Order Of Draw - Ccma
- What is the correct order of draw for these tubes: blood cultures, SST, light blue, lavender?
- Blood cultures → light blue → SST → lavender. Starting with cultures for sterility, then coagulation, serum, and EDTA adheres to CLSI to prevent additive carryover issues.
- Which venipuncture supply is used to reduce hemolysis risk when drawing fragile veins?
- Butterfly (winged infusion) set. Butterfly sets allow controlled, low-pressure draws, minimizing vein trauma and red cell rupture in delicate vessels.
- Which tube is collected first when no blood cultures are ordered and only standard tubes are drawn?
- Light blue (sodium citrate). Light blue tubes for coagulation tests are drawn early to avoid interference from clot activators or anticoagulants in later tubes.
- Which tube additive is most associated with interfering with calcium results if carried over?
- EDTA. EDTA chelates calcium ions, potentially falsifying calcium measurements if trace amounts carry over to serum or plasma tubes.
- Which tube is collected first in the CLSI order of draw when blood cultures are ordered?
- Blood culture bottles or sterile yellow SPS tube. Blood cultures require sterile collection first to prevent microbial contamination from other tube additives or skin flora.
- Identify the additive in a gray top tube and the main test category it commonly supports.
- Fluoride/oxalate; glucose and lactate testing. Fluoride inhibits glycolysis and oxalate anticoagulates, preserving glucose levels for accurate metabolic testing over time.
- Which tubes are considered serum tubes in the order of draw immediately after light blue?
- Red (serum) and gold/tiger (SST). Serum tubes are collected after coagulation tubes to prevent citrate from affecting clotting or chemistry results.
- What is the correct CLSI order of draw after blood cultures and before serum tubes?
- Light blue (sodium citrate). Citrate tubes follow cultures to preserve coagulation factors without contamination from subsequent additives like heparin or EDTA.
- Which tube is drawn last in the standard order of draw for venipuncture?
- Gray (fluoride/oxalate). Gray tubes are last to avoid potassium oxalate or sodium fluoride contaminating previous tubes and altering electrolyte or glucose results.
- Which tube comes immediately after green (heparin) in the standard venipuncture order of draw?
- Lavender or pink (EDTA). EDTA tubes follow heparin to prevent EDTA from chelating calcium and interfering with coagulation or chemistry in earlier tubes.
- Which tube color is commonly used for blood bank testing, and what is its additive?
- Pink; EDTA. Pink tubes with EDTA are designed for blood typing and crossmatching, ensuring compatibility and minimal hemolysis in transfusion medicine.
- Which needle gauge is most commonly used for routine adult venipuncture?
- 21- or 22-gauge multisample needle. These gauges balance efficient blood flow with reduced hemolysis risk, suitable for most adult veins in standard collections.
- Which tube color is most appropriate for a fasting glucose specimen?
- Gray. Gray tubes with fluoride/oxalate inhibit glycolysis, ensuring stable glucose levels for fasting measurements without degradation.
- Identify the additive in a lavender top tube and the main test category it commonly supports.
- EDTA; hematology testing (for example, CBC). EDTA preserves cell morphology by chelating calcium, essential for accurate blood cell counts and differentials in hematology.
- Which tube color is most appropriate for a prothrombin time or INR specimen?
- Light blue. Sodium citrate maintains the proper blood-to-additive ratio for reliable coagulation studies like PT and INR.
- Which device should be selected to collect blood from an indwelling IV catheter line?
- Syringe or evacuated tube system per facility policy. Facility policies dictate the method to ensure safe, contamination-free collection from lines while complying with standards.
- What is the correct order of draw for these tubes: light blue, SST, lavender, gray?
- Light blue → SST → lavender → gray. The sequence follows CLSI guidelines: coagulation before serum, then EDTA, then fluoride to minimize additive cross-contamination.
- Identify the additive in a green top tube and the main test category it commonly supports.
- Heparin; plasma chemistry testing. Heparin inhibits thrombin to provide plasma quickly, supporting urgent chemistry panels without clotting interference.
- Which tube comes immediately after serum tubes (red, gold, SST) in the standard order of draw?
- Green (heparin). Heparin tubes for plasma are drawn after serum to avoid heparin contamination that could inhibit clotting in prior tubes.
- What is the correct order of draw for these tubes: blood cultures, green, lavender, gray?
- Blood cultures → green → lavender → gray. Cultures are first for sterility, followed by heparin, EDTA, and fluoride per CLSI to prevent interference among plasma tubes.
- Which tube color is most appropriate for a complete blood count specimen?
- Lavender. EDTA in lavender tubes prevents clotting and preserves cell integrity for comprehensive hematology analysis including cell counts.
- What is the primary purpose of the order of draw in venipuncture specimen collection?
- Prevent additive carryover and specimen contamination. Following a specific sequence minimizes the risk of additives from one tube contaminating another, ensuring accurate test results.
- What is the correct order of draw for these tubes: light blue, green, SST, gray?
- Light blue → SST → green → gray. CLSI order prioritizes coagulation, then serum, heparin, and fluoride to avoid citrate or heparin affecting subsequent tests.
- Identify the additive in a light blue top tube and the main test category it supports.
- Sodium citrate; coagulation testing. Sodium citrate prevents clotting by binding calcium, making light blue tubes ideal for tests like PT/INR that assess coagulation pathways.