National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ Mycobacterium tuberculosis is considered present in the sample if the absorbance of the unknown sample is equal to or greater than 0.35 absorbance units. A sample yielding an absorbance value less than 0.35 absorbance units is considered negative for Mycobacterium tuberculosis. ”
National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ Place each filter cassette into a sample bag for transport (one sampler/bag) . SAMPLING: Calibrate each pump with a representative filter cassette in line. Sample closed-face at a flow rate of 4 L/min or greater. The sampling time period depends on the suspected concentration. If the concentration is unknown, sample for long time periods (hours) . NOTE:If the airborne particle concentration is unknown, assume the particles are present at a low concentration. Reinsert cassette plugs, place each filter cassette in a sample bag (one cassette/bag) , and pack securely for shipment. ”
National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ Sample bags, size 10.2 × 15.2 cm. SPECIAL PRECAUTIONS: Entering rooms contaminated with airborne TB is a health risk. Appropriate respiratory protection should be worn [6] . Filter samples should be opened in a biosafety cabinet. Once the samples are heated for the specified time period, there is little risk to the laboratory worker conducting the analysis. The TB PCR method is extremely sensitive. Therefore, segregation of the various laboratory activities is essential in order to prevent the generation of false positives. ”
