Lab to lab variability is unfortunate but no amount of money or regulation is likely to help. Its just inherent at the current state of the technology. If you have your own GC or HPLC you can probably be accurate within ±10% on any given day with just one sample injected. If you inject 2-3 samples you can take the average and be closer to the truth, but that takes extra time the 3rd party lab can’t afford at the price they charge. If you have your own in-house GC or HPLC then you can decide to run 2-3 samples to be sure.
Hugh Goldsmith
SRI
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