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Publicly Available Published by De Gruyter March 19, 2020

The critical role of laboratory medicine during coronavirus disease 2019 (COVID-19) and other viral outbreaks

  • Giuseppe Lippi EMAIL logo and Mario Plebani ORCID logo


Coronavirus disease 2019, abbreviated to COVID-19 and sustained by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is the latest biological hazard to assume the relevance of insidious worldwide threat. One obvious question that is now engaging the minds of many scientists and healthcare professionals is whether and eventually how laboratory medicine could efficiently contribute to counteract this and other (future) viral outbreaks. Despite there being evidence that laboratory tests are vital throughout many clinical pathways, there are at least three major areas where in vitro diagnostics can also provide essential contributions to diagnostic reasoning and managed care of patients with suspected or confirmed SARS-CoV-2 infection. These include etiological diagnosis, patient monitoring, as well as epidemiologic surveillance. Nonetheless, some structural and practical aspects may generate substantial hurdles in providing timely and efficient response to this infectious emergency, which basically include inadequate (insufficient) environment and shortage of technical and human resources for facing enhanced volume of tests on many infected patients, some of whom are with severe disease. Some proactive and reactive strategies may hence be identified to confront this serious healthcare challenge, which entail major investments on conventional laboratory resources, reinforcement of regional networks of clinical laboratories, installation of mobile laboratories, as well as being proactive in establishing laboratory emergency plans.


Coronavirus disease 2019, abbreviated to COVID-19, is the latest biological hazard to assume the relevance of insidious worldwide threat. The responsible pathogen is a virus belonging to the Coronaviridae family, finally defined as “severe acute respiratory syndrome coronavirus 2” (SARS-CoV-2) for high sequence identity (i.e. up to 80%) with the homologous virus which caused the SARS outbreak in 2003 (i.e. SARS-CoV) [1]. At the time of writing this article, SARS-CoV-2 has already infected over 115,000 people in more than 115 different countries, causing nearly 4000 related deaths [2]. Structural analysis shows that SARS-CoV-2 probably derives from a bat SARS-like coronavirus, which has been then transmitted to humans after emergence of mutations in the spike glycoprotein (protein S) and nucleocapsid N protein [3]. The mutation that occurred in the former protein is especially important, whereby viral spike glycoprotein mediates the entrance of the virus into the cell through cell receptor binding and membrane fusion. On the other hand, the N protein regulates the process of viral replication, thus influencing transcription and assembly. Altogether, mutations in these two proteins would then explain the unique characteristics of SARS-CoV-2 compared to the original SARS-CoV, i.e. enhanced infectious potency in humans, combined with relatively mitigated pathogenicity. In support of the former aspect, the effective reproductive number (R; i.e. the average number of secondary cases per infectious case) has been estimated at 2.6 (credibility interval, 2.1–5.1) for SARS-CoV-2 compared to 1.1 for SARS-CoV, whilst the doubling time of the epidemic has also been calculated as 3.6 days (comprised between 1.0 and 7.7 days) compared to approximately 16 days for SARS-CoV [4]. As concerns the mortality, the World Health Organization (WHO) provides daily estimates, which are obviously in progress due to the ongoing epidemics, the last of which attests that the death rate of COVID-19 is ~3.9% in China (3123/80,904) and ~2.4% abroad (686/28,673; e.g. 5.0% in Italy, 366/7375), compared to ~9.6% (774/8098) for SARS and 34.4% for Middle East respiratory syndrome (MERS; 866/2519). Between 8 and 15% (depending on the geographical setting and individual characteristics) of all SARS-CoV-2 positive cases can be classified as severe or necessitating intensive care unit (ICU) admission. Although the mortality rate of COVID-19 seems hence for now lower than that of SARS or MERS, the number of patients needing urgent critical care is remarkably larger than that of the two previous viral outbreaks, and may foster the collapse of local health care.

