Hematology point of care testing and laboratory errors: an example of multidisciplinary management at a children's hospital in northeast Italy.

Involvement of health personnel in a medical audit can reduce the number of errors in laboratory medicine. The checked control of point of care testing (POCT) could be an answer to developing a better medical service in the emergency department and decreasing the time taken to report tests. The performance of sanitary personnel from different disciplines was studied over an 18-month period in a children's hospital. Clinical errors in the emergency and laboratory departments were monitored by: nursing instruction using specific courses, POCT, and external quality control; improvement of test results and procedural accuracy; and reduction of hemolyzed and nonprotocol-conforming samples sent to the laboratory department. In January 2012, point of care testing (POCT) was instituted in three medical units (neonatology, resuscitation, delivery room) at the Children's Hospital in Trieste, northeast Italy, for analysis of hematochemical samples. In the same period, during the months of January 2012 and June 2013, 1,600 samples sent to central laboratory and their related preanalytical errors were examined for accuracy. External quality control for POCT was also monitored in the emergency department; three meetings were held with physicians, nurses, and laboratory technicians to highlight problems, ie, preanalytical errors and analytical methodologies associated with POCT. During the study, there was an improvement in external quality control for POCT from -3 or -2 standard deviations or more to one standard deviation for all parameters. Of 800 samples examined in the laboratory in January 2012, we identified 64 preanalytical errors (8.0%); in June 2013, there were 17 preanalytical errors (2.1%), representing a significant decrease (P<0.05, χ(2) test). Multidisciplinary management and clinical audit can be used as tools to detect errors caused by organizational problems outside the laboratory and improve clinical and economic outcomes.

Introduction

Laboratory testing is a highly complex process, and although laboratory services are relatively safe, they are not as safe as they could or should be. Clinical laboratories have long focused their attention on quality control methods and quality assessment programs dealing with the analytical aspects of testing. However, a growing body of evidence accumulated in recent decades demonstrates that quality in clinical laboratories cannot be assured by merely focusing on purely analytical aspects.1–5 More recent surveys of errors in laboratory medicine have concluded that mistakes occur more frequently before (preanalytical) and after (postanalytical) the test is performed. Rapid test reporting is particularly important in the emergency department. The risk of errors due to analytical problems has been significantly reduced over time, but there is evidence that carelessness may still have a serious impact on reporting. Mistakes made during the entire testing process are referred to as laboratory errors, although these may be due to haste or poor instruction and communication on the part of personnel, actions taken by others involved in the testing process (eg, physicians, nurses, phlebotomists, and laboratory technicians), or a poorly designed process, all of which are beyond the control of the laboratory. Constant turnover of staff in the emergency department and use of travelling nurses present a difficult challenge in terms of maintaining good practice. Further, there is evidence that laboratory information is often only partially utilized.6–8

Point of care testing (POCT) is a modern approach that could help to resolve some health care problems because it is centered on the needs and satisfaction of patients, particularly if laboratory departments have to provide a lot of test answers in a short space of time. This methodology is defined as medical testing at or near the site of patient care, to support timely, safe, and effective acute care (cardiac, metabolic, coagulation, respiratory distress). However, this strategy must be of the same standard as that in the central laboratory, and necessitates the involvement of more personnel from specialties outside the laboratory.9

In the changing landscape of the health care system, hospitals are becoming increasingly involved in the treatment of acute disease, and clinical laboratories have to increase their efficiency. Therefore, laboratory professionals, who are required to reduce costs, simplify processes, and decrease staff numbers, have considered the possibility of incorporating emergency testing into their routine work as a result of the improved productivity and flexibility of laboratory automation. In many situations, it is faster to perform both routine and emergency testing, with priority given to emergency testing, thereby simplifying laboratory processes and improving turnaround time. However, if the turnaround time does not satisfy physicians in the emergency department, the laboratory may need to take action to reduce the time interval between receiving requests and providing results. This improves clinical decision-making and patient management. The creation of large core laboratories as the centerpiece of pathology consortiums will increase the demand for POCT unless transport of specimens and information technology facilities are radically improved.10

This paper describes the most frequent and risky analytical errors, especially in the preanalytical phase, occurring at the Children’s Hospital in Trieste, northeast Italy, related to the laboratory and emergency departments. The use of POCT as a modern pathology service involves information and instruction management about the importance to compare the test results with an external quality control. The purpose of this research was to demonstrate that meetings and audit processes involving sanitary personnel from both the laboratory and emergency departments can improve the performance of POCT and decrease the number of preanalytical laboratory errors.

