Lab technician: who performs the tests

A laboratory technician is a healthcare professional responsible for the collection, preparation, and analysis of biological samples (blood, urine, sputum, tissue, etc.) and for providing accurate, timely results that inform clinical decisions. The role of the laboratory in medicine is difficult to overestimate: 60-70% of clinical decisions, including diagnosis, treatment selection, and patient discharge, are based on numerous laboratory tests. [1]

In modern healthcare, laboratory technicians perform a wide range of tasks, from simple microscopic observations to operating automated analyzers, molecular diagnostics, and quality control. The work requires precision, knowledge of the biological basis of testing, and strict adherence to protocols. [2]

A laboratory technician operates in three interrelated phases of the laboratory cycle: preanalytical (sample collection and preparation), analytical (test execution), and postanalytical (result verification, validation, and communication). Errors in any phase can lead to incorrect clinical decisions, so attention to procedures is critical. [3]

Finally, laboratory technicians often work in a team: with physicians, clinical chemists, microbiologists, and quality specialists. In small laboratories, a single technician may perform several functions; in larger laboratories, tasks are more specialized. The professionalism of the staff directly impacts patient safety and the economics of the healthcare system. [4]

Education, Certification, and Professional Development

Educational requirements vary by country, and may include a medical degree with specialized training, a bachelor's degree in clinical laboratory diagnostics, or a medical technologist degree. Some jurisdictions require licensing and state certification for certain techniques. [5]

Continuous professional development is key: the emergence of new molecular methods, automation, and regulatory standards makes continuous training essential. Courses on biological material safety, sample collection techniques, quality management, and the use of new analyzers are part of the professional routine. [6]

For laboratories seeking industry recognition, accreditation to quality standards (ISO 15189) is important. Understanding the requirements of the standard and participating in external quality assessment (EQA) is part of the professional responsibility of laboratory technicians and laboratory managers. [7]

Career development often progresses through specializations (hematology, clinical biochemistry, microbiology, immunology, molecular diagnostics) and progression to supervisory, quality control, or laboratory manager roles. Practical experience and documented training increase the chances of advancement. [8]

Daily work cycle: pre-analytics, analytics, post-analytics

Preanalytics includes request acceptance, patient identification, and sample collection and transportation procedures. It is during this phase that the greatest number of errors are observed, ranging from improper labeling to inadequate patient preparation. Estimates indicate that 40-70% of laboratory errors occur during the preanalytical stage. Monitoring this phase is a priority for quality improvement. [9]

The analytical phase involves operating the instrument, running methods, calibration, and quality control. Modern automated platforms increase throughput but require proper maintenance, monitoring for deviations, and the ability to interpret the instrument signal in a clinical context. Manual methods are reserved for specialized tests. [10]

Postanalytics involves verifying the obtained data, interpreting anomalies, correcting errors (if possible), and generating a report for the physician. Communication with the clinician is essential: explanations of non-standard results, recommendations for repeat samples, or alternatives. Critical values require immediate communication with the referring physician. [11]

Data quality is maintained by laboratory management systems (LIS), internal and external quality control, calibration protocols, and documentation of any interventions. The laboratory technician is involved in all these processes: maintaining records, flagging deviations, and participating in incident investigations. [12]

Quality Control and Accreditation: Why ISO 15189 Matters

Laboratory quality is a combination of technical competence and reliable management. ISO 15189 defines requirements for laboratory quality and competence systems; accreditation to this standard confirms that a laboratory operates in accordance with international practices and controls risks to patients. [13]

Internal quality control practices include control samples, calibrations, method validation, and monitoring of key quality indicators (processing time, retest frequency, percentage of nonconforming tests). External quality assessment (EQA) compares results with other laboratories and identifies systemic errors. Participation in EQA is a mandatory element of maintaining competence. [14]

Laboratory risk management today is oriented toward a patient-centered approach: critical points in the testing chain are analyzed, risks are assessed, and countermeasures are implemented. This is included in the latest editions of ISO standards and in recommendations from major equipment suppliers. [15]

The laboratory technician is the first line of control: ensuring proper collection, proper labeling, adherence to transportation deadlines, and accurate recording of results. A systematic approach increases clinician confidence and reduces the likelihood of patient harm due to erroneous data. [16]

Laboratory safety and biosecurity

Working with potentially hazardous materials requires adherence to biosafety regulations. These practices include the use of personal protective equipment, closed analytical systems when handling aerosols, proper waste disposal, and vaccination of personnel when indicated. WHO and CDC guidelines detail biosafety levels and requirements for facilities and procedures. [17]

