{
  "$type": "site.standard.document",
  "bskyPostRef": {
    "cid": "bafyreidmyvqqtvo7ngqlx6jtevjzlcfjxn3ihyymnzvtvl774hjh7l7ti4",
    "uri": "at://did:plc:ymc4gnswuis3jispcsmozvs2/app.bsky.feed.post/3mmaqjpt62gp2"
  },
  "coverImage": {
    "$type": "blob",
    "ref": {
      "$link": "bafkreifenf2sc5hav7kznfcsnb2yvcm4chilho6fl4jqg6x2we77jwgs3q"
    },
    "mimeType": "image/jpeg",
    "size": 3004770
  },
  "path": "/2026/05/19/how-pulse-oximetry-figures-out-your-blood-oxygen-levels/",
  "publishedAt": "2026-05-19T17:00:07.000Z",
  "site": "https://hackaday.com",
  "tags": [
    "Hackaday Columns",
    "Medical Hacks",
    "blood",
    "heart",
    "medical hacks",
    "medicine",
    "oxygen saturation",
    "pulse oximeter",
    "Pulse oximetry",
    "pulse rate",
    "…read more"
  ],
  "textContent": "If you’ve ever had a medical team investigating cardiac issues, you’ve probably had a bunch of electrodes stuck all over your chest and been hooked up to an electrocardiogram. This …read more",
  "title": "How Pulse Oximetry Figures Out Your Blood Oxygen Levels"
}