RJL systems QUANTUM III, User Manual, Page: 21 / 29

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How do I measure frame size?
There are two methods for measuring frame size:
•
The Precise Method
First, measure the patient's height. Next, use a measuring tape to measure the circumfer-
ence of the patient's wrist. (make sure to use the same units for both measurements. Do
not mix inches and centimeters.) Divide the height by the wrist circumference. If the re-
sult is greater than 10.4, the patient has a small frame. If it is less than 9.6, the patient has
a large frame. Otherwise, the patient has a medium frame.
•
The Easy Method
A simpler, albeit less precise, method is to have the patient wrap the thumb and forefin-
ger of one hand around the wrist of the other hand. If the thumb and forefinger overlap,
the person has a small frame. If the tips of the thumb and forefinger touch, the person has
a medium frame. If there is a gap, the person has a large frame.
How is target weight calculated?
On the subject input form, you can choose to either enter in your own value for target
weight, or you can allow the Q3 to calculate one for you. The formulas that the Q3 uses to
calculate target weight are called the “Hamwi Ideal Weight Equations” which are as follows:
•
For Males
Target weight = 106 + 6 x ((height in inches) - 60)
•
For Females
Target weight = 100 + 5 x ((height in inches) - 60)
Once you have a target weight, if the patient has a small frame, adjust it for the patient’s
frame size. If the patient has a large frame, add 10% to get the final value. If the patient has a
small frame, subtract 10%.
BIA QUESTIONS