This is not the first case, nor it will probably be the last that a viral outbreak has become a public health concern, though COVID-19 displays distinctive features compared to previous coronavirus epidemics such as SARS and MERS, in that the pathogenicity of SARS-CoV-2 seems for now lower and the incubation, longer (usually up to 2 weeks), so the risk of contagion is magnified and the number of cases (and deaths) grows exponentially [5], [6]. This is not really surprising if we look at the future mortality projection of the WHO between the years 2016 and 2060 [7], whereby the number of deaths for lower respiratory infections is expected to increase by over 50% during the next 40 years (i.e. from 2.96 to 4.62 million deaths per year). This notable increase in mortality for pneumonia and other lower respiratory infections predictably encompasses also those caused by coronaviruses, as interstitial pneumonia – evolving toward acute respiratory distress syndrome (ARDS) in 10–15% of cases – is the most frequent and severe complication of SARS-CoV-2, which can then be followed by the onset of viral sepsis, disseminated intravascular coagulation (DIC) and multiorgan failure (MOF) [8], [9].

One obvious question that arises here is whether, and eventually how, laboratory diagnostics could efficiently contribute to counteract this and other (future) viral outbreaks. Despite there being clear evidence that laboratory tests are vital for improving the care and/or maintaining the wellness of people [10], there are at least three areas where in vitro diagnostics can provide essential contributions to the diagnostic reasoning and managed care of patients with suspected or confirmed SARS-CoV-2 infection, as summarized in Figure 1, and discussed in the following parts of this article.

Figure 1: The essential role of laboratory diagnostics in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection.RT-PCR, reverse transcription-polymerase chain reaction.
Figure 1:

The essential role of laboratory diagnostics in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection.

RT-PCR, reverse transcription-polymerase chain reaction.

Etiological diagnosis

The etiological diagnosis of SARS-CoV-2 is the first and most obvious setting where laboratory diagnostics plays an essential role. Both the WHO and the US Centers for Disease Control and Prevention (CDC), along with other national and international scientific organizations, have timely released detailed information for in-house development of reverse transcription-polymerase chain reaction (RT-PCR) tests, which have hence been straightforwardly implemented by many reference laboratories worldwide [11], and are now undergoing clearance by many regulatory agencies.

A crucial aspect that shall be underscored here is the need for developing rapid and effective communication among distant laboratories and research centers. The enormous diffusion of this virus, with positive cases identified in over 115 worldwide countries and in almost every continent, highlights the vital need for developing diagnostic workflows even in the lack of physical sources of viral genomic nucleic acid, whereby the chance that outbreaks will spread to distant countries and become pandemic diseases is increasingly more likely, as recently demonstrated by COVID-19. Notably, the willingness of Chinese scientists to rapidly share genomic information has enabled to develop RT-PCR assays even before SARS-CoV-2 started to circulate in many countries, thus providing a timely and effective diagnostic response to a probable health crisis [12].

Nevertheless, as the ample volume of tests needed to face a large outbreak such as that sustained by SARS-CoV-2 overcomes the throughput capacities of single facilities, whilst shipment of samples toward reference laboratories is an important cause of diagnostic delays, the availability of commercial diagnostic kits in peripheral centers shall be part of the strategy for early and accurate identification of the largest possible number of infected patients. Despite the obvious emergency to promptly develop efficient diagnostic tools, a thorough analytical and clinical validation of commercial RT-PCR tests before their introduction into the market and usage in clinical laboratories remains indispensable. Otherwise, the risk of generating false-negative (or positive) test results may undermine the huge efforts made by healthcare authorities for containing the outbreak. This risk is tangible, as clearly highlighted by a recent publication showing that some patients with clinically evident SARS-CoV-2 disease had initial negative RT-PCR test results, which then turned to be positive at a later stage [13]. Availability of licensed diagnostic kits and uniformity of testing protocols across different nations are other important aspects for providing a clear and reliable epidemiologic picture. Despite the communication channels with China remaining opened all around the world for weeks after the initial outbreak in Wuhan, public governments and national health authorities have set rather heterogeneous testing protocols, occasionally too ample, and often too narrow. For example, South Korea had carried out over 65,000 tests as of February 28, 2020, whilst the CDC has only analyzed less than 500 samples in the US according to a recent update published by Jon Cohen in the journal Science. A direct comparison between these two countries would hence be unrealistic and might jeopardize the attainment of a reliable global epidemiologic picture.

