Which of the following represents the correct order of tests: APTT, CBC, ESR, BCX, LYTES, CMP?

The correct order for the tests is based on the specific protocols and guidelines for venipuncture and laboratory processing. When collecting multiple tubes of blood, it is important to prioritize the order of draws to minimize cross-contamination and ensure accurate test results.

In this context, the priority starts with blood cultures (BCX) because contamination must be avoided for accurate microbial diagnosis. Following that, the APTT (Activated Partial Thromboplastin Time) test is performed, which is sensitive to contamination by other tube additives. Afterward, the Clinical Chemistry tests such as CMP (Comprehensive Metabolic Panel) and LYTES (Lytes or Electrolytes) are typically drawn next. Lastly, the CBC (Complete Blood Count) can be drawn since the anticoagulant used for this test is less likely to affect the previous tests. Finally, ESR (Erythrocyte Sedimentation Rate) is usually the last test to be drawn because it is collected in a manner that is least affected by other additives.

This order ensures that each test is performed with the highest integrity of the sample, preserving the accuracy of results by following the principles of venipuncture order of draws according to standard practice in phlebotomy.