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ters. The entire screening and testing procedure to fully expand.
shall be explained to the test subject prior to the
conduct of the screening test. (7) An initial ten squeezes are repeated rap-
idly and then the test subject is asked
(a) Taste Threshold Screening. whether the Bitrex can be tasted. If the test
subject reports tasting the bitter taste during
The Bitrex taste threshold screening, per- the ten squeezes, the screening test is com-
formed without wearing a respirator, is in- pleted. The taste threshold is noted as ten re-
tended to determine whether the individual gardless of the number of squeezes actually
being tested can detect the taste of Bitrex. completed.
(1) During threshold screening as well as dur- (8) If the first response is negative, ten more
ing fit testing, subjects shall wear an enclosure squeezes are repeated rapidly and the test
about the head and shoulders that is approxi- subject is again asked whether the Bitrex is
mately 12 inches (30.5 cm) in diameter by 14 tasted. If the test subject reports tasting the
inches (35.6 cm) tall. The front portion of the bitter taste during the second ten squeezes,
enclosure shall be clear from the respirator and the screening test is completed. The taste
allow free movement of the head when a respi- threshold is noted as twenty regardless of
rator is worn. An enclosure substantially simi- the number of squeezes actually completed.
lar to the 3M hood assembly, parts # FT 14
and # FT 15 combined, is adequate. (9) If the second response is negative, ten
more squeezes are repeated rapidly and the
(2) The test enclosure shall have a 3/4 inch (1.9 test subject is again asked whether the Bitrex
cm) hole in front of the test subject’s nose and is tasted. If the test subject reports tasting the
mouth area to accommodate the nebulizer bitter taste during the third set of ten
nozzle. squeezes, the screening test is completed.
The taste threshold is noted as thirty regard-
(3) The test subject shall don the test enclosure. less of the number of squeezes actually com-
Throughout the threshold screening test, the pleted.
test subject shall breathe through his or her
slightly open mouth with tongue extended. (10) The test conductor will take note of the
The subject is instructed to report when he/she number of squeezes required to solicit a
detects a bitter taste. taste response.
(4) Using a DeVilbiss Model 40 Inhalation (11) If the Bitrex is not tasted after 30
Medication Nebulizer or equivalent, the test squeezes (step 10), the test subject is unable
conductor shall spray the Threshold Check So- to taste Bitrex and may not perform the
lution into the enclosure. This Nebulizer shall Bitrex fit test.
be clearly marked to distinguish it from the fit
test solution nebulizer. (12) If a taste response is elicited, the test
subject shall be asked to take note of the
(5) The Threshold Check Solution is prepared taste for reference in the fit test.
by adding 13.5 milligrams of Bitrex to 100 ml
of 5% salt (NaCl) solution in distilled water. (13) Correct use of the nebulizer means that
approximately 1 ml of liquid is used at a
(6) To produce the aerosol, the nebulizer bulb time in the nebulizer body.
is firmly squeezed so that the bulb collapses
completely, and is then released and allowed (14) The nebulizer shall be thoroughly
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