Evidence map›Paper›PMID 30980419›Full record

ArticlePrenatal diagnosis2019

Fetal anogenital distance using ultrasound.

Ezra Aydin, Rosemary Holt, Daren Chaplin, Rebecca Hawkes, Carrie Allison, Gerald Hackett, Topun Austin, Alex Tsompanidis, Lidia Gabis, Shimrit Ilana Ziv and 1 more

Abstract read
In one paragraph

Article in Prenatal diagnosis, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed, 2 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

17 citing papers in PubMed, 2 syntheses or guidelines pooled it.

  1. Evaluating Male Fetal External Genital Morphology: A Systematic Review of Sonographic Techniques and Normative Values.Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine · 2026
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

11 authors.

Ezra AydinAutism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK.ORCID 0000-0003-4845-053X
Rosemary HoltAutism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK.
Daren ChaplinThe Rosie Hospital, Cambridge University Hospitals Foundation Trust, Cambridge, UK.
Rebecca HawkesThe Rosie Hospital, Cambridge University Hospitals Foundation Trust, Cambridge, UK.
Carrie AllisonAutism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK.
Gerald HackettThe Rosie Hospital, Cambridge University Hospitals Foundation Trust, Cambridge, UK.
Topun AustinThe Rosie Hospital, Cambridge University Hospitals Foundation Trust, Cambridge, UK.ORCID 0000-0002-8428-8624
Alex TsompanidisAutism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK.
Lidia GabisChild Development Centre, Sheba Hospital, Ramat Gan, Israel.
Shimrit Ilana ZivAutism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK.
Simon Baron-CohenAutism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK.ORCID 0000-0001-9217-2544

Funding

Department of HealthDepartment of Health Senior Investigator Award to Simon Baron-CohenMedical Research CouncilWellcome Trust
6 · The paper itself

Abstract

objectiveThis study measured anogenital distance (AGD) during late second/early third trimester of pregnancy to confirm previous findings that AGD can be measured noninvasively in the fetus using ultrasound and further showed differences in reference ranges between populations.

methodTwo hundred ten singleton pregnancies were recruited at the Rosie Hospital, Cambridge, UK. A 2D ultrasound was performed between 26 and 30 weeks of pregnancy. AGD was measured from the centre of the anus to the base of the scrotum in males and to the posterior convergence of the fourchette in females.

resultsA significant difference in AGD between males and females (P < .0001) was found, replicating previous results with a significant correlation between estimated fetal weight (EFW) and AGD in males only (P = .006). A comparison of AGD using reference data from an Israeli sample (n = 118) and our UK sample (n = 208) showed a significant difference (P < .0001) in both males and females, after controlling for gestational age (GA).

conclusionOur results confirm that AGD measurement in utero using ultrasound is feasible. In addition, there are strong sex differences, consistent with previous suggestions that AGD is influenced by prenatal androgen exposure. AGD lengths differ between the UK and Israel; therefore, population-specific normative values may be required for accurate clinical assessments.

Indexed as

Ultrasonography, PrenatalAdultAnal CanalBody Weights and MeasuresFemaleFetal Growth RetardationFetusGenitaliaGestational AgeHumansIsraelMalePenisPerineumPregnancyScrotum

Identifiers

PMID30980419
PMCPMC6618155

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.