Which statement best summarizes the diagnostic utility of the straight leg raise test for disc herniation?

Which statement best summarizes the diagnostic utility of the straight leg raise test for disc herniation?

• A. It is highly sensitive for detecting disc herniation.
• B. It has high specificity.
• C. It cannot help identify disc herniation.
• D. It is rarely used.

Answer: (A)

The straight leg raise test is used to assess tension on the lumbosacral nerve roots as they exit the spine, and its main value lies in sensitivity. A negative result makes disc herniation unlikely, so it’s a good rule-out test for radicular symptoms caused by a herniated disk. A positive result can occur with other causes of radicular pain or nerve irritation and is not specific to a disk herniation, so it doesn’t by itself confirm the diagnosis. In practice, imaging is reserved for cases where suspicion remains high despite the exam.

The straight leg raise test is used to assess tension on the lumbosacral nerve roots as they exit the spine, and its main value lies in sensitivity. A negative result makes disc herniation unlikely, so it’s a good rule-out test for radicular symptoms caused by a herniated disk. A positive result can occur with other causes of radicular pain or nerve irritation and is not specific to a disk herniation, so it doesn’t by itself confirm the diagnosis. In practice, imaging is reserved for cases where suspicion remains high despite the exam.