The functional tests that I might recommend are: gastrointestinal profiles to evaluate digestion, absorption, gut flora and colonic environment including presence of yeast infections, parasites and inflammation.
Nutritional profiles to evaluate the level of different nutrients such as amino acids, vitamins and minerals in your body.
Metabolic profiles to assess various cellular processes and the efficiency of metabolic function. These include chronic fatigue evaluation, metabolic syndrome profile, cardiovascular risk assessment, cardiovascular health profile.
Hormonal profiles including adrenal stress profile, thyroid screen, female hormone profile, male hormone profile, and osteoporosis risk assessment.