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What is the reason for turbid serum?

Serum turbidity is usually caused by cryoprecipitation of lipid components during freezing and thawing. The more times the serum is subjected to freeze/thaw cycles, the more turbidity is noticed.

It can be minimized by freezing the serum in aliquots at -20°C and thawing these aliquots individually at the time of use.

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