The invention provides a pulse oximetry sensor for attachment to the lower half of the palm or the ulnar edge of the palm. The sensor may be portable, untethered and in some instances, disposable. The features of the sensor make it effective in stable, chronic or emergency medical settings.本發明提供一種用於附接至手掌下半部或手掌尺骨邊緣之脈搏血氧測定感測器。該感測器可為可攜式的、未拴系的,且在一些情況下係拋棄式的。該感測器之特徵使得其在穩定醫療環境、慢性醫療環境或緊急醫療環境中有效。