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Are any sounds dangerous for pregnant women?

While noise can cause deafness in pregnant workers, it could also pose a danger to the foetus. During the last 3 months of pregnancy, the inner ear of the foetus is particularly sensitive. Noise of low frequencies (below 250 Hz) easily crosses the natural barriers that protect the foetus (abdominal and uterine walls, placenta and amniotic fluid) and is therefore potentially dangerous for the hearing of the unborn child.

The Audiolyser® ADL20 tests sounds from 125 to 8000Hz.