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Threshold Screening Procedure for Qualitative Respirator Fit Testing by Dr McKay

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Dr Roy McKay

Dr Roy McKay

4 жыл бұрын

Qualitative Respirator Fit Testing with sweet or bitter taste solutions is conducted in two phases: Threshold Screening and Fit Testing. This video demonstrates the first phase (Threshold Screening) using the weak solution without the respirator to identify if the subject can detect the taste of the challenge agent, and if so, how many squeezes does it take. The results from this phase become the basis for the 2nd phase (Fit Testing).

Пікірлер: 3
@cesarallen7898
@cesarallen7898 4 жыл бұрын
Great Video Dr McKay. Supplies for saccharin powder fornreconstitution is still on backorder. Do you have any recommendations to prevent saccharin crystallizing. Some of our field personnel have been finding that their bottles are crystallizing. If the bottle is marked at the last meniscus line, (and none is lost externally from dripping falling out) can we reconstitute with distilled water to rehydrate the crystallized saccharin?
@drroymckay6845
@drroymckay6845 4 жыл бұрын
Regarding supplies of Saccharin solutions (both weak and strong), you can easily make your own. For step-by-step instructions, go to www.QualFit.net. At the top of the page is a tab called "Documents and Resources". Scroll down and you'll see instructions for preparing both weak and strong solutions for Sweet and Bitter fit test solutions. I assisted NIOSH and OSHA on these instructions, so I know they're correct. You may notice they differ from the instructions in the original OSHA Respirator Standard, but they are equivalent and easier to follow. Regarding the formation of crystals do NOT add water. Crystals commonly occur when the strong saccharin solution undergoes a temperature change or when there is evaporation (this is why crystals are often seen at the screw cap). You can try and gently warm the container to put them back into solution (make sure it's sealed tightly) or decant the liquid and place it in another clean container. The strong solution is a saturated solution, so the crystals have no affect. You don't want to add water, since this can decrease the concentration of the fit test solution, which could allow a poorly fitting respirator to pass. I hope this helps. Thanks for watching my video. A new video on the 2nd phase with the strong solution is coming out soon or watch my 1 hour comprehensive video. Roy
@gerardhughes
@gerardhughes 2 жыл бұрын
​@@drroymckay6845 Thanks for the reference to your fit testing solution instructions on your website. I've not attempted the instructions since USP saccharin sodium dihydrate is not as common or easy to purchase in small quantities as common food grade Sodium Saccharin (C7H4O3NSNa·2H2O), and because I'm not a chemist and don't understand the differences so I don't want to make any assumptions. Is it possible to safely make Saccharin fit and threshold solutions using regular food grade Sodium Saccharin? Your detailed instructions seem more complex than the formula alluded to in the OSHA standards, but also more detailed. Thanks
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