AFE4300: How to determine tissue contact using BCM

Part Number:AFE4300

Dear Community,

I'm using AFE4300 for measuring body composition. I made some electrodes and connect them to IOUT and VSENSE. However in idle state (no skin contact), I get BCM reading about I:1000~2000 Q:-60~+60 in IQ mode, which is approximately 100~200 Ohms. In working state(skin contact), I get BCM reading in hundreds. But I cannot guarantee if others may get higher results.

So how can I tell if there is skin contact from the data?

Thank you very much!