K. O. Kagan

2.3k total citations · 1 hit paper
25 papers, 1.5k citations indexed

About

K. O. Kagan is a scholar working on Pediatrics, Perinatology and Child Health, Infectious Diseases and Surgery. According to data from OpenAlex, K. O. Kagan has authored 25 papers receiving a total of 1.5k indexed citations (citations by other indexed papers that have themselves been cited), including 24 papers in Pediatrics, Perinatology and Child Health, 11 papers in Infectious Diseases and 4 papers in Surgery. Recurrent topics in K. O. Kagan's work include Prenatal Screening and Diagnostics (22 papers), Fetal and Pediatric Neurological Disorders (12 papers) and Parvovirus B19 Infection Studies (11 papers). K. O. Kagan is often cited by papers focused on Prenatal Screening and Diagnostics (22 papers), Fetal and Pediatric Neurological Disorders (12 papers) and Parvovirus B19 Infection Studies (11 papers). K. O. Kagan collaborates with scholars based in Germany, United Kingdom and United States. K. O. Kagan's co-authors include K. H. Nicolaides, D. Wright, Jiri Sonek, Amy Baker, Daljit Singh Sahota, Nick Raine‐Fenning, C. M. Bilardo, Ilan E. Timor‐Tritsch, G. S. H. Yeo and T. Ghi and has published in prestigious journals such as Ultrasound in Obstetrics and Gynecology, Fetal Diagnosis and Therapy and Geburtshilfe und Frauenheilkunde.

In The Last Decade

K. O. Kagan

23 papers receiving 1.5k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

ISUOG Practice Guidelines: performance of first‐trimester fetal ultrasound scan

2012 409 citations L. J. Salomon, C. M. Bilardo et al. Ultrasound in Obstetrics and Gynecology profile →

Peers

Countries citing papers authored by K. O. Kagan

Since Specialization

Citations

This map shows the geographic impact of K. O. Kagan's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by K. O. Kagan with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites K. O. Kagan more than expected).

Fields of papers citing papers by K. O. Kagan

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by K. O. Kagan. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by K. O. Kagan. The network helps show where K. O. Kagan may publish in the future.

Co-authorship network of co-authors of K. O. Kagan

This figure shows the co-authorship network connecting the top 25 collaborators of K. O. Kagan. A scholar is included among the top collaborators of K. O. Kagan based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with K. O. Kagan. K. O. Kagan is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

