The journal impact factor (IF) is a relatively simple metric, calculated according to the overall number of citations in a given year (i.e. 2017) for articles published in one scientific journal during the previous 2 years (i.e. 2015 and 2016), divided by the overall number of articles published by that same journal in the previous 2 years (i.e. 2015 and 2016) [1]. The aggregate IF for a given subject category can be estimated similarly to the journal IF, and hence considering the overall number of citations for articles published by all journals comprised within the same subject category divided by the overall number of articles published by these journals [2].
Albeit the use of the IF for rating journal prestige remains disputed, as it carries both advantages and drawbacks as discussed elsewhere [3, 4], it cannot be negated that the vast majority of scientists around the world are still influenced by this metric when deciding the most suitable journal for submitting their works, as success in publishing in high IF journals will have an impact on scientific reputation, grants assignment and career progression [5]. It is thus predictable that the influence of the IF will remain resilient for many years to come, mirroring the perceived importance of a journal within and even outside its specific subject category. To put it simple, journals with a higher IF are (and predictably will be) recognized as being more influential than those with a lower IF.
The recent publication of the 2017 Journal Citation Reports (JCR) by Clarivate Analytics has represented another step forward for Clinical Chemistry and Laboratory Medicine (CCLM). With a new IF of 3.556, CCLM confirms his prominent position in the subject category of “Medical Laboratory Technology”, being ranked 7th out of the 30 scientific journals included in this group. Notably, the IF of CCLM has further increased by 3.6% over that of the previous year but, even more impressively, it has also increased by over 88% during the past 10 years (Figure 1). Although both the aggregate IF of the “Medical Laboratory Technology” subject category (r=0.790; p<0.001) and the IF of CCLM (r=0.942; p<0.001) have displayed a highly significant linear increase over time, the progression of CCLM is more pronounced compared to that of its scientific category (Figure 1). This is clearly emphasized by the fact that the IF of CCLM was ~14% lower than the aggregate IF of the “Medical Laboratory Technology” subject category in 2008, whilst it has now become ~44% higher in 2017.

Progression of journal impact factor (IF) for Clinical Chemistry and Laboratory Medicine (CCLM) and of the aggregate IF of the “Medical Laboratory Technology” during the past 10 years.
This important achievement for CCLM is indeed paralleled by a comparable success of the “Medical Laboratory Technology” subject category. Figure 2, which summarizes the progression of the aggregate IF trend of “Geriatrics and gerontology”, “Medical Laboratory Technology”, “Medicine, general and internal”, “Medicine, research and experimental”, “Radiology, Medical Imaging” and “Surgery” during the past 10 years, clearly shows that “Medical Laboratory Technology” has gradually increased its prominence, displaying a steady enhancement, with an overall 12.5% increase compared to the year 2008 that is only second to the category “Surgery” (Figure 2), thus strengthening the important concept that laboratory medicine is a core of science and medicine [6].

Progression of the aggregate IF of the six medical and diagnostic categories during the past 10 years.
Albeit we are still struggling to safeguard the praiseworthiness of our journal from predatory publishers [7], it cannot be denied that the efforts devoted to make CCLM a distinguished journal in the constellation of laboratory medicine are increasingly being rewarded. In particular, we would like to emphasize that we are navigating between Scylla (the search for a valuable IF) and Charybdis (the mission to publish interesting and useful papers for the broader readership of the journal and, in particular, for laboratory professionals). In the accomplishment of this goal, we must really thank all the associate editors, the editorial board members, our reviewers, our contributors, our readers and, last but not least, all the editorial staff of the journal for making it possible to reach this further exceptional achievement.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Employment or leadership: None declared.
Honorarium: None declared.
