===== Echo-based PH Screen =====

^TR velocity^Echo Signs of PH^PH Probability^
|<2.8 m/s or undetectable|No|Low|
|<2.8 m/s or undetectable|Yes|Intermediate|
|2.8 to 3.4 m/s|No|Intermediate|
|2.8 to 3.4 m/s|Yes|High|
|>3.4 m/s|Any|High|

==== Echo Signs of PH ====