The correct order starts with blood gas tubes, followed immediately by EDTA tubes—a critical sequence distinct from the standard venipuncture protocol. Capillary microcollection draws this way because skin puncture blood coagulates rapidly, triggering platelet activation and micro-clot formation. Placing EDTA tubes early preserves cellular integrity for accurate hematology and CBC results, something not required in the slower-paced evacuated tube environment.
Core Takeaway: Capillary collection flips the logic. Instead of avoiding additive cross-contamination, the primary battle is against instant clotting. Drawing EDTA immediately after blood gas tubes is the only way to safeguard platelet counts and cell morphology when every microliter counts.
Summary Table:
| Sampling Aspect | Capillary Microcollection | Venous Evacuated Tubes |
|---|---|---|
| First Priority Tube | Blood Gas / EDTA | Blood Culture / Sodium Citrate |
| EDTA Timing | 2nd (Immediately after Blood Gas) | 5th (Late in sequence) |
| Primary Threat | Instant platelet activation & clotting | Chemical cross-contamination |
| Primary Goal | Preserve cell morphology & accurate CBC | Maintain correct additive-to-blood ratios |
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