What does "L1" 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.
"L1" in a medical document refers to the first lumbar vertebra, which is one of the bones in the spine. The spine is divided into different sections, and the lumbar section is in the lower back area. So, when a report mentions "L1", it's talking about a specific bone in the lower back part of the spine.
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