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Mary, different clinics run different tests. Most will produce an FVC (forced vital capacity, how much air you can exhale after a deep breath, so sort of testing inhalation and exhalation at the same time) and/or MIP (maximum inspiratory pressure) from time to time as these are the Medicare measures for whether a BiPAP/noninvasive ventilator will be reimbursed (<50% and <60cm, respectively). Studies suggest that SNIF/SNIP (the pressure someone generates by breathing in through their nose) is a good idea in ALS, because it does not require a mouthpiece seal and tests a somewhat different set of muscles, but not everyone is on board as yet.
As Tillie notes, what P/CALS do for self-care isn't about numbers as much as how thing are going functionally, just that in the States, we do have to pay attention to certain numbers long enough to get a BiPAP reimbursed (the kind that are plugged in can be had below the $1000 threshold, but the bigger kind that have batteries, aka Trilogy or Astral, are far more). However, I always note that any doc can write a BiPAP without numerical thresholds being met, if reimbursement is not an issue.
It does not actually require a pulmonologist to order respiratory tests like these -- the neurologist at the clinic can do it, or outside the clinic, another doc. Nor is it required that it be a pulmo that orders the machine, since not all PALS have ready to access to one, so long as the justification is there.
As Tillie notes, what P/CALS do for self-care isn't about numbers as much as how thing are going functionally, just that in the States, we do have to pay attention to certain numbers long enough to get a BiPAP reimbursed (the kind that are plugged in can be had below the $1000 threshold, but the bigger kind that have batteries, aka Trilogy or Astral, are far more). However, I always note that any doc can write a BiPAP without numerical thresholds being met, if reimbursement is not an issue.
It does not actually require a pulmonologist to order respiratory tests like these -- the neurologist at the clinic can do it, or outside the clinic, another doc. Nor is it required that it be a pulmo that orders the machine, since not all PALS have ready to access to one, so long as the justification is there.