A biological risk assessment determines which work can be performed in a standard clinical laboratory and which requires BSL-2 or higher. Laboratories must document procedures to minimize the risk of infection transmission to workers and patients. Regular biosafety training and emergency scenario exercises are mandatory. [18]

Incidents (needlestick injuries, biomaterial spills) require immediate action: cleaning, notifying the responsible person, recording, and investigating the cause. Protocols minimize the recurrence of errors and ensure rapid access to post-exposure prophylaxis if needed. [19]

Psychological preparedness and adherence to rules are no less important than technical skills: fatigue, overload, and staff shortages increase the risk of safety violations and errors. Management must consider work ergonomics and schedules to reduce the risk of human error. [20]

New technologies: automation, molecular diagnostics and POCT

Automation increases throughput and reduces variability, but requires skills in operation and interpretation of results with uncertain signals. Multi-stage automated workstations integrate biochemistry, hematology, and immunology, significantly changing the daily work of laboratory technicians. [21]

Molecular diagnostics (PCR, sequencing) have expanded laboratory capabilities: pathogen isolation, genetic testing, and tumor markers. These methods make laboratory diagnostics more sensitive and specific, but require strict contamination control and personnel qualifications. [22]

Point-of-care testing (POC) brings some diagnostics closer to the patient—to the emergency room, physician's office, or branch office. Laboratory staff play a role in POCT validation, user training, and quality control of these systems. POCT line control and data integration into the LIS are critical to data integrity. [23]

The development of data analytics and integration with electronic medical records improve quality monitoring and enable the application of decision-making algorithms. Laboratory specialists are being involved in projects using big data and validating new biomarkers. [24]

Practical tables and checklists

Table 1. Main responsibilities of a laboratory assistant (briefly)

Region	Task
Preanalytics	Receiving applications, identification, collection, marking, transportation
Analytics	Preparation of reagents, launch of analyzers, quality control
Postanalytics	Validation of results, preparation of reports, communication with doctors
Safety	PPE, disposal, biosecurity, incident response
Quality	Internal control, participation in EQA, documentation

Table 2. Typical causes of errors and ways to reduce them

Error	Cause	Countermeasure
Incorrect labeling	Human factor, haste	Two-stage identification, barcodes
Inappropriate patient preparation	Information not provided	Oral and written instructions to the patient
Violation of transport conditions	Temperature, time	Use of thermal containers, SOP
Technical failures of the device	Service	Preventive maintenance and documentation

Table 3. Checklist for receiving biomaterial

Step	Control
Name and code match	2 independent checks
The right container	Checking the type and volume
Proper preparation of the patient	Availability of instructions (on an empty stomach, etc.)
Time and conditions of transport	Time stamp, temperature on demand

Table 4. Quality control - internal indicators

Indicator	Target value
Time from collection to result (TAT)	≤ the target time specified by the laboratory
Frequency of repeat tests	< 2-5% (depending on the method)
EQA non-compliance rate	Compliance with control ranges
Error rate in preanalytics	Minimization, trend monitoring

Table 5. Quick Biosafety Checklist

Paragraph	Action
PPE	Put on gloves, a gown, and, if necessary, glasses/mask
Working with aerosols	Use fume hoods/capsules
Cleaning and disinfection	Regular protocols, processing log
Incidents	Immediate notification, recording, analysis

How a patient can prepare for a laboratory examination

For many tests, preparation is essential: fasting for 8-12 hours, temporarily discontinuing certain medications, and avoiding strenuous exercise before testing. Improper preparation can distort results and lead to repeat visits. Always check the requirements for a specific test with the registrar or the laboratory instructions. [25]

Identification is key to security: when applying, please present a photo ID and state your date of birth; the laboratory must ensure a match between the patient and the test tube through barcodes or double-checking. This reduces the risk of errors in results. [26]

If the patient is taking anticoagulants, immunosuppressants, antibiotics, or other important medications, please inform them in advance; some tests require temporary adjustments to therapy or a special approach to interpreting the results. Also inform them about pregnancy or serious chronic illnesses. [27]

If a critical result occurs, a laboratory technician or specialist will contact the referring physician. The patient can inquire about the procedure for obtaining results and the communication channel if urgent information is needed. Transparency and information improve patient safety and satisfaction. [28]

Brief practical conclusion

Laboratory technicians are invisible but critical participants in the clinical process. Professionalism in preanalytics, analytics, and postanalytics, compliance with ISO 15189 standards, strict biosafety measures, and engagement with modern technologies determine the quality and safety of laboratory diagnostics. Investments in education, automation, and quality systems directly return in the form of more reliable clinical decisions and less harm to patients. [29]