Materials and methods

This work was conducted between January 2012 and June 2013, and involved sanitary personnel from three medical units (neonatology, resuscitation, delivery room) and technicians in the laboratory department. Studying this period of time, the preanalytical errors of tests sent to the laboratory department were examined. In the same period the emergency department was provided with three new POCT and the related external quality control of the analysis.

Three meetings were held with physicians, nurses, and laboratory technicians, to highlight two problems, ie, preanalytical errors and analytical methodologies used for POCT. For POCT in the emergency department, we used a hematology analyzer (Abacus Junior 30, Radiometer, Milan, Italy) to determine hemoglobin, hematocrit, mean corpuscular hemoglobin, mean corpuscular hemoglobin concentration, mean corpuscular volume, mean platelet volume, plateletcrit, platelets, red blood cells, red cell distribution, and white blood cells, and two blood gas instruments (ABL 800 FLEX, Radiometer, Milan, Italy) to analyze pCO2, pH, pO2, calcium, chloride, glucose, lactate, potassium, and sodium. RIQAS reports from Randox Laboratories Ltd (Crumlin, UK) were used for external quality control. The χ2 test was used to test for a statistically significant difference between the number of preanalytical errors made at the beginning and end of the study. All members of the nursing staff signed a consent form to confirm their voluntary participation in the study, and accepted the methodology of the course, ie, objectives, teaching and learning methods, and expected outcome. This research had the approval of the bioethics committee at our institution.

Results

The core laboratory director provided weekly external quality control reports for POCT, and a review of preanalytical errors was undertaken. After 6 months, the laboratory director held the first meeting with sanitary personnel of the emergency and laboratory departments, to explain the problems identified and the methodology needed to solve these problems. At the end of the study, the results were forwarded to the medical units and key points were discussed (Tables 1–4).

Table 1

Preanalytical errors in 800 examined samples sent to the central laboratory from the neonatology, resuscitation, and delivery room units from January 2012 to June 2013

Analyte	Mean for comparison	POCT result	SDI	% DEV
Hematology POCT of neonatology (January 2012)
Hemoglobin	5.995	6.200	1.32	3.4
Hematocrit (HCT)	20.576	20.750	0.22	0.8
MCH	27.958	30.700	2.25	9.8
MCHC	29.184	30.000	0.65	2.8
MCV	96.326	102.000	1.53	5.9
Mean platelet volume (pilot)	9.167	8.700	−0.74	−5.1
Plateletcrit (pilot)	0.040	0.030	−1.78	−24.9
Platelets (impedance count)	47.500	32.000	−3.55	−32.6
RBC (impedance count)	2.158	2.030	−2.57	−5.9
Red cell dist width CV (pilot)	13.900	14.100	0.65	1.4
Red cell dist width SD (pilot)	47.881	No result
WBC (impedance count)	3.163	3.120	−0.35	−1.3

Note: The difference between total errors at the start and end of the study (64 versus 17) is statistically significant (P<0.05). Bold figures depict alarm value.

Abbreviations: MCH, mean corpuscular hemoglobin; MCHC, mean corpuscular hemoglobin concentration; RBC, red blood cells; SDI, standard deviation index; POCT, point of care testing; WBC, white blood cells; % DEV, standard deviation percentage; dist, distribution; CV, coefficient of variation; SD, standard deviation.

