CTG or Cardiotocography paper is the specialized thermal paper used in CTG machines to record fetal heart rate and uterine contractions during pregnancy. It provides a visual record of the fetal heart rates and the uterine contractions. It is also available in various sizes to fit different CTG machines. 

The CTG paper serves as a permanent record of the fetal heart rate and uterine contractions during labor. This documented information can be used for communication between healthcare providers involved in the birthing process and can be included in the mother’s medical records.

During pregnancy, a CTG machine monitors the fetal heart rate (FHR) and uterine contractions. The CTG paper records these measurements simultaneously, providing a visual representation of the baby’s well-being.

The CTG paper displays the FHR as a wavy line. The healthcare professional can assess the baseline heart rate, variability (fluctuations in the FHR), and the presence of accelerations and decelerations in the heartbeat.