Our expert says:
In the past we have looked at the total value for the spine i.e. for lumbar vertebrae 1-4 only. We still do that, but if there are 2 vertebrae with extremely low values, we average their total. So if your total = -1.7 as a T score, but your 2 lowest values are for example -2.5 and and - 2.9, your T score would be the average of them i.e. - 2.7. The diagnosis of osteoporosis can not be made on the value of one vertebrae only. Obviously your doctor should do some more investigations as to the cause of the low value of this vertebrae (e.g. lithic lesion etc.).
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