Keep in mind that a pulse oximeter may not work at an extremely low level of 80% or less oxygen saturation. Other factors that can affect accuracy include skin thickness or pigment, cold hand ...

If your complete blood count shows low red blood cells, you may have anemia during pregnancy, which may cause symptoms like ...

Loaches are known to absorb oxygen through the rectum when in a low-oxygen environment. Mammal rectums are known for having a high blood flow that makes it easier for the body to ingest drugs.