L4 to S1

What does "L4 to S1" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.

Explanation

"L4 to S1" refers to specific areas of the spine. The spine is divided into different sections, and each section is labeled with a letter and a number. "L4" refers to the fourth vertebra in the lumbar, or lower, section of the spine. "S1" refers to the first vertebra in the sacral, or bottom, section of the spine. So, "L4 to S1" means the area of the spine that stretches from the fourth lumbar vertebra to the first sacral vertebra.

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