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Hematocrit and plasma protein concentration
Increased blood viscosity is primarily determined by:
Better sample quality and larger volume with fewer contaminants
A key advantage of venipuncture over fingerstick when adequate veins exist is:
Licensed medical technologists and trained phlebotomists per institutional policy
Personnel who may perform venipuncture include:
A mnemonic referencing their predominance as first responders
“LDOC” associated with neutrophils in these notes most closely relates to:
No more than 1 minute before venipuncture
To minimize tourniquet‑induced hemoconcentration, apply the tourniquet for:
Hemoconcentration and spurious analyte elevation
Excessive fist clenching and massaging before draw can cause:
Are difficult to penetrate and may not yield adequate blood
Sclerosed or occluded veins are poor choices because they:
Causing hemoconcentration
Dehydration may falsely increase measured values by:
It lies in proximity to nerves and the brachial artery
In avoiding nerve injury, the basilic vein is less preferred because:
Bouncy, resilient feel and direction
When palpating a suitable vein, you assess for:
Alcohol swab in concentric circles, then allow to air‑dry
Skin antisepsis before venipuncture typically uses:
The tube’s stopper is pierced, engaging vacuum
After needle insertion, blood flow into an evacuated tube begins when:
Hemolysis of red cells
Excessive tube shaking can cause:
Mix blood with additives to prevent clotting or ensure proper action
Gentle inversion of additive tubes immediately after fill is necessary to:
Hemolyzed, contaminated sample with altered analytes
Drawing from a site with a hematoma may result in:
Sodium citrate (light blue)
For coagulation testing, the recommended tube is:
Prolonged clotting times due to excess anticoagulant
Incomplete filling of a citrate tube can cause:
EDTA
For CBC (complete blood count), the preferred additive is:
Certified low‑metal contamination (royal blue)
Trace element testing requires tubes:
The central calcaneus to prevent bone injury
In capillary puncture for infants, the safe heel puncture area avoids:
Tissue fluid contamination and hemolysis
During capillary collection, excessive squeezing (“milking”) the site risks:
Higher arterialized values (e.g., higher glucose shortly after meals)
Compared with venous samples, capillary blood may show:
Clotting factors including fibrinogen
A key difference between serum and plasma is the presence in plasma of:
Serum, gel, cells
After centrifugation of an SST, the correct top‑to‑bottom order is:
Release the tourniquet
Before removing the needle, you should:
Simulation with immediate feedback and competency assessment
VR (Virtual Reality) for phlebotomy training primarily offers:
Replacement of professional judgment
A disadvantage of overreliance on AI tools in venipuncture is:
Hemoglobin absorbs NIR, creating contrast with surrounding tissue
Near‑infrared (NIR) imaging identifies veins because:
Improved first‑stick success and reduced discomfort
A practical benefit of AI vein visualization in pediatrics and geriatrics is:
AccuVein and VeinViewer
Examples of AI‑assisted vein visualization devices include:
Ultrasound imaging, AI recognition, robotic guidance
Robotic venipuncture systems typically integrate:
Improved accuracy and reduced human error in suitable cases
A core advantage of robotic venipuncture is:
High equipment cost and need for operator training
A limitation of AI‑guided venipuncture devices is:
Guiding site selection and optimizing depth to prevent injury
In skin puncture procedures, AI could assist by:
Standardized training and error detection before patient contact
Simulation‑based learning with AI contributes to: