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A Cytogenetics paper requisition must be completed. If specimen is to be delivered directly to hospital laboratory, it must be put on wet ice immediately after collection and delivered within 20 minutes. Sampling time is the end of the work week for industrial exposure monitoring.
Metals with timing "end of work week" (meaning four or five consecutive working days with exposure) are eliminated with half-lives longer than five hours.
Blood should be collected in a blue-top tube containing 3.2% buffered sodium citrate.
Such metals accumulate in the body during the work week; therefore, their timing is critical in relation to previous exposures.
Optional protocol: Instruct the patient to void at 8 AM and discard the specimen. Collect adequate number of tubes to obtain the required specimen volume.
A discard tube is not required prior to collection of coagulation samples, except when using a winged blood collection device (i.e., "butterfly"), in which case a discard tube should be used.
When non citrate tubes are collected for other tests, collect sterile and non additive (red-top) tubes prior to citrate (blue-top) tubes.