Evidence map›Paper›PMID 33603122›Full record

ArticleScientific reports2021

Gestational age-specific normative values and determinants of serum progesterone through the first trimester of pregnancy.

Chee Wai Ku, Xiaoxuan Zhang, Valencia Ru-Yan Zhang, John Carson Allen, Nguan Soon Tan, Truls Østbye, Thiam Chye Tan

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed, 3 pooled it
5.7field-weighted citation impact, top 4% of its field
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

20 citing papers in PubMed, 3 syntheses or guidelines pooled it, 35 citations in OpenAlex.

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  9. Ectopic pregnancy.Nature reviews. Disease primers · 2024
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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

7 authors at 5 institutions in 2 countries.

Chee Wai Ku *Department of Obstetrics and Gynecology, KK Women's and Children's Hospital, 100 Bukit Timah Road, Singapore, 229899, Singapore. cheewai.ku@mohh.com.sg.
Xiaoxuan Zhang *Duke-National University of Singapore Medical School, 8 College Road, Singapore, 169857, Singapore.
Valencia Ru-Yan ZhangYong Loo Lin School of Medicine, National University of Singapore, NUHS Tower Block Level 11, 1E Kent Ridge Road, Singapore, 119228, Singapore.
John Carson AllenCentre for Quantitative Medicine, Duke-National University of Singapore Medical School, Academia, 20 College Road, Singapore, 169856, Singapore.
Nguan Soon TanLee Kong Chian School of Medicine, Nanyang Technological University, 11 Mandalay Road, Singapore, 308232, Singapore.
Truls ØstbyeDepartment of Community and Family Medicine, Duke University Medical Center, 2200 West Main Street, Durham, NC, 27710, USA.
Thiam Chye TanDepartment of Obstetrics and Gynecology, KK Women's and Children's Hospital, 100 Bukit Timah Road, Singapore, 229899, Singapore.
KK Women's and Children's Hospital · SGNational University of Singapore · SGDuke University Hospital · USNanyang Technological University · SGNational University Health System · SG

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Progesterone is a steroid hormone that is critical for implantation and maintenance of pregnancy, and low levels are associated with higher miscarriage risk. However, little is known about its trajectory during early pregnancy. We sought to determine the gestational age-specific normative values of serum progesterone on a week-by-week basis, and its associated maternal and fetal factors, during the first trimester of a viable low-risk pregnancy. A cross-sectional study was conducted at KK Women's and Children's Hospital from 2013 to 2018. 590 women with a single viable intrauterine low-risk pregnancy, between gestational weeks 5 and 12, were recruited. Serum progesterone showed an increasing trend during the first trimester, with a transient decline between gestational weeks 6-8, corresponding to the luteal-placental shift. Lowest levels were seen at week 7. Maternal age, BMI, parity, gestational age and outcome of pregnancy at 16 weeks' gestation were found to be associated with progesterone levels. Normative values of serum progesterone for low-risk pregnancies would form the basis for future work on pathological levels of serum progesterone that may increase risk of miscarriage. Larger studies are required to validate these normative values, and personalize them to account for maternal age, BMI, parity and gestational age.

Indexed as

AdultCross-Sectional StudiesFemaleGestational AgeHumansMalePlacentaPregnancyPregnancy Trimester, FirstProgesteroneProgesterone

Identifiers

PMID33603122
PMCPMC7893162
OpenAlexW3114972144

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

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.