Point of Care Testing (POCT) Explained
Point of Care Testing (POCT) Explained
Point of Care Testing (POCT) is the delivery of a test at the point in time at which the result will be used to make a decision and taking appropriate action resulting in an improved health outcome. It is also known as near patient, bed-side, extra-laboratory, decentralised, and ancillary testing [1]. It has been shown to reduce hospital stay time, reduce complications, and improve adherence to treatment [2].
Point of care testing is not a recent practice; many early diagnostic tests were administered at the bedside. However, analytical technology has progressed and multiple tests can be performed within minutes in a laboratory. Recently, this technology has been put into the hands of the staff near the patients [2]. There are two types of technology, benchtop analysers and hand held devices. Bench top systems are just smaller versions of laboratory analysers but some steps are automated. Hand held devices are simple in appearance but complex internally, they can manage several tasks including, adding reagents, separating cells from plasma, and reading colour or other measures.
Results can be obtained faster, allowing for more immediate decisions meaning treatment can begin sooner. Patients can live a longer and higher quality life, helped by a reduction in the length of hospital stays.
Some benefits of POCT [2]:
Key objective
The main objective of Point of Care Testing is to generate results more quickly so that appropriate treatment can be provided, resulting in an improved patient outcome.
Management
Accurate and reliable results can only be obtained if the patient and sample are treated correctly. Point of care testing is likely to be performed by staff with a limited technical background, so training and quality control are vital.
Outcomes
Proper analysis technique alone is not enough to ensure an accurate decision; any test will only be beneficial if the appropriate action is taken based on the result. The effectiveness of POCT is assessed in terms of the overall outcome of the patient.
There are three phases in the POCT cycle: pre-analytical phase, analytical phase, and post-analytical phase. About 90% of quality issues are attributed to the pre-analytical and post-analytical phases [3]. These errors are mainly attributed to user error and can be caused by a number of issues including, selecting the wrong POCT device, not following manufacturer instructions, inadequate training, not adhering to appropriate QC practices, and many more.
The errors can usually be mitigated by implementing an action plan and ensuring it is executed exactly as designed, deviation from the action plan will lead to errors. Errors in POCT diagnostics can lead to misdiagnosis, improper treatment, costly follow-up procedures, and death.
Some strategies for improvement:
Internal Quality Control and External Quality Assessment is conducted to monitor the stability of the analytical measurement system and to alert the operator to a change that may lead to a medically significant error [6].
A study by Price, Smith and Bruel [8] was conducted on a number of labs over a period of time of up to 15 years. They discovered that test result performance improved with time and was associated with regular participation in External Quality Assessment (EQA) schemes and with the use of internal quality control (IQC) procedures.
Internal Quality Control
Internal Quality Control (IQC) is used to assess the day-to-day consistency of assay performance, providing quality assurance for patient results. IQC activities are among the ten most common POCT deficiencies. These may include performing and documenting quality control testing and taking the correct action for outliers [4]. This poor performance could be attributed to how IQC is viewed in POCT; users may lack appreciation of the potential for errors and may see the analyser as infallible, they likely see IQC as an additional workload as opposed to part of their testing routine.
CLSI regulations require risk assessment for each stage of patient testing alongside an implementation of a quality control plan. Below are some suggestions for how IQC should be conducted for POCT.
Conduct
IQC should be conducted when: a new lot of consumable is used; a patient result is queried; after maintenance; the device has been physically insulted. IQC should be conducted by the usual device operator so assurance can be provided for the whole testing process.
Training
ISO 22870 requires POCT users should be trained in the theory and practice of IQC [5]. Staff should be trained in every aspect of POCT including storage, preparation, frequency, documentation and basic troubleshooting.
Material
QC material for POCT should be obtained from a third party provider and not rely on material provided by the device manufacturer, the benefits of which are well documented. It should also contain analytes at clinically relevant concentrations, be provided ready-to-use, and be stable at ambient temperatures.
