What does "L4" 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.
"L4" refers to the fourth lumbar vertebra, which is one of the bones in the lower back. The lumbar vertebrae are numbered from L1 to L5, with L1 being the highest (closest to the chest) and L5 being the lowest. When a medical report mentions "L4", it's talking about this specific bone in the lower back.
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