It depends on laboratory policy. Some will keep it up to a week, others may discard it immediately after analysis. 48-72 hours is common in the US at least. Slides are usually retained for longer periods in the event review is required since they're small and can be stored at ambient conditions for decades. Note that refrigeration is the only option for whole blood (freezing would cause hemolysis of the sample) and far more typical for serum or plasma storage. It's important to remember that different componenents of blood will degrade at different rates, so contacting the performing laboratory in case additional or repeat testing is required is key.
Only one bottle they use ,but they get 7 bottles from me when they know that my blood is low.they said I need iron but get 7 bottles of blood from me when they only need 1 bottle for the test.where did the rest go? For blood donation !? 🙄
Blood collected for transfusion is never collected in these containers! Most containers are actually really small, only holding 5-7 mL (about a teaspoon) of whole blood. So 7 containers would be less than one sixteenth of the blood collected for transfusion! Some of those containers will only provide half of that volume since many components (glucose, potassium, sodium, cholesterol, etc.) are analyzed in serum. Different containers have specific preservatives that will behave differently. Light blue containers are used for coagulation testing, purple containers are used to preserve the cellular structures for analysis, yellow, red, and green containers are used for chemical (as well as microbiological or immunological) analysis, but each is different, and may not be used for all components. As an example, the green containers contain either sodium or lithium, which would obviously cause the lab to be unable to measure those analytes in that sample. Some containers may also be sent to reference laboratories for more specialized testing.
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