Systems, devices, and methods for developing a model for use when performing oximetry and/or pulse oximetry and systems, devices, and methods for using a fetal oximetry model to determine a fetal oximetry value

A method comprising:

• receiving, by a processor, light transmission data, the light transmission data corresponding to an optical signal that is detected by a photodetector and converted into the light transmission data, the optical signal being a composite of light that is incident on a pregnant mammal's abdomen and a fetus contained within the pregnant mammal's abdomen;
• inputting, by the processor, the light transmission data into an in vivo fetal oximetry model, the in vivo fetal oximetry model having been trained using simulated light transmission data, fetal oximetry values corresponding to the simulated light transmission data, measured light transmission data, and measured fetal oximetry values corresponding to the measured light transmission data;
• and
• receiving, by the processor, an output from the in vivo fetal oximetry model, the output including an indication of an oximetry value for the fetus.