Objective measurement of tissue water in clinical practice
What is Lymphedema
Lymphedema is a chronic condition where lymphatic system’s ability to transport lymph fluid is reduced, leading to swelling in specific parts of the body, leading to fluid accumulation in tissues. Lymphedema may occur following the removal of lymph nodes, typically affecting the torso and/or the limb on the operated side. It is commonly seen in patients after cancer treatments such as surgery and radiation therapy.
Progression and Impact of Lymphedema
In its early stages, lymphedema is often associated with a feeling of heaviness, pressure, or discomfort rather than pain. However, as the condition progresses, swelling may become persistent and more difficult to manage. Advanced lymphedema can significantly reduce quality of life, limit mobility, and create challenges in daily and social activities. The body’s resistance to infections is also decreased, increasing susceptibility to bacterial infections such as erysipelas.
Over time, untreated lymphedema may lead to tissue changes such as fibrosis, where the tissue becomes hardened. Skin integrity may also be compromised, increasing the risk of infections and delayed wound healing, and in severe cases, leading to skin breakdown or chronic wounds. Early detection and consistent monitoring are therefore essential to prevent progression and support effective, targeted treatment.
Need for Early Detection and Monitoring
Early detection and consistent monitoring are therefore essential to prevent progression and support effective, targeted treatment. However, traditional assessment methods - such as limb circumference measurements or water displacement - often lack sensitivity and fail to detect localized or early-stage swelling. Delfin LymphScanner provides a modern solution by enabling objective, localized, and real-time measurement of tissue water content. LymphScanner is also effective in body areas which are difficult to measure with traditional methods.
How LymphScanner Works
The LymphScanner measures tissue dielectric constant (TDC), which correlates directly with tissue water content.
The result is displayed as PWC (Percentage Water Content) — a numerical value that reflects the level of fluid in the measured tissue.
- The probe is placed gently on the skin
- Measurement takes only a few seconds
- The PWC value is displayed immediately
This allows clinicians to detect even subtle changes in tissue water that are not visible or palpable.
Measurement Modes: Spot and Scan
The LymphScanner offers two measurement modes depending on the clinical need:
Spot Mode
- Measures a single location
- Provides an absolute PWC value
- Ideal for:
- localized assessment
- head & neck measurements
- comparison to reference values
Scan Mode
- Compares two measurement sites
- Automatically calculates a PWC ratio
Ratio = PWC (affected site) / PWC (reference site)
- Enables objective comparison between:
- healthy vs affected tissue
- operated vs non-operated side
This is commonly used in arm, breast, and lower limb assessments.
Why Objective Measurement Matters
The LymphScanner transforms lymphedema assessment from subjective observation into quantifiable clinical data.
It enables clinicians to:
- Detect lymphedema at an early stage
- Identify localized swelling areas
- Monitor changes over time
- Evaluate treatment effectiveness
- Support clinical decision-making with data
Clinical Value in Practice
For Clinicians
- Standardized and reproducible measurements
- Clear documentation for patient follow-up
- Improved treatment planning and targeting
- Early detection reduces risk of complications
For Patients
- Clear, numerical feedback on their condition
- Better understanding of treatment effects
- Increased motivation and engagement
- Reduced uncertainty about disease progression
Performing a Measurement
LymphScanner measurements are quick and easy to perform in daily practice.
Basic workflow:
- Select measurement mode (Spot or Scan)
- Place the probe on the skin
- Record the PWC value
- Repeat for comparison site if needed
- Interpret results based on:
- ratios (Scan mode)
- reference values or clinical context
For increased reliability, especially in research or detailed clinical evaluation, averaging multiple measurements per site is recommended.
Standardized Measurement Protocols
To ensure consistency and reliability, Delfin provides standardized measurement protocols for different anatomical areas:
- Upper limb (arm)
- Breast
- Lower limb (leg)
- Head & neck
These protocols define:
- measurement locations
- sequence of measurements
- interpretation principles
Using standardized protocols ensures reproducible results across clinicians and time points.
Download Materials
Lymphedema Assessment Guide
Download a detailed overview of LymphScanner measurement principles, clinical applications, and benefits:
Measurement Protocols (ZIP)
Download all standardized measurement protocols for different body areas in one package:
Watch Measurement videos
👉 Learn to Use the LymphScanner in Clinical Practice
Indication of Use
FDA clearance 510(k) in USA: LymphScanner is a device utilizing inter-aim ratios of tissue dielectric constant (TDC) that supports local assessment of tissue water differences between affected and contralateral non-affected arm tissues to aid in forming a clinical judgment of unilateral lymphedema in adult women. (K220557)
EU: LymphScanner is used to aid in forming a clinical judgement of edema at any soft tissue site of the body
Bring objectivity into lymphedema assessment
With Delfin LymphScanner, clinicians can move beyond subjective evaluation and rely on precise, objective tissue water measurements. This enables earlier detection, more targeted treatment, and consistent follow-up - supporting better outcomes for patients across all stages of lymphedema.
