Flashcards in Lecture # 4 Anthropometrics Deck (23):
What are two well-validated indicators of malnutrition?
Weight-loss and underweight status
Limitations of anthropometric measurements
really sick patients can become malnourished before anthropometric measurements reflect that; edema and fluid changes can alter measurements; extent and rate of change must be assessed; other history must be included
Why is height/length an important anthropometric measurement?
Assess appropriate weight in adults (assess malnutrition); Assess appropriate growth in children (malnutrition)
What is the most accurate tool one can use to measure the height of patient?
What are some accurate ways one can estimate the height of a patient?
ARK (Arm Span, Recumbent length, and Knee height)
measuring the length of a patient from the top of the head to the bottom of the feet in a level (supine) position; bed length tends to be greater than standing height by approx. 1 inch
Why would a clinician use a knee height measurement?
recumbent length difficult to obtain. not significantly affected by the aging process; can also estimate weight utilizing knee height and arm circumference.
How is a knee height measurement performed?
Use left leg; knee and ankle positioned at 90; most accurate when taken in the recumbent postion
Inch to centimeter
1 inch = 2.54 cm
What are the ideal methods for measuring frame size?
Wrist circumferences and elbow breadth
Wrist circumference formula
r = height (cm)/wrist circumference (cm)
Standard r values small (w/m)
r > 10.9 ; r > 10.4
standard r value medium (w/m)
r = 10.9-9.9 ; r = 10.4-9.6
Standard r value large (w/m)
How are frame sizes used in clinical practice?
They are used in research if the research needs such data, or it is used in the clinical setting if it is apparent the patient has an odd frame.
Method used to determine the DBW (Desirable body weight) for a patient at a specific height
Hamwi method equation (Men)
106 lbs for 5ft and 6 lbs per inch over 5ft and minus 6 lbs per inch under 5ft
Hamwi method equation (women)
100 lbs for 5ft plus or minus 5 lbs for an inch over or under respectfully.
Large/small frame accommodation for Hamwi method
add or subtract 10%
Weight (kg)/Height (m) squared or short-cut weight (lbs) X 703 /height in inches
What are the two biggest predictors of malnutrition?
weight loss and underweight status
What BMI value for those over the age of 65 indicate a nutritional risk?