Spirometry is the most common lung function test. It measures how much and how quickly you can move air out of your lungs. You breathe into a mouthpiece attached to a machine called a spirometer. The machine records your results.
Confirming the presence of your babyâs heartbeat. You may have gone to your doctor with vaginal bleeding or you may be anxious because of problems in a previous pregnancy (such as miscarriage). This ultrasound can routinely detect a heartbeat in your baby as early as 6-7 weeks.
Additionally, a traditional stethoscope can be placed on the mother's belly to listen to the baby's heartbeat. The Timeline. Each of these techniques reveal the baby's heartbeat at different times: Vaginal ultrasound-- A vaginal ultrasound can show the baby's fluttering heart onscreen and play a simulated recording of the heartbeat as early as 5 to 6 weeks gestation. Abdominal ultrasound-- An abdominal ultrasound can pick up the baby's heartbeat during weeks 7 and 8. Doppler-- A Doppler can detect the heartbeat at the end of the first trimester and beginning of the second trimester, around 12 to 14 weeks. Stethoscope-- Health care providers can use a stethoscope to detect the baby's heartbeat starting at week 22. Factors Influencing Hearing Heartbeat. In some situations, hearing the baby's heartbeat may be challenging.