If to study the effects of kidney disease on patient using only blood samples what all aspects can be screened in blood apart from looking for specific biomarkers (ie., NAG, NGAL, KIM1 etc) and RBC/WBC cell count.

What about genetics/genomics? can it be implicated on blood samples to come to any kind of conclusions about any specific thing?

Using limited resources (ie., blood as the only means of assessment) can we generate enough valuable information to reach a specific conclusion? Ie., in this particular case for example what kind of genetic and biological changes could occur in a kidney disease patient (if cause is due to heavy metal toxicity and not due to hypertension or diabetes) that can be significantly assessed (apart from kidney biomarkers) using blood sample of the patient.

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