Patient monitoring

The second essential contribution that laboratory medicine could provide in the diagnostics of 2019-nCoV infection encompasses staging, prognostication and therapeutic monitoring of COVID-19. Not only RT-PCR tests will be vital for verifying the course of the infection, as well as the possible presence and extent of viremia, but many other laboratory tests may help assessing disease severity and predicting the risk of evolution toward ARDS, DIC and/or MOF. A systematic literature review, which has recently been published [14], has highlighted the most important abnormalities observed in patients with COVID-19, mostly encompassing lymphopenia, increased values of C reactive protein (CRP), lactate dehydrogenase (LDH), erythrocyte sedimentation rate (ESR) and D-dimer, along with diminished concentration of serum albumin. Even more importantly, a number of hematological parameters were also found to predict progression toward severe or critical forms of COVID-19, including leukocytosis, neutrophilia and lymphopenia. In addition, an innovative parameter called MDW (monocyte volume distribution width – DxH 900 hematology analyzer, Beckman Coulter, Brea, CA, USA) was found to be significantly increased in all COVID-19 patients, especially those with worst clinical conditions (personal data, not shown). For prognostication purposes, also increased values of LDH, aspartate aminotransferase (AST), alanine aminotransferase (ALT), total bilirubin, creatinine, cardiac troponins, D-dimer, prothrombin time (PT), procalcitonin and CRP, together with decreased values of serum albumin, have been found of value.

The importance of hemostasis tests has then been emphasized in another study [15], including 94 patients with COVID-19, and showing that PT and D-dimer are significant predictors of disease severity. This finding not only supports the pivotal role of hemostasis testing in severe and/or systemic infectious diseases [16], but also confirms that consumption (disseminated) coagulopathy may be one of the most severe complications of patients with COVID-19. These figures have also been confirmed in a subsequent study, which pooled data of 1099 patients with laboratory-confirmed SARS-CoV-2 infection from 552 hospitals in 30 Chinese territories [17], demonstrating that COVID-19 patients have lymphopenia (83.2%), thrombocytopenia (36.2%), increased values of CRP (60.7%), LDH (41.0%), AST (22.2%), ALT (21.3%) and D-dimer (43.2%). In keeping with previous findings, the most predictive parameters of severe COVID-19 disease were lymphopenia (96.1% vs. 80.4%; odds ratio [OR], 5.96; 95% confidence interval [CI], 2.58–13.75), thrombocytopenia (57.7% vs. 31.6%; OR, 2.96; 95% CI, 2.07–4.22), leukocytosis (11.4% vs. 4.8%; OR, 2.54; 95% CI, 1.43–4.52), increased values of CRP (81.5% vs. 56.4%; OR, 3.40; 95% CI, 2.15–5.40), procalcitonin (13.7% vs. 3.7%; OR, 4.14; 95% CI, 2.06–8.33), LDH (58.1% vs. 37.2%; OR, 2.13; 95% CI, 1.45–3.14), AST (39.4% vs. 18.2%; OR, 2.92; 95% CI, 1.97–4.34), ALT (28.1% vs. 19.8%; OR, 1.59; 95% CI, 1.04–2.43) and D-dimer (59.6% vs. 43.2%; OR, 1.94; 95% CI, 1.27–2.97), whilst the median hemoglobin value was also found to be lower in patients with severe COVID-19 (128 vs. 135 g/L; p<0.01). Each of these prognostic parameters retain a specific clinical and biological significance, which, altogether, can contribute to reflect the evolution toward more unfavorable clinical pictures (Table 1).

Table 1:

Potential clinical and biological significance of abnormal laboratory values in patients with coronavirus disease 2019 (COVID-19).