Results
All IQC results must be recorded with the date, time, user, decision to accept or reject, and any actions taken as appropriate. Locally assigned ranges alongside analyte-specific rules should be used to maximise error detection. An example of how IQC could be recorded and an action flowchart can be seen in Fig. A below.
Troubleshooting
There should be a protocol for required actions following a failed IQC. Any troubleshooting should be developed with knowledge of the most common errors and user capability.
Review
A monthly review should be conducted to identify persistent failures and trends.
The cost of IQC may also be a factor in resistance to IQC, however, while it is difficult to quantify, the cost of not conducting it may be greater in terms of human harm. A whitepaper is available detailing IQC in POCT (download).
![Fig. A Examples of a manual IQC documentation, adapted from the Australian Government’s POCT General Practice [4]](https://www.randox.com/wp-content/uploads/2018/08/Fig.-A.jpg "Fig. A")
Fig. A Examples of a manual IQC documentation, adapted from the Australian Government’s POCT General Practice [4]. (Click to expand)
External Quality Assessment
External Quality Assessment (EQA) or Proficiency Testing (PT) involves running blind patient-like samples and comparing your results to peer results, in order to retrospectively monitor the accuracy of reporting. EQA samples should be treated as if they were a patient sample and therefore must be run by personnel who would normally use the device. This provides confidence in the reliability of patient test results. (Learn more about EQA)
Benefits of participation in an EQA programme include assessment of result accuracy, assessment over time, comparisons with instruments, methods and peers, and providing confidence in test results.
EQA for POCT is, in theory, similar to EQA in a large laboratory. There is a significant difference however, the POCT participants are usually health care professionals with little knowledge of laboratory medicine. A lack of understanding of the importance of EQA had led to a smaller percentage of sites participating than large laboratories.
A Good EQA Scheme
A good EQA scheme should offer:
Conducting EQA in POCT
Below are some suggestions for how EQA should be conducted for POCT.
Conduct
EQA should be conducted by the operator who normally conducts patient testing to ensure the true workflow is assessed [6].
Material
EQA samples should be commutable, meaning they have the same numeric relationship between measurements procedures as is observed for a panel of patient samples (reacts the same as a real patient sample).
Report Frequency
Challenges / surveys should be frequent enough to identify systematic errors in a timely manner, affecting the fewest patient results [10].
Report Turnaround
A fast turnaround time allows test system errors to be identified sooner and necessary corrective actions to be taken immediately with minimum disruption to the lab.
Review
A regular review of past EQA results should be part of the cycle of quality.
Guidance
A POCT EQA provider should be able to provide assistance when the user is having difficulties.
Results
Individuals carrying out testing should have the correct knowledge to interpret results, choosing a scheme with easy to interpret results can help.
Internal Quality Control
Randox offer a number of controls suitable for Point of Care Testing applications:
Acusera Blood Gas Control
The Randox Acusera Blood Gas Quality Controls contain assayed target values for ten parameters, covering pH, pCO2, pO2, electrolytes, glucose and lactate. The material is provided in easy to open ampoules for added convenience and ease-of-use. The liquid ready-to-use nature of the control makes it ideal for use in point-of-care testing and on a wide range of blood gas instruments.
Acusera Liquid Cardiac Control
The Randox Acusera Liquid Cardiac control is designed to be both convenient and easy to use. The liquid ready-to-use format makes it ideal for both clinical laboratories and point-of-care testing. Assayed, instrument specific values are provided for an impressive 8 cardiac markers including, NT-ProBNP, D-dimer and Troponin ensuring consolidation and flexibility. Furthermore, an open vial stability of 30 days for all analytes helps to keep waste and costs to a minimum.
Acusera Liquid HbA1c Control
Liquid Urine Control
The Randox Acusera Liquid Urine quality control is designed to be both convenient and easy to use. The liquid ready-to-use format eliminates issues with pipetting and allows convenient storage at 2℃ – 8℃. Assayed instrument and method specific target values and ranges are provided for 18 commonly tested urine chemistry parameters.
External Quality Assessment
Randox offers RIQAS Point of Care, a simple EQA scheme designed for use in point of care settings. It is a single sample, single scheme programme featuring whole blood samples for authentic patient sample assessment.
