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Blood collection is one of the most frequently performed clinical procedures across hospitals, diagnostic laboratories, outpatient clinics, and mobile healthcare services. Despite being routine, venipuncture remains highly technique-sensitive. Small procedural errors can compromise specimen quality, delay diagnosis, and require costly redraws.
For medical professionals, especially phlebotomists, nurses, and laboratory staff, minimizing preanalytical errors is critical. Studies consistently show that most laboratory testing errors occur during the preanalytical phase, including specimen collection, labeling, and handling. Improper use of blood collection devices is a major contributor.
This article reviews the most common errors in blood collection devices in clinical settings and provides practical strategies, checklists, and training recommendations to reduce redos and improve specimen quality.
Before discussing specific errors, it is important to understand why the blood collection technique matters so much.
Laboratory results guide a significant portion of clinical decision-making. If a specimen is compromised during collection, the resulting data may be unreliable. This can lead to:
For example, hemolyzed specimens may produce falsely elevated potassium levels. If the clinician suspects hyperkalemia based on compromised results, unnecessary interventions could occur.
Because of these risks, standardized collection procedures and device handling are essential components of laboratory quality control.
Improper insertion angle is one of the most common technical errors during blood collection. While experienced practitioners often rely on muscle memory, deviations in angle can quickly disrupt blood flow.
The goal of venipuncture is to place the needle tip within the vein lumen while minimizing trauma to surrounding tissue. If the insertion angle is incorrect, several complications may occur:
These issues often appear as poor tube filling or loss of flow after the first tube. Devices designed for controlled needle positioning, such as winged infusion sets like the Reli® Safety Slide Blood Collection Infusion Set, can provide improved stability during insertion, particularly in patients with fragile or difficult-to-access veins.
Medical professionals may notice the following indicators:
Most adult venipuncture procedures should begin with an insertion angle between 15 and 30 degrees.
Key technique points include:
In patients with fragile veins, such as elderly individuals, a shallower insertion angle may reduce vein trauma.
Some modern safety blood collection sets, such as the RELI® Safety Blood Collection Set with EZ-Flash® Technology, also provide improved flash visualization to help clinicians confirm venous access quickly and reduce repeated needle adjustments.
If blood flow stops shortly after the first tube begins filling, try the following adjustments before removing the needle:
Minor adjustments often restore proper blood flow without requiring a second puncture.
Modern blood collection devices commonly include integrated safety mechanisms designed to prevent needlestick injuries. While these devices significantly improve workplace safety, improper activation can interfere with specimen collection or create exposure risks.
Push-button and sliding safety mechanisms are now widely used in clinical settings. Devices like the Reli® Push Button Safety Blood Collection Set allow clinicians to activate the safety feature immediately after needle withdrawal with a single-handed motion.
Activating the safety mechanism too early may:
Early activation often occurs when clinicians rush the final step of the procedure.
On the other hand, activating the device too late increases the risk of accidental needlestick injuries. This is especially dangerous when working in high-volume environments such as emergency departments or busy outpatient labs.
A consistent sequence helps prevent timing errors:
Facilities should incorporate hands-on device training whenever new safety devices are introduced. Practicing activation with training units helps staff build muscle memory and reduces hesitation during real procedures.
Following the correct order of draw prevents additive carryover between tubes. When tubes are filled in the wrong sequence, additives from one tube may contaminate the next specimen.
Even trace contamination can significantly affect laboratory results.
Improper tube order can lead to:
For laboratories, these errors often appear as unexpected or inconsistent lab values, prompting specimen rejection or repeat testing.
According to widely accepted guidelines, the recommended order of draw is:
Healthcare professionals can reduce order-of-draw mistakes by:
Many institutions also incorporate order-of-draw posters near phlebotomy workstations as quick reminders.
Vacuum blood collection tubes are designed to draw a precise volume of blood to maintain the correct blood-to-additive ratio. When tubes are underfilled, laboratory results may become unreliable.
The additive concentration inside collection tubes is calibrated for a specific sample volume. If the tube contains less blood than intended, the additive may become disproportionately concentrated.
This can cause several problems:
Coagulation testing tubes (light blue) are particularly sensitive. These tubes require a 9:1 blood-to-anticoagulant ratio, making full tube volume essential.
Underfilling may result from:
Medical professionals should follow these practices:
Using secure tube holders, such as the Reli® Blood Collection Tube Holder or the Reli® Safety Blood Collection Tube Holder, can help stabilize the collection system and reduce accidental tube movement or premature removal during the draw.
Another frequent but overlooked error involves excessive movement of collection tubes while attached to the holder.
Forceful insertion or removal of tubes can disrupt needle placement and irritate the vein.
Problems associated with tube movement include:
These issues are particularly common in patients with fragile veins or limited venous access.
To reduce disruption:
A steady hand is often the difference between a successful multi-tube collection and a failed venipuncture.
Standardized checklists help reinforce proper technique and reduce variability between practitioners.
Following this structured sequence can significantly reduce collection errors.
While individual skill plays an important role, systematic training programs have the greatest impact on reducing phlebotomy errors.
Healthcare organizations that achieve low redraw rates often emphasize ongoing competency development.
Practice with training arms and safety devices allows staff to refine technique without patient risk. Simulation is especially useful when introducing new blood collection systems.
Annual or semi-annual evaluations ensure that staff remain proficient in venipuncture technique, order of draw, and device handling.
Reviewing specimen rejection data helps identify recurring issues such as hemolysis or underfilled tubes. Addressing patterns allows targeted improvements.
Simple tools such as order-of-draw posters, procedure checklists, and quick reference cards can reinforce best practices during busy clinical workflows.
Even though blood collection is considered routine, it remains a highly technical procedure. Small deviations in technique can compromise specimen quality and lead to redraws.
For medical professionals, focusing on a few critical fundamentals makes the greatest difference:
By reinforcing these practices through training, checklists, and consistent procedures, healthcare facilities can significantly reduce venipuncture errors and improve laboratory reliability.
To learn more about MYCO Medical’s safety blood collection devices or to speak with a MYCO Medical representative, visit our Contact Us page.
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