Can you tell me how precise is cancer blood tests?

Setting? In a patient with active cancer, these blood tests (I assume you are talking about tumor markers like CEA or CA27.29) are useful to see how the cancer responds to therapy. They are also used to follow up a patient in remission to detect if the cancer recurs (not as good for that). As screening for people who never had cancer, they are, with rare exceptions, useless and thus not recommended.

Related Questions

Can you tell me how accurate is cancer blood tests?

What setting? In a patient with active disease, "cancer blood tests" (I assume you are talking about tumor markers like CEA) are useful to see how the cancer responds to therapy. They are also used to follow up a patient in remission to detect if the cancer is coming back but they are not as good for that. As screening for people who never had cancer, they are mostly useless and should not be done routinely. . Read more...

Please tell me, could cancer be tested by blood tests?

Depends on type. Some cancers can be diagnosed and followed by blood tests. Leukemias (which are blood cancers) are diagnosed by examining blood and bone marrow. Some solid tumors (such as prostate cancer) can be followed by measuring a tumor marker in the blood (psa). It depends upon the type of cancer. Hope that this helps. Read more...

Are there blood tests that can tell you for sure if you have cancer?

Usually no. Blood tests can definitely identify certain cancers, such as leukemias and some lymphomas, and they can strongly suggest other cancers if certain tumor "markers" are present in elevated concentrations. Most cancers are not detectable by blood tests, however, and are not even suggested by them. Read more...

I know blood tests cant definitively say whether someone has cancer, but can they tell you that you dont have cancer by having a normal cell count?

Not enough. Blood test cannot either rule out or confirm cancer. Particularly the ones we get in the ED or for a healthy check up. Some tests could correlate with the presence of a cancer. They are called tumor markers. They should be checked only after the diagnosis has been established by a biopsy, then you can follow them as surrogate for response to treatment. . Read more...
Not always,but it ca. Blood tests are a way of looking for early clues for a chronic illness like Cancer. Blood cancer is easily diagnosed from blood tests. But for most common cancers, we need to do a physical exam and imaging (X-ray) studies followed by a biopsy of any abnormal areas. That is how the final definite diagnosis is made. The costs can be minimsed by an experienced physician who can use his hands and comm. Read more...

Can a doctor tell iif you have cancer by looking at your blood tests?

Blood tests. Some blood tests are screens for serum markers of malignancy, and some blood tests are to assess the cells of the blood for irregularity (leukemia). Pathologists interpret these tests. However, if your question means, for example, if you have blood drawn for cholesterol levels, do pathologists also look at that same sample for possible cancer, the answer is no. Read more...

Blood tests cant tell if u have cancer but Can cancer be ruled out from blood test? If your cell counts are normal does that mean you're cancer free?

No. There are many tests other than a "blood test" that can show the presence of cancer (radiologic tests, biopsy, cytology, etc.). Read more...
NO. Blood cell counts gives you clues only and that is when the. Cancer is advanced. ROUTINE blood counts and blood chemistry can be normal when cancer is in its early stages. That is why we use screening tests to detect early cancer. Read more...
Not just yet. Good question. We have been trying to come up with tests to do just that. There isn't a magical test just yet to rule out all types of cancer from a blood test. Some cancers do have specific proteins associated with them, we call them tumor markers that we check in blood. They are somewhat specific to particular cancers and can help detect cancer early on, detect recurrence and guide treatment. Read more...