What may happen if blood collected without an additive is centrifuged before it has completely clotted?

If blood collected without an additive is centrifuged before it has completely clotted, the resulting serum may be contaminated with fibrinogen and other clotting factors. This can lead to inaccurate laboratory test results, particularly for tests that require serum free of clotting components. Additionally, premature centrifugation can cause hemolysis of red blood cells, further complicating analysis and interpretation. Proper clotting time is crucial to ensure the accuracy and reliability of blood test outcomes.