Cardy Potassium Ion Meter

Calibrating the Cardy Potassium Meter

Calibrating the Cardy isn't complicated. It's basically wash and rinse, wash and rinse.  

To clean the sensor you can use distilled water, which is a lot less expensive than buying refills of the "de-ionized" water that comes with the kit. And don't use their testing tape to clean the sensor. Buy Kleenex brand facial tissues in those little pocket packs. They are potassium-free, and work just fine.

To calibrate the meter first:

Saliva K+ Calculator

Saliva to Serum Potassium Correlations

Correlation of Saliva and Human Blood Serum Potassium Results

The Cardy results are reported in ppm (parts per million), so saliva results are calculated by multiplying the saliva potassium measurements on the Cardy Potassium Meter by 0.026 to convert the values from ppm to mmol/L.

The correlation results are based on normal human ranges for blood serum as 3.5 - 5.5 mmol/L and for saliva as 8 - 40 mmol/L. The saliva values, as measured by the Cardy K+ meter, have proven accurate when compared to serum values drawn and processed in labs.

Testing Potassium Levels with the Cardy Potassium Ion Meter

For those who still own or use the Cardy C-131, the directions are below. The sensors on the older Cardy meters, those produced 10-15 years ago, were more reliable than newer ones. The Cardy C-131 cannot be considered entirely reliable any longer. The newer meter, the Laqua Twin, is totally unreliable and should not be relied on as a testing device.  

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