Good luck... In France we have no BP, no ECG and no SPO2.
Samsung never communicate. Totally ***** customer support honestly.
Many watches even at a very low price offer spo2/vo2max. Xiaomi will release one in the next few months at 1/3rd of the price of GW3.
For any other brand, it takes 4-5 months to get an approval for this kind of feature.
But for samsung things seem to be different, Galaxy Active2 has been waiting forever.