A measurement, such as in blood or urine, that reflects a nutrient's function is termed:

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A biological marker is a measurement that reflects a nutrient's function within the body, such as levels of a particular vitamin or mineral in the blood or urine. Anthropometric markers measure physical characteristics such as height and weight, while clinical markers measure health indicators such as blood pressure and cholesterol levels. Physical markers are not typically used in nutrition science.

A Measurement, Such as in Blood or Urine, That Reflects