The Full form of FHR
FHR Full Form – The full form of FHR is Fetal Heart Rate which can be defined as the number of times the heart of the fetus beats in a minute. For the FHR to be accurately verified, the fetus has to be in a non-stressed condition, reflecting the cardio-accelerator and cardio-decelerator reflexes. FHR is measured sonographically. A normal FHR is when it ranges between 120 and 160 beats per minute (bpm) during the in utero period. This normal count, however, varies during the gestation period, increasing to 170 beats per minute at 10 weeks and decreasing to 130 beats per minute at term.
Even though myocardium contracts rhythmically by 3 weeks after conception, it is only possible to properly notice the FHR around 6 weeks, with the help of an Ultrasound Doppler, during which it ranges between 100 and 120 beats per minute.
The chart below shows the varying ranges of the FHR, according to the different stages of pregnancy, predicting the fetus’ health.
| Growth of the Fetus | Normal FHR (bpm) |
| Embryo – 2 mm | 75 |
| Embryo – 5 mm | 100 |
| Embryo – 10 mm | 120 |
| Embryo – 15 mm | 130 |
| Beginning of 5th Week | 80-85 |
| On-going of 5th Week | Initiates at 80 up to 103 |
| Gestational 6 Weeks | Initiates at 103 up to 126 |
| Gestational 7 Weeks | Initiates at 126 up to 149 |
| Gestational 8 Weeks | Initiates at 149 up to 172 |
| Gestational 9 Weeks | 155-195 (average 175) |
| 12 Weeks (Ending of the first trimester) | 120-180 (average 150) |
| After 12 Weeks (Rest of pregnancy) | 120-160 (average 140) |
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