Why is it important to fill tubes containing anticoagulants to the correct amount?

Filling tubes containing anticoagulants to the correct amount is crucial because it ensures an accurate blood-additive ratio. Anticoagulants work by binding to specific components in the blood, and if the ratio of blood to anticoagulant is off, it can lead to either incomplete coagulation or excessive anticoagulation. This imbalance can affect the reliability of laboratory test results, potentially leading to misdiagnoses or inappropriate treatment plans.

For example, if there is too little anticoagulant, blood can clot in the tube before tests are performed, compromising the integrity of the sample. Conversely, too much anticoagulant can interfere with biochemical assays by diluting the blood components or altering results. Thus, maintaining the correct ratio is essential for achieving accurate and consistent laboratory outcomes.