Generally speaking, blood oxygen saturation above 94% is normal, but if it is lower than 94%, it suggests the existence of insufficient oxygen supply, which may be caused by respiratory diseases, such as pneumonia, pulmonary embolism and so on. However, Huawei Watch has set a normal interval in the range below 94%, if Huawei Watch shows a lower blood oxygen saturation, this may be due to the watch is not close to the skin, the photoelectric detector does not match the capillaries, or the finger squeezed too hard, resulting in inaccurate measurement results.
If you're worried about your oxygen saturation being low, you can take an oxygen saturation test at a nearby hospital to get a more accurate picture of your health.