Biochemical methods involve estimating the level of the nutrient in blood or urine. These methods yield reliable data regarding the nutritional status of the individual with respect to the specific nutrient estimated. Biochemical studies which have been used in nutrition surveys are listed in table.
Advantages of Biochemical Method
Useful in the detection of early changes in body metabolism & nutrition before the appearance of overt clinical signs.
Precise, accurate and reproducible.
Useful to validate data obtained from dietary methods for example comparing salt intake with 24-hour urinary excretion.
Limitations of Biochemical Method
Cannot be applied on large scale
Needs trained personnel & facilities
Table: Biochemical parameters suitable for assessment in nutrition surveys