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Which measurement does a clinical laboratory typically use flame photometry for?

  • A.Iron and copper in tissue
  • B.Mercury in urine samples
  • C.Sodium and potassium in serum
  • D.Lead and cadmium in blood

Answer: C

Sodium and potassium are present at millimolar levels and are exactly the elements flame emission handles best, which is why the technique persisted in clinical use. Lead and cadmium need a furnace, iron and copper are usually done by absorption, and mercury by cold vapour. Matching a technique to the concentration and the element together is what puts each measurement on the right instrument.

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