Hi,
Without knowing details: it will be a challenge. Our ADC's resolution is not high enough to detect these small differences. An amplifier may solve that, but can create new obstacles. It also depends a.o. on the region the measurements are supposed to be in.
The NHS3152 IC is targeting therapy adherence monitoring and logging use cases, where it can detect and track pill intakes. It is less suited as a general purpose ADC.
KR,
Dries.