Laboratory parameterPotential clinical and biological significance
LymphopeniaDecreased immunological response to the virus
LeukocytosisBacterial (super)infection
NeutrophiliaBacterial (super)infection
Increased value of MDWSevere viral infection/viremia/viral sepsis
ThrombocytopeniaConsumption (disseminated) coagulopathy
Increased value of CRPSevere viral infection/viremia/viral sepsis
Increased value of procalcitoninBacterial (super)infection
Increased value of LDHPulmonary injury and/or widespread organ damage
Increased value of aminotransferasesLiver injury and/or widespread organ damage
Increased value of bilirubinLiver injury
Increased value of creatinineKidney injury
Increased value of cardiac troponinsCardiac injury
Decreased value of albuminImpairment of liver function
Prolongation of prothrombin timeActivation of blood coagulation and/or disseminated coagulopathy
Increased value of D-dimerActivation of blood coagulation and/or disseminated coagulopathy
  1. CRP, creactive protein; LDH, lactate dehydrogenase; MDW, monocyte volume distribution width.


A third, though not less, essential support given by diagnostic testing to counteracting viral outbreaks is the identification of anti-SARS-CoV-2 antibodies, both immunoglobulin G (IgG) and M (IgM). Although serology testing cannot be typically advocated as a reliable surrogate of RT-PCR for diagnosing acute viral infections, it maintains an essential role for both investigational and surveillance purposes [18]. Notably, a combined IgM-IgG rapid immunoassay has also been recently developed, which is apparently characterized by better diagnostic accuracy (i.e. up to 89% sensitivity and up to 91% specificity) than either IgM or IgG test alone [19]. Widespread application of this and other rapid serological tests may hence enable to gain valuable epidemiological data in the fight against this viral epidemic.

Organizational issues

The impact on laboratory organization is another essential aspect that needs to be clearly acknowledged when facing large outbreaks like that sustained by SARS-Cov-2. With several thousands of infected patients, with part of them needing diagnostic testing and/or hospitalization, the daily activity of clinical laboratories for both routine and urgency testing may be rapidly saturated or even overwhelmed and disrupted, whereby the role of medical laboratory services is expected to be mainly reactive rather than proactive. Clinical laboratories, even the most recently constructed, have been designed and organized to sustain a limited (i.e. “customized”) volume of tests [20], so recruiting human and technical resources for facing unexpected health crises would not be so easy at the down of the third millennium. Laboratory automation, availability of high-throughput instrumentation [21], along with lower number of employees and reduced healthcare funding (especially for public facilities) have all contributed to considerably reduce the flexibility to develop emergent responses [22]. The availability and extended use of point-of-care testing (POCT) devices shall be regarded as an additional useful tool during outbreaks and other biological hazards, especially those sustained by viral infections [23], [24].

The lesson learnt from the recent outbreak in China is indeed paradigmatic, whereby the currently available healthcare resources were totally insufficient to manage the impressive number of patients seeking care in Wuhan. The situation has forced public authorities to rapidly build an entirely new 645,000-square-foot hospital, with approximately 1000 beds, ICUs, isolation wards and even a clinical laboratory inside. This is indeed a valuable strategy, but not all worldwide countries would be able to react in such a rapid and efficient manner, i.e. building new facilities in less than 2 weeks. Therefore, additional strategies shall be envisaged. The first and perhaps most important lesson that policymakers and hospital administrators shall learn from COVID-19 is that continuing to cut down human and economic resources will then generate huge organizational issues when the entire system of care, including laboratory diagnostics, will be challenged by an enormously amplified volume of tests to manage emergent situations [25]. A second important aspect is deciding how this and other emergencies could be efficiently managed (Figure 2).

Figure 2: Laboratory preparedness to face emerging outbreaks.
Figure 2:

Laboratory preparedness to face emerging outbreaks.