#	Work	Indexed citations
1	Ongoing outbreak of maternal parvovirus B19 infections in Germany since end of 2023: consequence of COVID‐19 pandemic? 2025 ·Ultrasound in Obstetrics and Gynecology ·J Jiménez Cruz, R Axt-Fliedner, Christoph P. Berg, (unknown), K. O. Kagan, (unknown), Alexander Lauten, (unknown), Holger Stepan, M. Tavares de Sousa, Stefan Verlohren, U. Germer, J. Weichert, Brigitte Strizek, Annegret Geipel	2
2	Frontal space distance in facial clefts and retrognathia at 11-13 weeks' gestation 2015 ·Ultrasound in Obstetrics and Gynecology ·Markus Hoopmann, Jiri Sonek, (unknown), C. M. Bilardo, Philipp Wagner, Harald Abele, K. O. Kagan	14
3	How to measure cervical length 2015 ·Ultrasound in Obstetrics and Gynecology ·K. O. Kagan, Jiri Sonek	105
4	ISUOG consensus statement on the impact of non-invasive prenatal testing (NIPT) on prenatal ultrasound practice 2014 ·Ultrasound in Obstetrics and Gynecology ·Laurent Salomon, Žarko Alfirević, François Audibert, K. O. Kagan, D. Paladini, Giles S.H. Yeo, Nick Raine‐Fenning	79
5	Combined First Trimester Screening and Cell-Free Fetal DNA -" Next Generation Screening" Kombiniertes Ersttrimesterscreening und zellfreie fetale DNA -" Next Generation Screening" 2014 ·K. O. Kagan, B. Eiben, P. Kozlowski	5
6	First‐trimester contingent screening for trisomies 21, 18 and 13 by fetal nuchal translucency and ductus venosus flow and maternal blood cell‐free DNA testing 2014 ·Ultrasound in Obstetrics and Gynecology ·K. O. Kagan, D. Wright, K. H. Nicolaides	37
7	ISUOG Practice Guidelines: performance of first‐trimester fetal ultrasound scan breakdown → 2012 ·Ultrasound in Obstetrics and Gynecology ·L. J. Salomon, (unknown), C. M. Bilardo, G. E. Chalouhi, T. Ghi, K. O. Kagan, Tze Kin Lau, Aris T. Papageorghiou, Nick Raine‐Fenning, J. Stirnemann, Suresh Kumar, Ann Tabor, Ilan E. Timor‐Tritsch, Ants Toi, G. S. H. Yeo	409
8	Prefrontal space ratio in second‐ and third‐trimester screening for trisomy 21 2012 ·Ultrasound in Obstetrics and Gynecology ·(unknown), Jiri Sonek, (unknown), Markus Hoopmann, Harald Abele, (unknown), K. O. Kagan	23
9	Frauenärztlich-pädiatrische Kooperation 2011 ·Der Gynäkologe ·K. O. Kagan, Markus Hoopmann	0
10	Intra‐ and interoperator reliability of manual and semi‐automated measurement of fetal nuchal translucency by sonographers with different levels of experience 2010 ·Ultrasound in Obstetrics and Gynecology ·Harald Abele, Markus Hoopmann, D. Wright, (unknown), (unknown), (unknown), D. Wallwiener, K. O. Kagan	25
11	The 11–13‐week scan: diagnosis and outcome of holoprosencephaly, exomphalos and megacystis 2010 ·Ultrasound in Obstetrics and Gynecology ·K. O. Kagan, I. Staboulidou, Argyro Syngelaki, J. Cruz, K. H. Nicolaides	57
12	Prenatal Diagnosis of a Fetus with Terminal Deletion of Chromosome 1 (q43) in First-Trimester Screening: Is There a Characteristic Antenatal 1q Deletion Phenotype? A Case Report and Review of the Literature 2010 ·Fetal Diagnosis and Therapy ·Norbert Wagner, (unknown), Ulrike A. Mau‐Holzmann, (unknown), Markus Hoopmann, Harald Abele, K. O. Kagan	8
13	Effect of deviation from the mid‐sagittal plane on the measurement of fetal nuchal translucency 2010 ·Ultrasound in Obstetrics and Gynecology ·Harald Abele, Norbert Wagner, Markus Hoopmann, E.‐M. Grischke, D. Wallwiener, K. O. Kagan	16
14	Prenatal Diagnosis and Management of a Fetal Intra-Abdominal Teratoma: A Case Report and Review of the Literature 2009 ·Fetal Diagnosis and Therapy ·Norbert Wagner, K. O. Kagan, Steven W. Warmann, Harald Abele, I. Tekesin	4
15	Prospective validation of first‐trimester combined screening for trisomy 21 2009 ·Ultrasound in Obstetrics and Gynecology ·K. O. Kagan, Adolfo Etchegaray, (unknown), D. Wright, K. H. Nicolaides	97
16	Tricuspid regurgitation in screening for trisomies 21, 18 and 13 and Turner syndrome at 11 + 0 to 13 + 6 weeks of gestation 2008 ·Ultrasound in Obstetrics and Gynecology ·K. O. Kagan, Catalina Valencia, (unknown), D. Wright, K. H. Nicolaides	106
17	Frontomaxillary facial angle in screening for trisomy 21 at 11 + 0 to 13 + 6 weeks 2008 ·Ultrasound in Obstetrics and Gynecology ·M. Borenstein, Nicola Persico, K. O. Kagan, (unknown), K. H. Nicolaides	44
18	Screening for trisomy 21 by maternal age, fetal nuchal translucency thickness, free beta‐human chorionic gonadotropin and pregnancy‐associated plasma protein‐A 2008 ·Ultrasound in Obstetrics and Gynecology ·K. O. Kagan, D. Wright, Amy Baker, Daljit Singh Sahota, K. H. Nicolaides	294
19	Management der Mehrlingsschwangerschaft 2008 ·K. O. Kagan, (unknown), (unknown), (unknown), Harald Abele	0
20	First‐trimester ultrasound and biochemical markers of aneuploidy and the prediction of preterm or early preterm delivery 2007 ·Ultrasound in Obstetrics and Gynecology ·Kevin Spencer, Nicholas J. Cowans, Francisca S. Molina, K. O. Kagan, K. H. Nicolaides	87

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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