For most of the chemistry methods, the holding time criteria generally refer to the length of time that a properly preserved sample can be held at a specific temperature (e.g., 4 oC) and that usually means the time/temperature criteria when the samples reach the laboratory. So it’s not really talking about the time involved with collecting and shipping the sample.
Are hold times meant to be to the minute of collection or day of collection? For example, for a 14 day holding time, would a sample collected at 10:30 expire at 10:30 on day 14 or at 23:59 on day 14?
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