Tuesday, October 13, 2015

Upper segment to lower segment ratio (US:LS ratio) mnemonic


I was asked to measure the US:LS in a child. My professor was suspecting Rickets. So let's learn the normal ratios is various age groups!

Seven is the magic number. So we'll start with seven, end with seven.

At birth, the ratio is 1.7
At seven years of age, it's 1.

At 3 years, it's 1.3

Easy, ain't it?

Now go numerically till 4 and decrease the ratio. You're done!

Birth 1.7
6 months 1.6
1 year 1.5
2 years 1.4
3 years 1.3
4 years 1.2
7 years 1

That's all!



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