VEGF, vascular permeability factor, VPF
This test measures the amount of vascular endothelial growth factor (VEGF) in your blood. VEGF is a substance that helps encourage the growth of new blood vessels. Your body makes more VEGF in certain situations. For example, if your tissues aren't getting enough oxygen, they may make more VEGF to prompt new blood vessels to grow to bring in more oxygen. Your lungs contain VEGF because good blood flow is vital there.
But VEGF also plays a role in cancer growth. Cancers need an ample blood supply. As a tumor grows larger, its cells can become hungry for oxygen, and the cancer encourages new blood vessels to grow to supply it. Most tumors show higher levels of VEGF. Sometimes, higher levels mean a lower chance of survival. In addition, VEGF may be important in the process of metastasis, in which cancer spreads to other places within your body.
VEGF can also promote "leakiness" of blood vessels, which can lead to swelling in surrounding areas. This can be especially harmful during brain cancer, because it can increase pressure within the skull and lead to brain damage.
Certain cancer treatment target VEGF, and this test may be used to tell how well the treatments are working.
You may need this test if your doctor wants to find out how quickly a tumor is growing or whether your cancer is responding to treatments that counteract VEGF. A number of cáncer treatments work against VEGF.
If you have cancer, your doctor may order tests to check for possible complications linked to certain anti-VEGF treatments. These complications include:
High blood pressure
Many things may affect your lab test results. These include the method each lab uses to do the test. Even if your test results are different from the normal value, you may not have a problem. To learn what the results mean for you, talk with your health care provider.
Higher levels of VEGF have been linked to many types of cancer.
The test requires a blood sample, which is drawn through a needle from a vein in your arm.
Taking a blood sample with a needle carries risks that include bleeding, infection, bruising, or feeling dizzy. When the needle pricks your arm, you may feel a slight stinging sensation or pain. Afterward, the site may be slightly sore.
If your blood sample is mishandled by your health care provider or the lab, the results may not be accurate.
You don't need to prepare for this test. But be sure your doctor knows about all medicines, herbs, vitamins, and supplements you are taking. This includes medicines that don't need a prescription and any illicit drugs you may use.