Body Composition Measurements:

Anthropometric Measurements

Anthropometric equipmentBionutrition staff are trained to measure height, recumbent length, weight, body circumference, waist-to-hip ratio, and skinfold thickness in the adult and pediatric populations.  Special length measurements when height is not appropriate can also be performed.


iDXA scanner in CTRC

Dual Energy X-Ray Absorptiometry (DXA or DEXA) uses a small dose of radiation to determine body composition and bone mineral density (BMD).

OCTRI now has a state-of-the-art GE Lunar iDXA machine and trained, licensed staff available to scan both adult and pediatric study participants. The iDXA has a large scan window and a high arm height and can accommodate participants up to 450 pounds, a full 100 pounds more than our previous DXA device.  In addition, the iDXA offers color-fat mapping, visceral fat quantification, and a full array of bone health applications.

A whole body DEXA scan takes several minutes and requires the participant to remove all metal (in clothing and jewelry) from the body. Bone density scans (hip, spine, forearm) are shorter in duration. 


BOD PODThe BOD PODTM uses air displacement plethysmography to measure body density. Results include body fat and fat-free mass as a percent and total kg of body weight. This test is optimal for obese populations with a body weight maximum of 440 lbs.


There is no radiation exposure during a BOD PODTM. Subjects are required to wear swimsuits or spandex during the test and must be fasting (no foods or beverages) and limit physical activity for 2 hours prior to the test.

Body composition measurements can be preformed on research participants and the general public.

Bioelectical Impedance Analysis (BIA)

Bioelectrical Impedance Analysis (BIA) uses a small electrical current to measure impedance and conductance.  Results include body fat, fat-free mass, and total body water.  The BIA machine uses electrodes that attach to the hand and foot.  The Tanita™ scale requires a standing position without electrodes. The measurement takes approximately 30 seconds to complete.  Prior to each measurement an accurate height and weight are obtained. Shoes and socks must be removed and subjects should be fasting (no foods or beverages) and limit physical activity for at least 2 hours prior to the test.