Limit of Quantification
Just because we can tell something from noise does not mean that we can necessarily know how much of the material there actually is. The LOQ is the limit at which we can reasonably tell the difference between two different values. The LOQ is drastically different between labs so another detection limit is commonly used that is referred to as the Practical Quantitation Limit (PQL). The PQL is defined simply as about 5 times the MDL.
Read more about this topic: Detection Limit
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