A set of nested lists containing tables with reference values at different z-scores/centiles for valid gestational ages in days. The list is ordered by acronym first, then by z-score/centile (as available - some Fetal standards only have centile tables).
Source
INTERGROWTH-21st Pregnancy Dating (CRL)
INTERGROWTH-21st Symphysis-Fundal Height standard
INTERGROWTH-21st Fetal Growth standards
Note
Where possible, tables were taken from the online sources here. If not available on the INTERGROWTH-21st website, they were taken from the publications listed here.
References
Papageorghiou AT, Ohuma EO, Altman DG, Todros T, Cheikh Ismail L, Lambert A et al. International standards for fetal growth based on serial ultrasound measurements: the Fetal Growth Longitudinal Study of the INTERGROWTH-21st Project. Lancet 2014, 384(9946):869-79. doi:10.1016/S0140-6736(14)61490-2
Stirnemann J, Villar J, Salomon LJ, Ohuma EO, Lamber A, Victoria CG et al. International Estimated Fetal Weight Standards of the INTERGROWTH-21st Project. Ultrasound Obstet Gynecol 2016, 49:478-486 doi:10.1002/uog.17347
Stirnemann J, Salomon LJ, Papageorghiou AT. INTERGROWTH-21st standards for Hadlock's estimation of fetal weight. Ultrasound Obstet Gynecol 2020, 56(6):946-948 doi:10.1002/uog.22000
Papageorghiou AT, Ohuma EO, Gravett MG, Lamber A, Noble JA, Pang R et al. International standards for symphysis-fundal height based on serial measurements from the Fetal Growth Longitudinal Study of the INTERGROWTH-21st Project: prospective cohort study in eight countries. BMJ 2016, 355:i5662 doi:10.1136/bmj.i5662
Papageorghiou AT, Kennedy SH, Salomon LJ, Ohuma EO, Cheikh Ismail L, Barros FC et al. International standards for early fetal size and pregnancy dating based on ultrasound measurement of crown-rump length in the first trimester of pregnancy. Ultrasound Obstet Gynecol 2014, 44(6):641-48 doi:10.1002/uog.13448
Cheikh Ismail L, Bishop DC, Pang R, Ohuma EO, Kac G, Abrams B et al. Gestational weight gain standards based on women enrolled in the Fetal Growth Longitudinal Study of the INTERGROWTH-21st Project: a prospective longitudinal cohort study. BMJ 2016, 352:i555 doi:10.1136/bmj.i555
Drukker L, Staines-Urias E, Villar J, Barros FC, Carvalho M, Munim S et al. International gestational age-specific centiles for umbilical artery Doppler indices: a longitudinal prospective cohort study of the INTERGROWTH-21st Project. Am J Obstet Gynecol 2021, 222(6):602.e1-602.e15 doi:10.1016/j.ajog.2020.01.012
Rodriguez-Sibaja MJ, Villar J, Ohuma EO, Napolitano R, Heyl S, Carvalho M et al. Fetal cerebellar growth and Sylvian fissure maturation: international standards from Fetal Growth Longitudinal Study of INTERGROWTH-21st Project Ultrasound Obstet Gynecol 2021, 57(4):614-623 doi:10.1002/uog.22017
Napolitano R, Molloholli M, Donadono V, Ohuma EO, Wanyonyi SZ, Kemp B et al. International standards for fetal brain structures based on serial ultrasound measurements from Fetal Growth Longitudinal Study of INTERGROWTH-21st Project Ultrasound Obstet Gynecol 2020, 56(3):359-370 doi:10.1002/uog.21990
Examples
names(gigs::ig_fet)
#> [1] "hcfga" "bpdfga" "acfga" "flfga" "ofdfga" "efwfga" "sfhfga"
#> [8] "crlfga" "gafcrl" "gwgfga" "pifga" "rifga" "sdrfga" "tcdfga"
#> [15] "gaftcd" "poffga" "sffga" "avfga" "pvfga" "cmfga" "hefwfga"
head(gigs::ig_fet$hcfga$zscores)
#> gest_days SD3neg SD2neg SD1neg SD0 SD1 SD2 SD3
#> 1 98 81.1 86.7 92.3 97.9 103.5 109.0 114.6
#> 2 105 92.6 98.5 104.4 110.4 116.3 122.2 128.2
#> 3 112 104.1 110.4 116.6 122.9 129.2 135.5 141.7
#> 4 119 115.7 122.3 128.8 135.4 142.0 148.6 155.2
#> 5 126 127.2 134.1 141.0 147.9 154.8 161.7 168.6
#> 6 133 138.7 145.9 153.1 160.3 167.4 174.6 181.8