References
1. Garfield E. Citation analysis as a tool in journal evaluation. Science 1972;178:471–9.10.1126/science.178.4060.471Search in Google Scholar PubMed
2. Lippi G, Mattiuzzi C, Plebani M. Ranking prestige of medical and laboratory technology journals. Clin Chem Lab Med 2015;53:e85–7.10.1515/cclm-2014-1234Search in Google Scholar PubMed
3. Plebani M. Journal impact factor: the debate continues. Clin Chem Lab Med 2013;51:2247–8.10.1515/cclm-2013-0549Search in Google Scholar PubMed
4. Diamandis EP. More discussion on journal impact factor. Clin Chem Lab Med 2013;51:2271.10.1515/cclm-2013-0515Search in Google Scholar PubMed
5. Callaway E. Beat it, impact factor! Publishing elite turns against controversial metric. Nature 2016;535:210–1.10.1038/nature.2016.20224Search in Google Scholar PubMed
6. Lippi G, Plebani M. Laboratory medicine does matter in science (and medicine)… yet many seem to ignore it. Clin Chem Lab Med 2015;53:1655–6.10.1515/cclm-2015-0719Search in Google Scholar PubMed
7. Lippi G, Gillery P, Lackner KJ, Melichar B, Payne DA, Schlattmann P, et al. Scientific publishing in the “predatory” era. Clin Chem Lab Med 2018;56:683–4.10.1515/cclm-2017-1079Search in Google Scholar PubMed
©2018 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Editorials
- Clinical Chemistry and Laboratory Medicine continues to shine brightly in the constellation of laboratory medicine
- The Theranos saga and the consequences
- Innovative approaches in diabetes diagnosis and monitoring: less invasive, less expensive… but less, equally or more efficient?
- Reviews
- Exploring the microbiota to better understand gastrointestinal cancers physiology
- Linking type 2 diabetes and gynecological cancer: an introductory overview
- Mini Reviews
- MicroRNAs as predictive biomarkers of response to tyrosine kinase inhibitor therapy in metastatic renal cell carcinoma
- Salivary biomarkers and cardiovascular disease: a systematic review
- Opinion Paper
- The meteoric rise and dramatic fall of Theranos: lessons learned for the diagnostic industry
- General Clinical Chemistry and Laboratory Medicine
- Uncertainty evaluation in clinical chemistry, immunoassay, hematology and coagulation analytes using only external quality assessment data
- Measurement uncertainty and metrological traceability of whole blood cyclosporin A mass concentration results obtained by UHPLC-MS/MS
- Computer-assisted interventions in the clinical laboratory process improve the diagnosis and treatment of severe vitamin B12 deficiency
- Trueness, precision and stability of the LIAISON 1-84 parathyroid hormone (PTH) third-generation assay: comparison to existing intact PTH assays
- Fibroblast growth factor 23 and renal function among young and healthy individuals
- Optimizing charge state distribution is a prerequisite for accurate protein biomarker quantification with LC-MS/MS, as illustrated by hepcidin measurement
- Quantification of human complement C2 protein using an automated turbidimetric immunoassay
- EE score: an index for simple differentiation of homozygous hemoglobin E and hemoglobin E-β0-thalassemia
- Reference Values and Biological Variations
- Algorithm on age partitioning for estimation of reference intervals using clinical laboratory database exemplified with plasma creatinine
- A simple transformation independent method for outlier definition
- Cancer Diagnostics
- Quantification of vanillylmandelic acid, homovanillic acid and 5-hydroxyindoleacetic acid in urine using a dilute-and-shoot and ultra-high pressure liquid chromatography tandem mass spectrometry method
- Cardiovascular Diseases
- Sialylated isoforms of apolipoprotein C-III and plasma lipids in subjects with coronary artery disease
- Diabetes
- Analysis of protein glycation in human fingernail clippings with near-infrared (NIR) spectroscopy as an alternative technique for the diagnosis of diabetes mellitus
- Letter to the Editor
- Preanalytical errors before and after implementation of an automatic blood tube labeling system in two outpatient phlebotomy centers
- Hemolysis interference studies: freeze method should be used in the preparation of hemolyzed samples
- The curious case of postprandial glucose less than fasting glucose: little things that matter much
- Finding best practice in internal quality control procedures using external quality assurance performance
- Evaluation of the analytical performance of a new ADVIA immunoassay using the Centaur XPT platform system for the measurement of cardiac troponin I
- Reference ranges of the Sebia free light chain ratio in patients with chronic kidney disease
- Antigen excess detection by automated assays for free light chains
- Multiple myeloma and macro creatine kinase type 1: the first case report
- Comparison of five cell-free DNA isolation methods to detect the EGFR T790M mutation in plasma samples of patients with lung cancer
- Can we use a point-of-care blood gas analyzer to measure the lactate concentration in cerebrospinal fluid of patients with suspected meningitis?
