Exam

Upper to Lower Segment Ratio

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Upper to Lower Segment Ratio

  • Indications
  1. Growth Assessment
  2. Differentiates collagen bone disease (skeletal dysplasia) from primary spine (e.g. Scoliosis)
  • Technique
  • Measurement
  1. See Sitting Height for an alternative method of calculating segment heights
  2. Lower segment: Top of pubic symphysis to floor
  3. Upper segment: Top of head to top of pubic symphysis
    1. Calculation: TotalHeight - LowerSegmentHeight
  • Interpretation
  • Normal upper to lower ratio
  1. Birth upper to lower ratio: 1.70 (Greatest ratio)
  2. Postpuberty upper to lower ratio: 0.89 - 0.95