occult blood test (for colorectal cancer)

A myelogram (for a spinal cord tumor)

A biopsy, such as a needle, skin or surgical biopsy

Cancer screening and risk assessment

A recognized leader in the development of groundbreaking scientific technology that is widely used to detect or treat many types of cancer, Moffitt Cancer Center is proud to offer the latest cancer screening tests as well as genetic testing for cancer risk. If you would like to learn more, you can request an appointment with a specialist by calling 1-888-663-3488 or completing a new patient registration form online. As our patient, you can feel confident that you are a priority of Florida’s top cancer hospital, which is changing the model and delivering nationally ranked care in new and transformative ways. Our goal is to connect each new patient with a caring cancer expert within one day.

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What are the symptoms of Stage 1 cancer?

Today, people are living longer than ever after a cancer diagnosis due to improved cancer screenings. ... But to be safe, talk to your doctor about these five signs and symptoms. Unexplained Weight Loss. When you lose weight for no reason, call your doctor. ... Fatigue. ... Fever. ... Pain. ... Skin Changes.

hopkinsmedicine.org - Early Cancer Warning Signs: 5 Symptoms You Shouldn't Ignore

Unexplained Weight Loss When you lose weight for no reason, call your doctor. A loss of 10 pounds or more could be nothing to worry about. However, in rare cases, it may be the first sign of cancer. Fatigue This isn’t fatigue similar to how you feel after a long day of work or play. Extreme fatigue that doesn’t get better with rest can be an early sign of cancer. Cancer uses your body’s nutrients to grow and advance, so those nutrients are no longer replenishing your body. This “nutrient theft” can make you feel extremely tired. There are lots of underlying causes of fatigue, many of them not cancer-related. If your symptoms are severe enough to affect your quality of life, call your doctor. Fever Fever can be a common symptom of colds and the flu, and clears up on its own. Certain characteristics of recurring fever can foretell a possible cancer connection. You should pay particular attention if: A fever happens mostly at night.

You have no other signs of infection.

You experience night sweats.

Pain Pain is another symptom that can be caused by a multitude of health issues, most of which are not cancer. But persistent pain, can also hint at an underlying disease. Cancer can cause pain in different ways, including: A mass or tumor pushing on other areas of your body

The chemicals a cancer releases

Metastasis, or spreading from where a cancer started If you’re experiencing pain that doesn’t go away — and you’re not sure where it came from — your doctor can help with the best next steps.

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