<p>An anticoagulant solution of sodium citrate for use in blood chemistry-related techniques and apparatus is disclosed. The anticoagulant solution should include an effective concentration of sodium citrate sufficient for preventing the coagulation of a sample of blood employed in the technique or added to the apparatus. The sodium citrate-based anticoagulant solution should have a pH ranging from above 6.0 to about 8.5 and a sodium citrate concentration preferably ranging from about 0.05M to about 0.2M.</p>