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Phlebotomy Procedure: Step-by-Step Guide for Safe Blood Collection

Phlebotomy: Venous Blood Draw — Standard Protocol

Phlebotomy is the percutaneous puncture of a vein to collect blood for diagnostic testing, donation, or therapeutic removal. Performed by phlebotomists, nurses, or trained clinical staff.

Equipment

  • Evacuated tube system (holder, needles 21–23G, tubes per test order)
  • Tourniquet (latex-free)
  • Antiseptic: 70% isopropyl alcohol + 2% chlorhexidine (or per facility)
  • Gauze, adhesive bandage, sharps container
  • PPE: gloves, face protection if splash risk
  • Patient labels, requisition

Step-by-Step Procedure

  1. Identify Patient: Two identifiers (name, DOB, MRN). Verify test orders, fasting status.
  2. Position & Prepare: Seated or supine; arm extended, supported, palm up.
  3. Select Vein: Median cubital (first choice), cephalic, basilic. Palpate for resilience, size, direction.
  4. Apply Tourniquet: 3–4 inches above site; tight enough to occlude venous return, not arterial. Max 1 minute.
  5. Cleanse Site: Concentric circles outward (2-inch diameter); allow 30 sec dry. Do not repalpate after cleaning.
  6. Anchor Vein: Thumb below site, pulling skin taut.
  7. Insert Needle: Bevel up, 15–30° angle; advance smoothly into lumen. Flashback confirms entry.
  8. Fill Tubes in Correct Order: (Blood culture → citrate → serum → heparin → EDTA → glycolytic inhibitor). Invert each gently 5–8×.
  9. Release Tourniquet before last tube fills.
  10. Remove Needle: Activate safety device; apply immediate pressure with gauze.
  11. Secure Site: Bandage after bleeding stops (1–2 min).
  12. Label Tubes at Bedside: Patient ID, date, time, collector initials.
  13. Dispose Sharps; Transport Specimens Promptly.

    14. Post-Procedure Care

    • Observe for hematoma, nerve injury, prolonged bleeding.
    • Advise patient: keep bandage 15–30 min; avoid heavy lifting 1h; hydrate.

    Common Complications & Mitigation

    Complication Prevention / Management
    Hematoma Release tourniquet before needle removal; firm pressure; avoid probing
    Vasovagal Syncope Supine position; recognize prodrome (pallor, nausea); cool compress
    Nerve Injury Anatomical knowledge; avoid basilic vein medial to brachial artery
    Hemolysis Correct needle gauge; avoid excessive force; proper tube fill/order

    Competent, compassionate phlebotomy minimizes patient anxiety and ensures specimen integrity.

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