- Unstable haemoglobin variant Hb Leiden is detected on Sysmex XN-Series analysers
- Congress Abstracts
- 59th National Congress of the Hungarian Society of Laboratory Medicine
Articles in the same Issue
- Frontmatter
- Editorials
- Clinical Chemistry and Laboratory Medicine continues to shine brightly in the constellation of laboratory medicine
- The Theranos saga and the consequences
- Innovative approaches in diabetes diagnosis and monitoring: less invasive, less expensive… but less, equally or more efficient?
- Reviews
- Exploring the microbiota to better understand gastrointestinal cancers physiology
- Linking type 2 diabetes and gynecological cancer: an introductory overview
- Mini Reviews
- MicroRNAs as predictive biomarkers of response to tyrosine kinase inhibitor therapy in metastatic renal cell carcinoma
- Salivary biomarkers and cardiovascular disease: a systematic review
- Opinion Paper
- The meteoric rise and dramatic fall of Theranos: lessons learned for the diagnostic industry
- General Clinical Chemistry and Laboratory Medicine
- Uncertainty evaluation in clinical chemistry, immunoassay, hematology and coagulation analytes using only external quality assessment data
- Measurement uncertainty and metrological traceability of whole blood cyclosporin A mass concentration results obtained by UHPLC-MS/MS
- Computer-assisted interventions in the clinical laboratory process improve the diagnosis and treatment of severe vitamin B12 deficiency
- Trueness, precision and stability of the LIAISON 1-84 parathyroid hormone (PTH) third-generation assay: comparison to existing intact PTH assays
- Fibroblast growth factor 23 and renal function among young and healthy individuals
- Optimizing charge state distribution is a prerequisite for accurate protein biomarker quantification with LC-MS/MS, as illustrated by hepcidin measurement
- Quantification of human complement C2 protein using an automated turbidimetric immunoassay
- EE score: an index for simple differentiation of homozygous hemoglobin E and hemoglobin E-β0-thalassemia
- Reference Values and Biological Variations
- Algorithm on age partitioning for estimation of reference intervals using clinical laboratory database exemplified with plasma creatinine
- A simple transformation independent method for outlier definition
- Cancer Diagnostics
- Quantification of vanillylmandelic acid, homovanillic acid and 5-hydroxyindoleacetic acid in urine using a dilute-and-shoot and ultra-high pressure liquid chromatography tandem mass spectrometry method
- Cardiovascular Diseases
- Sialylated isoforms of apolipoprotein C-III and plasma lipids in subjects with coronary artery disease
- Diabetes
- Analysis of protein glycation in human fingernail clippings with near-infrared (NIR) spectroscopy as an alternative technique for the diagnosis of diabetes mellitus
- Letter to the Editor
- Preanalytical errors before and after implementation of an automatic blood tube labeling system in two outpatient phlebotomy centers
- Hemolysis interference studies: freeze method should be used in the preparation of hemolyzed samples
- The curious case of postprandial glucose less than fasting glucose: little things that matter much
- Finding best practice in internal quality control procedures using external quality assurance performance
- Evaluation of the analytical performance of a new ADVIA immunoassay using the Centaur XPT platform system for the measurement of cardiac troponin I
- Reference ranges of the Sebia free light chain ratio in patients with chronic kidney disease
- Antigen excess detection by automated assays for free light chains
- Multiple myeloma and macro creatine kinase type 1: the first case report
- Comparison of five cell-free DNA isolation methods to detect the EGFR T790M mutation in plasma samples of patients with lung cancer
- Can we use a point-of-care blood gas analyzer to measure the lactate concentration in cerebrospinal fluid of patients with suspected meningitis?
- Unstable haemoglobin variant Hb Leiden is detected on Sysmex XN-Series analysers
- Congress Abstracts
- 59th National Congress of the Hungarian Society of Laboratory Medicine