A blood hemoglobin measurement of 13.5 g/100 ml would be at ratio level of measurement.
The ratio scale is a level of measurement that is quantitative and has equal distances between each point. The ratio scale differs from other scales in that it has a true zero. In other words, a value of zero on a ratio scale indicates the absence of the variable you are measuring.
The Kelvin scale is one of the most prevalent illustrations of a ratio scale. The actual zero point exists on a Kelvin scale. Accordingly, 40 degrees Fahrenheit or Celsius are not twice as hot as 20 degrees. Due to the existence of actual zero, 40K is twice as hot as 20K on a Kelvin scale.
Therefore, a blood hemoglobin measurement of 13.5 g/100 ml would be at ratio level of measurement.
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