Laboratory methods

Blood Clots in Test Tubes: Preanalytical Errors

Why blood clots in test tubes before reaching the lab: causes of clot formation, impact on complete blood count, and preanalytical rules.

Illustration: a laboratory diagnostics specialist at a microscope
Illustration: a laboratory diagnostics specialist at a microscope

An anecdote:

God enters a laboratory and says to the lab assistant: — You’ve probably already unraveled all the secrets of creating life? Lab assistant: — What secrets! If only you had made blood that wouldn’t clot in a test tube before reaching the lab — there would be no questions at all!