Table 4

Confirmed improvement of external quality control in the delivery room from January 2012 to June 2013

Analyte	Mean for comparison	POCT result	SDI	% DEV
Blood gas POCT of delivery room (January 2012)
pCO2	83.896	87.300	0.89	4.1
pH	7.033	7.024	−0.31	−0.1
pO2	52.962	52.600	−0.05	−0.7
Calcium	1.862	1.890	0.27	1.5
Chloride	76.508	74.000	−1.02	−3.3
Glucose	9.320	6.000	−2.83	−35.6
Lactate	6.171	6.300	0.17	2.1
Potassium	3.354	3.300	−0.63	−1.6
Sodium	120.732	120.000	−0.42	−0.6
Blood gas POCT of delivery room (June 2013)
pCO2	18.128	17.700	−0.52	−2.4
pH	7.535	7.540	0.17	0.1
pO2	141.878	157.000	0.78	10.7
Calcium	1.060	1.110	0.86	4.7
Chloride	120.833	122.000	0.30	1.0
Glucose	251.294	246.000	−0.18	−2.1
Lactate	0.841	0.900	0.57	7.0
Potassium	6.488	6.500	0.07	0.2
Sodium	155.493	158.000	1.11	1.6

Note: Bold figures depict alarm value.

Abbreviations: SDI, standard deviation index (mean of comparison); POCT, point of care testing; % DEV, standard deviation percentage.

Of 800 samples examined in the laboratory department in January 2012, we identified 64 preanalytical errors (8.0%), classified as hemolysis, insufficient sampling, late arrival, not conforming to medical protocol, and without diagnosis; however, in June 2013, of 800 samples examined, only 17 preanalytical errors (2.1%) were identified, representing a significant decrease (P<0.05, χ2 test). During the study, there was an improvement in external quality control for POCT from −3 or −2 standard deviations or more to one standard deviation for all parameters.

In the emergency department setting, time is an important factor in the assessment, diagnosis, and stabilization of patients, and every effort should be made to save time when collecting laboratory specimens. Nurses often collect blood from an existing intravenous catheter to avoid a second venepuncture, thereby increasing efficiency and decreasing patient discomfort; however, increased hemolysis rates have been attributed to the practice of obtaining blood specimens in this way. Data collection points demonstrated that drawing blood through an intravenous catheter was associated with hemolysis more frequently than using an intravenous catheter with a connected syringe. The principal problems identified were to do with transport of specimens, deviation from diagnostic protocols, and software programs used in the laboratory. Other observations noted by sanitary personnel included the finite staffing resources available in the emergency department and the high workload of staff caring for disabled pediatric and small for date neonatology patients, which can reduce the efficiency of certain procedures.

The most frequent and risky preanalytical errors were identified. Such problems were often due to poor communication, and action should be taken by all sanitary personnel involved in the testing (physicians, nurses, and phlebotomists in the laboratory and emergency departments) and transport process. In the collaborative approach to ensuring overall quality, the risk of errors and mistakes in laboratory testing must be minimized to guarantee the total quality of a laboratory service.11–16 Health personnel in the emergency department can affect tests in the laboratory, but nurses and doctors must be educated, given specific instructions, and complete courses on POCT. POCT data must be monthly controlled by laboratory quality control. The improvement in external quality control seen in this study demonstrates that nursing staff in the emergency department can provide more efficient patient care. Their frequent execution, almost weekly, making sure data diagnostic process, can facilitate clinical decision, leading to a decrease in specimen recollection rates. It is important to improve specimen acceptability results in quicker laboratory results, to physicians who can have available the patient test report sooner; this positively affects patient outcomes in the emergency department. The study shows only a decrease in errors, but it does not ensure in general that appropriate therapies were given. POCT is not the solution to preanalytical nursing errors, but is important with regard to the needs of patients.17,18

Discussion

In the past, laboratory testing in Italy has been performed by physicians and laboratory technicians in a central laboratory, with some testing performed by “satellite” laboratories separate from the central laboratory, but still involving laboratory personnel. This is a historical model, different from that of the modern central laboratory. Attitudes concerning laboratory testing have changed significantly in the last few years and the economic problem of personnel cost imposes, in a modern approach, that technology POCT can be used by nurses at or near the site of patient care monitoring the patient without hospital admission. Maintaining the status quo (a central laboratory and other “satellite” laboratories) is not a good strategy for survival in laboratory medicine today.19–22 High-quality biological samples are needed, but are not sufficient alone for the quality of laboratory results. The total quality of a test is determined by control of analytical and preanalytical processes and by cooperation between laboratory technicians and other health care professionals, especially nurses. This is essential for reducing errors and for better analytical performance. Training protocols must be established and all potential operators must achieve an adequate level of competence. The content of the training program (including temperature, time, and modality of transportation to avoid contamination) and assessment of knowledge/skill levels should be documented in a training manual with a job description, that includes sample requirements, specimen collection, sample preparation, stability of reagents, and calibration of instruments.23,24

