Are there any risks to the test?There is very little risk to having a blood or urine test. After a blood test, you may have slight pain or bruising at the spot where the needle was put in, but most symptoms go away quickly.There is very little risk to having a spinal tap. You may feel a little pinch or pressure when the needle is inserted. After the test, you may get a headache, called a post-lumbar headache. About one in ten people will get a post-lumbar headache. This can last for several hours or up to a week or more. If you have a headache that lasts longer than several hours, talk to your health care provider. He or she may be able to provide treatment to relieve the pain. You may feel some pain or tenderness in your back at the site where the needle was inserted. You may also have some bleeding at the site.
