Differentiates collagen bone disease (skeletal dysplasia) from primary spine (e.g. Scoliosis)
III. Technique: Measurement
See Sitting Height for an alternative method of calculating segment heights
Lower segment: Top of pubic symphysis to floor
Upper segment: Top of head to top of pubic symphysis
Calculation: TotalHeight - LowerSegmentHeight
IV. Interpretation: Normal upper to lower ratio
Birth upper to lower ratio: 1.70 (Greatest ratio)
Postpuberty upper to lower ratio: 0.89 - 0.95
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This page was written by Scott Moses, MD, last revised on 10/31/2008 and last published on 8/7/2019.