Types of Dopplers
Dopplers for home or hospital use differ in the following ways:
- Manufacturer: popular manufacturers are Nicolet, Huntleigh, Summit Doppler, EchoHeart, Ultrasound Technologies (Seward / Wakeling), Parks Medical Electronics (as Obstetrical Dopplers),and Sunray.
- Probe Type: waterproof or not. Waterproof probes are used for water births.
- Probe Frequency: 2-MHz or 3-MHz probes. Most practitioners can find the heart rate with either probe. A 3-MHz probe is recommended to detect a heart rate in early pregnancy (8–10 weeks gestation). A 2-MHz probe is recommended for pregnant women who are overweight. Newer 5-MHz transvaginal probes aids in the detection of fetal heart tones (FHT) early in pregnancy (6–8 weeks) and for patients who have a retroverted uterus or throughout pregnancy for FHT detection for women who are obese.
- Heart Rate Display: some Dopplers automatically display the heart rate on a built-in LCD; for others the fetal heart rate must be counted and timed by the practitioner.
The generic use of the word "Sonicaid" for Doppler fetal monitors comes from the products of the UK company Sonicaid Ltd. Sonicaid products included the D205/206 portable fetal Dopplers and FM2/3/4 series of fetal monitors. The company was acquired by Oxford Instruments in 1987 to form Oxford Sonicaid.
Read more about this topic: Doppler Fetal Monitor
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