The bus-voltage register, flags included.
The bus voltage in millivolts.
The current register.
The current step the calibration programmed, in microamps per count.
The current in microamps; negative flows the other way through the shunt.
Whether the part's arithmetic overflowed, leaving current and power meaningless.
The power register.
The power in microwatts.
The shunt-voltage register.
The shunt voltage in microvolts.
One INA219 conversion: the four result registers as read, and what they mean.