Doctors use blood tests to look for disease-related signals and to assess your health, but these methods are not used to confirm a diagnosis of ovarian cancer. Abnormal test results may indicate a problem with an organ or system in the body, which may be caused by ovarian cancer or by another health condition. Blood tests in combination with other initial tests can be used to evaluate ovarian cancer, and periodic reviews can also be used to evaluate the effectiveness of treatment and adverse effects of treatment. To perform a blood test, a needle is inserted into a vein, usually the elbow vein, and a certain amount of blood is drawn and sent to the laboratory for testing. The common blood tests for ovarian cancer include but not limited to the following I. Complete blood count analysis A complete blood count analysis includes counting red blood cells, white blood cells and platelets. Your doctor wants to know if your body has enough red blood cells to carry oxygen, enough white blood cells to fight infection, and enough platelets to inhibit bleeding. Your complete blood count may be abnormal due to cancer or other health problems, and may be too low or too high. Second, blood biochemistry tests Blood biochemistry tests detect the levels of different chemicals in the blood. These chemicals come from the liver, bones and other organs or tissues. This test allows doctors to assess the health of the liver, kidneys, and other organs. Abnormal blood biochemistry test results, either too high or too low, may indicate abnormal organ function. Abnormal blood biochemistry levels may be caused by the spread of cancer or other diseases. III. Liver Function Test The liver is an organ that performs many important tasks, such as removing toxins from the blood. Liver function tests check the chemicals produced by or processed by the liver. High or low liver function levels may be a sign of liver damage or the spread of cancer. Liver function tests are usually performed at the same time as blood biochemistry tests. IV. CA125 and other tumor markers A tumor marker is a substance that can be found in tissues or fluids and may signal cancer.CA125 is a tumor marker for ovarian cancer. It is a glycoprotein that can be produced by both normal cells and ovarian cancer cells. elevated CA125 levels may be a sign of ovarian cancer or other health problems. The CA125 test is used to detect CA125 levels in the blood. This test cannot be used alone to diagnose or confirm ovarian cancer, but if your doctor suspects ovarian cancer, a CA125 level may be measured along with other initial tests. CA125 levels can also be used to assess the effectiveness of treatment during and after treatment.