International guidelines and recommendations, along with procedures for quality and performance control, must also be approved and used for POCT in the emergency department. Laboratory medicine, like all health care, takes place in a dynamic, rapidly changing environment. As the standard of care changes, technology develops, and the economics of health care continue to change, the technology of POCT will be challenged to find new strategy. The economic benefits of POCT are proven when risk management concepts are applied. It means this approach to affront the clinical needs of the standard of care will be more used in the future. By understanding and considering POCT in the next future this concept may become aware of best way to meet the needs of medical care at residence (ie, management of coagulation therapy).25–27

Recognition of normal and abnormal results, as well as an understanding of the multidisciplinary action needed in the event of an abnormal result are essential.28–30 Faster is not always better, and in our experience POCT should be restricted to measurement of vital functions requiring an immediate response, eg, blood glucose, hemoglobin, and electrolytes (sodium, potassium, ionized calcium).31 The authors do not recommend introduction of POCT in the emergency department to solve the problem of inappropriate samples and inadequate transport to the laboratory department. However, collaboration and instruction of all sanitary personnel involved is essential to deal with preanalytical errors, performance of POCT, and external quality control, to maintain patient safety, and to improve risk management. The lack of studies like this can carry two other considerations, ie, the limits of a very expensive technology and the difficult in applying it, not only in the hospital but also at place of residence.32 Further studies and experience are necessary to resolve these questions.

Table 2

Confirmed improvement of external quality control in the neonatology unit from January 2012 to June 2013

Analyte	Mean for comparison	POCT result	SDI	% DEV
Hematology POCT of neonatology (June 2013)
Hemoglobin	13.741	14.300	1.85	4.1
Hematocrit (HCT)	42.303	45.410	1.77	7.3
MCH	29.572	30.100	0.46	1.8
MCHC	32.889	31.400	−1.10	−4.5
MCV	89.794	96.000	1.80	6.9
Mean platelet volume (pilot)	10.586	9.600	−1.56	−9.3
Plateletcrit (pilot)	0.213	0.240	1.13	12.8
Platelets (impedance count)	225.778	250.000	1.50	10.7
RBC (impedance count)	4.656	4.730	0.71	1.6
Red cell dist width CV (pilot)	14.733	14.700	−0.20	−0.2
Red cell dist width SD (pilot)		No result
WBC (impedance count)	9.398	9.120	−0.71	−3.0

Abbreviations: MCH, mean corpuscular hemoglobin; MCHC, mean corpuscular hemoglobin concentration; RBC, red blood cells; SDI, standard deviation index (mean of comparison); POCT, point of care testing; WBC, white blood cells; % DEV, standard deviation percentage; dist, distribution; CV, coefficient of variation, SD, standard deviation.

Table 3

Confirmed improvement of external quality control in the resuscitation unit from January 2012 to June 2013

Analyte	Mean for comparison	POCT result	SDI	% DEV
Blood gas POCT of resuscitation unit (January 2012)
pCO2	18.987	19.200	0.25	1.1
pH	7.521	7.527	0.21	0.1
pO2	143.084	152.000	0.45	6.2
Calcium	0.848	0.861	0.27	1.5
Chloride	119.313	119.300	−0.00	−0.0
Glucose	249.288	264.000	0.49	5.9
Lactate	0.985	1.000	0.12	1.5
Potassium	6.635	6.730	0.56	1.4
Sodium	155.476	155.700	0.10	0.1
Blood gas POCT of resuscitation unit (June 2013)
pCO2	89.528	84.900	−1.13	−5.2
pH	7.052	7.062	0.35	0.1
pO2	81.249	103.600	2.00	27.5
Calcium	1.722	1.738	0.17	0.9
Chloride	80.664	79.100	−0.60	−1.9
Glucose	8.657	12.000	1.26	38.6
Lactate	6.645	6.900	0.31	3.8
Potassium	3.125	3.120	−0.07	−0.2
Sodium	120.612	120.200	−0.23	−0.3

Note: Bold figures depict alarm value.

Abbreviations: SDI, standard deviation index (mean of comparison); POCT, point of care testing; % DEV, standard deviation percentage.