Which clients? All of them during the initial assessment. I use either the manual method or my Omron machine using the appropriate cuff size. If the reading is more than 140/90 on either value, it’s back to the doc. If it is below but close I re-check to see a trend. If it stays close, I usually ask the client to bring it up next time they see their doctor.
If a client has uncontrolled high blood pressure, I will not train him or her. If it is controlled I ask the doctor for parameters for training. Medications usually need to be considered.