Why did CDC pool (combine) individuals blood samples for measuring dioxins for the 2005 report?
For the 2001-2002 sampling years, the CDC strove to report levels above the limit of detection-that is, to report actual levels rather than reporting almost all “non-detects.” To do so, CDC needed larger volumes of blood than were collected in the 1999-2000 survey. This was done by: 1) increasing each individual blood sample volume from 5 to 8 milliliters and 2) making a very large sample-“pooled sample”-by combining a small amount of blood from many people. Larger blood samples permitted CDC to measure small amounts of dioxins, PCBs and brominated flame retardants.4 Pooled samples allow CDC to report average (mean) levels of chemicals in the U.S. population by age, race and gender. End Notes 1″Dioxins” refers to 7 dioxins and 10 furan chemical compounds. There are 210 total known chlorinated dioxins and furans, but only 17 of interest. 2Of the 17 dioxin compounds of interest, 15 were measured for the 2003 report, but all 17 were measured for the 2005 report. The two compounds added fo
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