Hydrosonography Test
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Question
We were sent to undergo a hydrosonography test. Does this render us impure?
Answer
Hello and Happy Hanukkah
This is an ultrasound test in which physiological saline is injected into the uterine cavity.
According to Halacha, if the tube inserted into the cervix is less than 4 mm wide, even if a small amount of blood is discharged, it is pure.
If the tube is wider, or a large amount of blood is discharged, it is impure.
Source
According to the instructions of the Gaon, Rabbi Avraham Fried, shlita