Which statement about lymphedema is true?

• A. Lymphedema edema is typically protein-rich due to impaired drainage.
• B. Lymphedema is always due to venous hypertension.
• C. Lymphedema cannot be measured.
• D. Lymphedema is not affected by treatment.

Answer: (A)

Lymphedema results from the lymphatic system not effectively removing fluid and proteins from the tissue, so fluid accumulates in the interstitial spaces. Because the drainage pathway carries proteins, the trapped fluid becomes protein-rich, which stickily attracts water and can lead to tissue changes over time. This protein-rich nature of the edema is a key feature that helps distinguish lymphedema from other types of swelling.

That’s why the statement describing lymphedema edema as typically protein-rich due to impaired drainage is the best fit. While venous hypertension can cause edema, it is not the defining mechanism of lymphedema; edema from venous problems isn’t driven by lymphatic protein retention in the same way. Lymphedema can be measured—through limb circumference or volume measurements, bioimpedance, and imaging—so it isn’t unmeasurable. And it is treatable: lymph drainage techniques, compression, exercise, and skin care can reduce swelling and improve function, so the idea that it isn’t affected by treatment isn’t accurate.