Physical Therapy

Secondary lymphedema is a leading post-treatment complication for many cancer patients.

However, with early detection, appropriate interventions and ongoing monitoring, the symptoms of lymphedema can be managed, and in some cases, even reversed.1

Tracking patient progress

SOZO, the world’s most advanced, noninvasive bioimpedance spectroscopy (BIS) device, offers physical therapists a fast, simple, noninvasive way to measure the impact of physical therapy on healthy patients following treatment. SOZO assesses multiple fluid compartments and body composition at the same time—without labor-intensive dilution or underwater weighing techniques2—to quantify improvements in skeletal-muscle mass or decreases in fat mass.

Learn more about SOZO

Monitoring overall health

Based on the knowledge that BMI is an imperfect measure of body fat, a team of researchers hypothesized that greater body fat percentage, independent of BMI, would be associated with increased health risks. In a cohort study3, they examined associations between BMI and percent fat with mortality. The study found that having a higher percent body fat or a low BMI was independently associated with reduced survival. This “obesity paradox” indicates that overweight and moderately obese patients with certain chronic illnesses actually outlive thinner people with the same conditions.3

As a more direct and accurate measurement of body composition, SOZO is recommended as an effective tool for monitoring overall health.4

BIS Technology

ImpediMed® pioneered the use of BIS technology

Impedimed product

SOZO combines BIS and L-Dex® technology

Clinical evidence

ImpediMed’s BIS technology has been extensively studied in over 40 medical conditions and disease states.

View research


  1. ISL. The diagnosis and treatment of peripheral lymphedema: 2013 consensus document of the International Society of Lymphology. Lymphology. 2013;46(1):1-11.
  2. Van Loan, et al. Use of bioimpedance spectroscopy (BIS) to determine extracellular fluid (ECF), intracellular fluid (ICF), total body water (TBW), and fat-free mass (FFM). p. 6770. In Ellis K, ed. Human Body Composition: In Vivo Measurement and Studies. New York: Plenum Publishing Co.; 1993.
  3. Padwal R, Leslie WD, Lix LM, et al. Relationship among body fat percentage, body mass index, and all-cause mortality: a cohort study. Ann Intern Med. April 19, 2016;164(8):532-541.
  4. McBeth M. MPT, CLT-LANA 2019 American Physical Therapy Association (APTA). Go beyond BMI—SOZO: taking therapy further. Combined Sections Meeting (CSM).