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Serum

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Within 20-60 minutes after a clot is formed in whole blood, the fluid that is exculded from the clot is the serum. For clinical tests, the clot that contains fibrin, blood cells, platelets and plasma is removed so that the serum can be tested.

Serum (Latin for "whey") may refer to:

  • Blood plasma, with clotting factors removed
  • Serous fluid, any clear bodily fluid
  • Truth serum, a general term for sedative drug or unspecified drug that is likely to make people tell truth or divulge information
  • Medication, derived from an animal's blood or serous fluid, often involving:
    • Antibody, protein used by the immune system to identify and neutralize foreign objects like bacteria and viruses
    • Antivenom, biological product used in the treatment of venomous bites or stings
    • Antiviral drug, used specifically for treating viral infections
    • Antidote, substance which can counteract a form of poisoning