Analytical chemistry has been in the medical laboratory for many years, and although it is now an enormously fundamental technique in the lab these days, it had humble beginnings. Reagents were blended with either whole human blood, or the blood was allowed to clot in a test tube and then centrifuged, allowing the red cells to split from the serum. The serum was combined with the specialised reagents and allowed to incubate at body temperature, customarily in a water bath, till a reaction took place.
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