Blood and Urine Tests

Blood tests can be used to look for diseases, infections, or inflammation if they are suspected as an underlying cause. Complete blood counts are used to see if blood cell counts are in a normal range. Sedimentation rates can detect inflammation and be used as a diagnostic tool.

Urine tests check for urinary infection or blood in the urine.

Imaging Tests

Imaging tests are not generally required for low back pain and sciatica. They be done under certain circumstances. Examples include:

• Severe or progressively worsening symptoms
• Evaluating any suspected underlying conditions
• Before a procedure or surgery based on the results of tests

Some tests use contrast material to highlight structures so they are easier to see. Common tests include:

• X-ray
• MRI scan
• CT scan
• Myelography

Other Tests

Other tests may include:

• Nerve conduction study —tests the speed and strength of electrical activity in a nerve
• Electromyography —tests the electrical activity of a muscle at rest and during a contraction
• Biopsy —a tissue sample is taken and evaluated under a microscope