Prediction Marker & Impedance Ratio

What is Prediction Marker/Impedance Ratio (IR)?

The Impedance Ratio is derived by a Bioelectrical Impedance Analysis (BIA) measurement. A small current is used to measure the resistance at difference frequencies against the various tissues in the body. The impedance readings are then translated using validated algorithms. The Impedance Ratio is the ratio between the impedance measured at 200 kHz and 5 kHz.

how does it work?

At 5 kHz (in a healthy subject), the resistance to the flow of the current will be High because the current cannot penetrate the cell membrane. It therefore only measures the Extra-cellular water (ECW). At the higher 200 kHz frequency, the current is powerful enough to penetrate the cell membrane. Therefore, it is ideal to measure both inside (ICW) and outside the cells (ECW). We can then observe the variance between these two values to determine the health of the body tissues.


Including, but not limited to:

  • Help in predicting surgery/recovery outcomes
  • Identifying potential high risk surgery candidates
  • Tracking the effectiveness of rehabilitation post-surgery
  • Raising the awareness of potential complications during hospitalisation
  • Helping in the accurate assessment of cellular health & hydration status


For the full range of Bio Impedance Analysis Devices, check out the Bodystat product page or if you would like to speak to one of our body composition experts, contact us here.

impedance ratio in research

Phase angle and impedance ratio: Two specular ways to analyze body composition.

Impact of oedema on recovery after major abdominal surgery and potential value of multifrequency…

Bioelectric impedance phase angle in carcinoma prostate – a hospital-based study.

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