Types of blood test include a full or complete blood count, erythrocyte sedimentation rate and blood metabolic panel, according to the National Heart, Lung and Blood Institute and the U.K.'s National Health Service. Bloo... More »

A blood test doesn't help in diagnosing osteoarthritis, but it helps in diagnosing other types of arthritis or inflammatory conditions. For example, the people with rheumatoid arthritis show a higher level of antibodies ... More »

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A blood test can indicate a type of cancer, according to Mayo Clinic. However, these tests are not always 100 percent accurate. Even noncancerous disorders can cause elevated levels of tumor markers. More »

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Doctors diagnose the cause of anemia, or low hemoglobin count, through several methods: reviewing medical histories, a physical exam and using the results of tests, says the National Heart, Lung and Blood Institute. Anem... More »

Low platelet count can be caused by acquired or inherited conditions, which may cause the body's bone marrow to decrease platelet production, according to the National Heart, Lung, and Blood Institute. The body may destr... More »

Symptoms of a low lymphocyte count, or lymphocytopenia, include unusual, persistent or repetitive infections, according to the National Heart, Lung and Blood Institute. Other signs include enlarged spleens and swollen ly... More »

The National Heart, Lung, and Blood Institute shows normal ranges for the most common values detected on a blood test, including red blood cell count, white blood cells, platelets, hemoglobin, hematocrit and mean corpusc... More »