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Upper to Lower Segment Ratio

Aka: 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

Family Practice Notebook

Patients should address specific medical concerns with their physicians.

Although access to this page is not restricted, the information found here is intended for use by medical providers.

This page was written by Scott Moses, MD, last revised on 10/31/2008 and last published on 6/18/2013.

This is one of 5909 pages in the Family Practice Notebook