RIQAS
RIQAS Point of Care
Acusera
[1] C. Price, A. St john and J. Hicks, “Point-of-care testing”, 2004. [Online]. Available: http://mldt.hu/upload/labor/document/PRICEP.pdf. [Accessed: 23- Jul- 2018].
[2] C. Price, “Point of care testing”, BMJ, vol. 322, pp. 1285-1288, 2001.
[3] A. Okorodudu, “Optimizing accuracy and precision for point-of-care tests”, Acutecaretesting.org, 2011. [Online]. Available: https://acutecaretesting.org/en/articles/optimizing-accuracy-and-precision-for-point-of-care-tests. [Accessed: 24- Jul- 2018].
[4] H. Holt and D. Freedman, “Internal quality control in point-of-care testing: where’s the evidence?”, Annals of Clinical Biochemistry, vol. 53, no. 2, pp. 233-239, 2016.
[5] “ISO 22870:2016 – Point-of-care testing (POCT) — Requirements for quality and competence”, Iso.org, 2018. [Online]. Available: https://www.iso.org/standard/71119.html. [Accessed: 25- Jul- 2018].
[6] J. Gill and M. Shephard, “The Conduct of Quality Control and Quality Assurance Testing for PoCT Outside the Laboratory”, Clin Biochem Rev., vol. 31, no. 3, pp. 85-88, 2010.
[7] A. Stavelin and S. Sandberg, “Essential aspects of external quality assurance for point-of-care testing”, Biochemia Medica, pp. 81-85, 2017.
[8] C. Price, I. Smith and A. Van den Bruel, “Improving the quality of point-of-care testing”, Family Practice, vol. 35, no. 4, pp. 358-364, 2017.
[9] “ISO 15189:2012 – Medical laboratories — Requirements for quality and competence”, Iso.org, 2018. [Online]. Available: https://www.iso.org/standard/56115.html. [Accessed: 31- Jul- 2018].
[10] J. Crilly, “Mythbusting: Frequency of EQA Reports”, Randox Laboratories, 2017.
[11] G. Kristensen and P. Meijer, “Interpretation of EQA results and EQA-based trouble shooting”, Biochemia Medica, pp. 49-62, 2017.
RIQAS Point of Care – FAQs
RIQAS Point of Care
RIQAS
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ISO 22870- Are you meeting expectations?
Quality control has recently become crucial in the Point-of-Care (POC) field due to the introduction of ISO 22870 regulations and increased focus in patient safety. Quality control is critical in reducing turnaround time and saving money.
There is now an international standard specifically for POC testing, ISO 22870. This standard is intended to be used in conjunction with the standard for medical laboratories, ISO 15189. This means that aspects relating to Point-of-Care such as training, competence and documentation should be carefully planned, implemented and governed by a quality management system and there is a requirement for QC and EQA to be performed, where available.
POCT is typically carried out by non-laboratory staff, therefore when selecting the appropriate IQC material for POCT there are a number of key characteristics you must consider;
- Format of the material – QC material employed should be liquid stable, requiring no preparation, reducing the likelihood of human error and increasing convenience.
- Value assignment – all values must be accurately assigned. Look out for suppliers who use a large number of independent labs to determine the target value.
- Third party controls – manufactured independently from any specific instrument or method third party controls are designed to deliver unbiased performance assessment.
- Storage – for convenience controls should be liquid stable, as these can be easily stored in a fridge at 2oC – 8oC and won’t need to be shipped on dry ice.
- Stability – a control with a good open vial stability will mean that it can be used for longer with less waste produced, meaning it is more convenient for the medical professional to use.
- Transportation– the liquid stable controls can be conveniently stored at 2oC – 8oC reducing the need to ship on dry ice
- Minimal training– easy to use with little training required, therefore suitable for use by non-laboratory personnel
In addition to IQC, External Quality Assessment (EQA) must also be employed to ensure a comprehensive review of test system performance. It is best to select a programme that offers frequent reporting with a large database of users. This will enable rapid error identification and ultimately accurate and reliable patient testing.