Existing laboratories may be asked to enhance their usual throughput and contextually reduce their turnaround time, but this may not be sustainable always and anywhere. Urgent personnel recruitment for managing an enhanced volume of serological or molecular tests will be needed, and shall be arranged as soon as possible considering that hands-on training is necessary for those who lack direct experience or skills in virological assays. Healthcare staff may also be temporarily moved from one laboratory to another (e.g. from a biochemistry to a virology laboratory), and this may have an impact on the efficiency of the former facility to maintain the usual throughout and turnaround time for routine and urgent non-virological tests.

Therefore, establishment of an efficient network of regional clinical laboratories, involving those which are not directly challenged by the outbreak and where samples can be conveyed, is a feasible solution, provided that a straightforward regulation for specimen transportation and biosafety is set and monitored (Figure 2). This, in turn, highlights an unavoidable need to place major efforts for allowing better and wider harmonization of laboratory results and information, encompassing both analytical and extra-analytical issues [26], [27], [28].

The creation of new facilities (as in Wuhan) within already existing buildings, in transportable rigid structure (e.g. trucks or caravans), as well as in tents or shelters, is another valid alternative. These new facilities shall obviously be constructed as nearby as possible to the clinical wards, ICUs and emergency departments, so that preanalytical requirements (especially those concerning sample transportation) will fulfill minimum quality requirements [29]. Laboratory professionals may also be made available on-site, where they could help defining standard operating procedures (SOPs) for specimen collection and transportation. The choice between these possible solutions will obviously depend on many economic, legislative, juridical, logistical, environmental and technical issues.

A clear and bulletproof safety policy shall also be instructed and communicated to the laboratory staff, encompassing all those measures that need to be established for preventing the health risks caused by the microorganism causing the outbreak. Two final aspects that shall be clearly acknowledged include the possibility that the healthcare staff may be directly infected by the virus [30], along with the safety measures established by local authorities, which may limit human movements and derange public transportation [31]. Both these aspects may contribute to substantially magnify the shortage of staff inside and outside the laboratory during the outbreak, and lead the way to a final consideration about the compelling need to develop national plans for emergency preparedness, which not only encompass all the previously discussed aspects, but also consider to invest more money in temporary stationary laboratory facilities, equipped with all the necessary instrumentation and with trained personnel, which could be rapidly transported to the site of emergency for supporting local testing needs. Last but not least, it is essential that the laboratory personnel be instructed to communicate test results to the appropriate stakeholders (i.e. to the people who are officially in charge of dealing with the outbreak), thus avoiding to spread information that could generate unjustified panic, or inappropriate reassurance, among the general population [32].


The managed care of patients with SARS-CoV-2 infection entails early identification, rapid isolation, timely establishment of infection prevention and control (IPC) measures, together with symptomatic care for patients with mild disease and supportive treatment for those with severe COVID-19. Several lines of evidence attest that previous viral outbreaks may have been characterized by retarded identification and delayed healthcare response [33], and COVID-19 shall not be considered an exception to this rule [34]. Awareness and preparedness to face highly contagious viral outbreaks, such as that sustained by SARS-CoV-2, become imperative for preventing the health system from being strained and laboratory services from collapsing. Irrespective of its inherent definition [10], it is now virtually incontestable that laboratory medicine will increasingly provide an essential contribution to the diagnostic reasoning, managed care and therapeutic monitoring of the vast majority of human diseases [35], thus including infectious diseases [36], [37] and COVID-19 (Figure 1), which has now been defined as global health emergency by the WHO.

Corresponding author: Prof. Giuseppe Lippi, Section of Clinical Biochemistry, Department of Neuroscience, Biomedicine and Movement, University of Verona, Piazzale L.A. Scuro, 10, 37134 Verona, Italy, Phone: 0039-045-8122970, Fax: 0039-045-8124308

  1. Research funding: None declared.

  2. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  3. Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.


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Received: 2020-03-03
Accepted: 2020-03-04
Published Online: 2020-03-19
Published in Print: 2020-06-25

©2020 Walter de Gruyter GmbH, Berlin/Boston

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