Why does my SPO2 reading differ between my feet and hands

There is a variability of reasons why oximetry values could differ, but here are some common ones: calibration mistakes, cold boundaries, artifact motion, skewed probe supplied by the Spo2 Probes Suppliers, and hidden nails or tissue over the probe location. Oximetry is an estimate of the bulk of atoms of oxygen in the blood. Because the light must be passed through the digit or toe, ear, what have you, everything that can dislocate the stream of light can disturb an oximeter as well. Usually, because hands are left out and exposed, fingers may be a little icier than enclosed toes, but they are about the same as unprotected ones. Though, it's not rare for a lower limb outlying circulation diminishing to be present. This can be benevolent or uncontrolled. At any rate, as a consequence, with less warm blood running through the vessels in the lower limb peripheral additions, the last place the blood grasps (i.e. the toes) trend somewhat colder.
The reason the capacity may vary also be contingent on blood flow. If the flow in the hands and feet vary even somewhat, it can be expected that measurements between the two will as well. Hyperventilation has to do with how the brain retorts to the condition. When somebody hyperventilates, they quickly hurry respirations, and gas exchange cannot happen evenly. As such, a slight desaturation event may happen as the body processes and modifies. This occurs because the breathing group neurons are signaled to bring breathing under control from the absence of carbon dioxide noticed in the bloodstream and within the blood-brain barrier. When the breathing rate increases quickly, the subsequent breaths are low and lack rich oxygen absorption compared to usual autonomic breaths.