Our Acusera liquid ready-to-use controls include:
- Blood Gas Control– A liquid stable control provided in easy to open ampoules for added convenience and ease-of-use. Assayed, method specific target values are provided for the most common blood gas instruments.
- Liquid Cardiac Control– This is a highly convenient liquid stable cardiac control offering excellent consistency. Assayed, instrument specific target values are provided for 8 cardiac markers, enabling flexibility and consolidation.
- Liquid Urinalysis Control– Liquid control that is compatible for use with both manual and automated methods of dipstick analysis. Available in convenient 12ml vials or 25ml dropper bottles with assayed ranges provided for 13 parameters covering the chemical examination of urine specimens.
- Liquid HbA1c Control– This is another highly convenient liquid ready-to-use control. With an open vial stability of 30 days, keeping waste and costs to a minimum.
Complementary EQA programmes are also available to meet the needs of ISO 22870.
ISO 22870:2006 in the Point-of-Care Testing (POCT) Market
Point-of-Care Testing (POCT)
The Point-of-Care testing market, better known as POCT, is growing rapidly as the demand for faster patient testing increases. This point is fully backed up through the results of the recent BIVDA (British IN-Vitro Diagnostics Association) survey of 2016. This survey focuses primarily on Point-of-Care Testing and there were a few questions asked that sparked an interest amongst us. The questions can be seen below;
“What are the challenges you face regarding POCT?”
“What do you see in the future for POCT?” (BIVDA, 2016)
Although many answers were put forward there was one (answer) that appeared for both questions. Accreditation. We found this intriguing yet far from surprising. POCT and accreditation go hand-in-hand, with laboratories striving to achieve ISO accreditation with the ultimate aim of allowing patients to have peace of mind that they are being tested properly and effectively.
ISO 22870:2006
The ISO standard that relates to POCT is ISO 22870:2006 Point of Care Testing- Requirements for quality and competence. This standard gives specific requirements applicable to POCT testing and apply when POCT is carried out in a hospital, clinic or a healthcare organisation providing ambulatory care. However, it is important to note and remember that ISO 22870 is not to be seen as a separate, standalone document, in fact, it is to be used in conjunction with ISO 15189:2012 (medical laboratories – particular requirements for quality & competence).
With accreditation in POCT becoming a major factor to laboratories, it is no surprise to see accreditation as one of the top answers to the two questions asked in the survey.
For laboratories looking to participate in point-of-care testing there are other factors of ISO 22870 that they must be aware of, one of the major factors is as follows;
“ISO 22870:2006 advises that where available, Internal Quality Control and participation in an External Quality Assessment (EQA) scheme is required in the point-of-care setting.”
How can Randox help?
Fortunately for laboratories, Randox are able to help out here. With a vast range of true third party controls and 32 comprehensive RIQAS (EQA) programmes, Randox can aid laboratories as they aim for ISO accreditation.
We have multiple products particularly suited to the POCT market including, Liquid Cardiac, Blood Gas and Urinalysis. These products are available both as internal quality controls and as EQA programmes.
Our Acusera range of true third party controls are conveniently supplied liquid ready-to-use, therefore requiring no preparation. This is a particular advantage in the POC environment were test results are required quickly and also were testing is not always performed by laboratory personnel. Supplied with assayed target values and manufactured from 100% human material, ensuring they act in the same manner as a patient sample, our Acusera controls are ideal for use at the point of care and will therefore aid a laboratory in gaining ISO accreditation.
Similarly, participation in our RIQAS EQA programme will also assist laboratories to meet regulatory requirements and achieve ISO accreditation. With over 40,000 laboratory participants in 123 countries, RIQAS is the largest international EQA scheme worldwide! Our Liquid Cardiac, Blood Gas and Urinalysis programmes are all supplied liquid ready-to-use, complementing their Acusera counterparts perfectly!
By using our Acusera controls and RIQAS EQA programmes side by side, a laboratory can confidently aim for ISO accreditation in the knowledge that they are meeting criteria.
