Phlebotomy Test Pediatric Blood Collection 2 — Questions and Answers

Question 1: A toddler requires venipuncture but is extremely uncooperative. Which approach is BEST?

Restrain the child completely without explanation to complete the draw quickly
Involve the parent in positioning and comforting while a second person assists in immobilization as needed (Correct answer)
Reschedule the collection for another day when the child may be calmer
Attempt the draw up to 5 times until successful

Correct answer: Involve the parent in positioning and comforting while a second person assists in immobilization as needed

Involving the parent for comfort and having a trained assistant for safe immobilization is the recommended approach, minimizing trauma while safely completing the collection.

Managing an uncooperative toddler during venipuncture requires a team approach: (1) Parent involvement — research consistently shows that a calm, involved parent reduces child anxiety more than exclusion; position the child in the parent's lap in a hug position (child facing parent with arms wrapped around the parent) or have the parent hold the child's free arm and provide verbal comfort; (2) Trained second assistant — a second phlebotomist or nurse can gently but securely hold the arm and prevent dangerous movement that could cause needle injury; (3) Distraction and comfort measures; (4) CLSI guidelines recommend no more than 2 venipuncture attempts by one phlebotomist—if unsuccessful after 2 attempts, another experienced phlebotomist should try or escalate to physician; (5) Never attempt 5 times—excessive attempts increase trauma, pain, and hematoma formation.

Question 2: Microtainer tubes are color-coded the same as adult venipuncture tubes. Which Microtainer tube would be used for a neonatal chemistry panel (BMP)?

Lavender (EDTA)
Green (lithium heparin)
Gold (serum separator with clot activator) (Correct answer)
Gray (sodium fluoride)

Correct answer: Gold (serum separator with clot activator)

Gold-top Microtainer tubes (serum separator with clot activator) are used for chemistry panels, just as gold/SST tubes are used in adult venipuncture for chemistry testing.

For a basic metabolic panel (BMP), which includes electrolytes (Na, K, Cl, CO2), glucose, BUN, creatinine, and calcium, serum or lithium heparin plasma is the standard specimen type. In micro-collection, the gold-top Microtainer tube contains a clot activator (to promote complete clotting) and serum separator gel (to separate serum after centrifugation), providing serum for chemistry analyzers. Green-top (lithium heparin) Microtainer tubes provide plasma and are an acceptable alternative for many chemistry tests with faster turnaround (no clotting time needed). Lavender is for CBC, gray is for glucose specifically, and light blue is for coagulation studies. In practice, many NICUs use lithium heparin (green) Microtainer tubes for chemistry to minimize specimen volume needs and speed up results.

Question 3: What does 'iatrogenic anemia' mean in the context of neonatal blood collection?

Anemia caused by hemolytic disease of the newborn
Anemia resulting from excessive blood removal by medical testing (Correct answer)
Congenital anemia present at birth
Anemia secondary to inadequate iron supplementation

Correct answer: Anemia resulting from excessive blood removal by medical testing

Iatrogenic anemia in neonates refers to anemia directly caused by repeated blood draws for laboratory testing, which removes significant blood volume from their small total blood volume.

Iatrogenic anemia (also called 'laboratory-related anemia' or 'phlebotomy-related anemia') is a well-documented problem in neonatal and pediatric intensive care. Neonates have a total blood volume of approximately 85–90 mL/kg. Critically ill neonates often require multiple daily blood tests (blood gases, electrolytes, CBC, cultures), and cumulative blood losses from testing can be substantial relative to their total volume. For example, a 1 kg premature neonate has only ~85 mL of blood; losing 5–10 mL per day for laboratory testing (without replacement) can produce significant anemia requiring blood transfusion within days. Strategies to minimize iatrogenic anemia include: (1) Using micro-collection techniques and micro-sample analyzers; (2) Bundling tests to minimize collection episodes; (3) Tracking cumulative blood draw volumes; (4) Using POCT to reduce sample volumes.

Question 4: When a pediatric patient has difficult veins, which site is acceptable for venipuncture in children under 12 months?

Femoral vein (performed by phlebotomist if veins are difficult)
Scalp veins (superficial temporal or frontal veins) (Correct answer)
Antecubital fossa, which is always the first choice in infants
Fingertip veins using a butterfly needle

Correct answer: Scalp veins (superficial temporal or frontal veins)

Scalp veins are used in neonates and young infants when peripheral limb veins are inaccessible, as they are visible and well-supported for needle access.

In neonates and infants under 12 months, when peripheral limb veins (dorsal hand, antecubital, saphenous) are inaccessible, scalp veins are a viable alternative. The temporal and frontal scalp veins are often visible through the thin, sparsely haired skin of young infants. Technique: a small area of hair may be shaved, scalp vein needle (butterfly) inserted in the direction of blood flow (toward the heart), and a rubber band tourniquet may be placed around the head proximally. The parent must be informed, as it is understandably alarming to place a needle in a baby's scalp. Disadvantages: the scalp veins can look like scalp arteries (if blood pulses, it is arterial—remove immediately); post-procedure bruising is visible; not appropriate for older infants/children. Femoral vein access in infants is a physician-performed procedure due to proximity to the femoral artery and nerve.

