Why can’t a single blood test show you all the information you need instead of having to take multiple tests for different markers?
In: Biology
A lot of blood tests needs the sample to be prepared in a specific way. All blood needs preparation in some way to avoid it coagulating in the test tube. But this might damage some of the things they are looking for. If you pay attention the next time you get your blood drawn you may notice that the test tubes they use are not completely empty but have a tiny droplet of something in them. This is what gets mixed with the blood as it is drawn. And different tests need different things to prepare the blood sample.
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