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LMP91000: Need to reduce voltage/currented sensed at the electrode.

Part Number: LMP91000

So in the application of this device, I occasionally see the Vout levels go negative, which isn't necessarily a problem, however, my micro controller does not pick up these values (i.e. the values just read 5,4,3,2,1,0,0,0,0,0,0...... 0; instead of showing the negative values). Would the Internal 0 or the TIA gain have to be adjusted in order to shift the Vout levels upwards so that a sensing application that might normally have a low peak at -50 mV would have its low peak adjusted to 0 mV, along with all of the other values, respective of their original values, everything be shifted up.  Is this possible?

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