Question 5: A phlebotomist observes petechiae on a child's arm after applying a tourniquet. This finding suggests:

Normal tourniquet-related skin color change
Possible thrombocytopenia (low platelet count) or capillary fragility (Correct answer)
The tourniquet was applied correctly and hemostasis is good
The child has an allergy to latex

Correct answer: Possible thrombocytopenia (low platelet count) or capillary fragility

Petechiae (tiny red/purple pinpoint hemorrhages) appearing under a tourniquet indicate thrombocytopenia or capillary fragility—this is a clinically significant unexpected finding.

Petechiae are tiny, flat, non-blanching red or purple spots (1–3 mm) caused by small capillary hemorrhages. The appearance of petechiae at a tourniquet site (or elsewhere) during a blood draw is a clinically significant unexpected finding. Normal skin under tourniquet pressure does not develop petechiae. Causes of petechiae with tourniquet use include: (1) Thrombocytopenia (low platelet count) — platelets are responsible for primary hemostasis at capillary level; with insufficient platelets, capillaries bleed into skin under increased venous pressure from tourniquet; (2) Platelet dysfunction (thrombocytopathy); (3) Vasculitis or capillary fragility; (4) Coagulation factor deficiencies (less commonly cause petechiae specifically). The phlebotomist should note this finding, release the tourniquet promptly, complete the collection, and report the observation to the ordering physician or nursing staff—it may be a key diagnostic finding.

Question 6: The saphenous vein is used as a venipuncture site primarily in which pediatric patient?

Adolescents as an alternative to antecubital veins
Infants when limb veins are inaccessible and scalp veins are not appropriate (Correct answer)
School-age children as the first-choice site
Neonates when heelstick volume is insufficient

Correct answer: Infants when limb veins are inaccessible and scalp veins are not appropriate

The great saphenous vein at the ankle/foot is used in infants when other peripheral sites are exhausted, providing a large, consistently located vein accessible for venipuncture.

The great saphenous vein runs along the medial aspect of the leg and foot and is one of the most consistently located superficial veins in the body. In pediatric patients (especially infants), when upper extremity veins (dorsal hand, antecubital) and scalp veins are inaccessible or exhausted, the saphenous vein at the ankle (just anterior to the medial malleolus) or along the medial leg is a reliable alternative. It is generally not a first-choice site because: (1) The leg should ideally be spared for IV access and walking; (2) Inferior vena cava-related clotting risk is higher for lower extremity sites; (3) It requires the infant to be properly positioned. In neonatal ICU settings, saphenous venipuncture is performed by nurses or phlebotomists when other sites are truly exhausted. This site is rarely used in older children who can cooperate with antecubital access.

Question 7: A blood specimen is required from a 4-year-old child who has a port-a-cath (implanted venous access device). Who is authorized to access the port for blood collection?

Any phlebotomist trained in standard venipuncture
Only nurses or other clinicians specifically trained and credentialed in central venous access device management (Correct answer)
The parent, who has been trained at home
The child's primary care physician only

Correct answer: Only nurses or other clinicians specifically trained and credentialed in central venous access device management

Accessing implanted ports requires specific training in sterile technique, flush protocols, and complication management; only specially credentialed nurses or clinicians should perform this procedure.

Implanted venous access devices (ports, port-a-caths) are surgically placed subcutaneous chambers connected to a central venous catheter. They are used in children requiring long-term venous access (cancer chemotherapy, total parenteral nutrition, frequent blood draws). Accessing these devices requires: (1) Strict sterile technique using non-coring (Huber) needles; (2) Specific flush protocols (heparin locking) to maintain patency; (3) Knowledge of complications (infection, thrombosis, port malfunction); (4) Institutional credentialing/competency verification. Standard phlebotomists are not trained or credentialed for central venous access device management. This is within the scope of practice of trained oncology nurses, IV therapy nurses, or other specifically credentialed clinicians. Improper access technique can cause catheter-associated bloodstream infections (a serious complication), air embolism, or port damage.

Question 8: Which of the following practices helps to MINIMIZE hemolysis in pediatric capillary blood specimens?

Using a larger gauge lancet for better blood flow
Allowing the site to warm, avoiding excessive squeezing, and using the correct tube (Correct answer)
Collecting the specimen quickly and capping tubes immediately
Mixing tubes by vigorous shaking after collection

Correct answer: Allowing the site to warm, avoiding excessive squeezing, and using the correct tube

Warming increases blood flow (reducing squeezing), proper technique prevents tissue fluid contamination, and correct tubes prevent osmotic lysis—all reduce hemolysis.

Hemolysis in capillary specimens is a common pre-analytical problem that can falsely elevate potassium, LDH, AST, phosphorus, and other intracellular analytes. Prevention strategies: (1) Warm the site for 3–5 minutes before puncture to increase blood flow, reducing the need for squeezing that mechanically lyses cells; (2) Use the correct lancet depth and gauge—too deep causes more tissue trauma; (3) Wipe away the first drop (tissue fluid and initial trauma products); (4) Avoid excessive squeezing (milking)—the most common cause of hemolysis; (5) Allow blood to flow freely by gravity into Microtainer tubes—don't scrape the tube against the skin; (6) Ensure isopropyl alcohol is completely dry before puncture (residual alcohol lyses RBCs); (7) Mix tubes by gentle inversion (8–10 times), not vigorous shaking; (8) Minimize transport time and avoid temperature extremes.

Phlebotomy Test Pediatric Blood Collection 2

A toddler requires venipuncture but is extremely uncooperative.
Which approach is BEST?

🃏 Study This Quiz as Flashcards →

📚 Want to go deeper? Read the Full Exam Study Guide →