scholarly journals Gestational length assignment based on last menstrual period, first trimester crown-rump length, ovulation, and implantation timing

2016 ◽  
Vol 294 (4) ◽  
pp. 867-876 ◽  
Author(s):  
Amita A. Mahendru ◽  
Charlotte S. Wilhelm-Benartzi ◽  
Ian B. Wilkinson ◽  
Carmel M. McEniery ◽  
Sarah Johnson ◽  
...  
Keyword(s):  
First Trimester ◽  
Menstrual Period ◽  
Last Menstrual Period ◽  
Gestational Length ◽  
Crown Rump Length

scholarly journals OP17.02: Assignment of gestational length based on last menstrual period, first trimester crown-rump length, ovulation and implantation timing

2014 ◽  
Vol 44 (S1) ◽  
pp. 101-101
Author(s):  
A. Mahendru ◽  
C.S. Wilhelm-Benartzi ◽  
S. Johnson ◽  
I.B. Wilkinson ◽  
C.M. McEniery ◽  
...  
Keyword(s):  
First Trimester ◽  
Menstrual Period ◽  
Last Menstrual Period ◽  
Gestational Length ◽  
Crown Rump Length

scholarly journals Effectiveness of first trimester ultrasound screening in reduction of postdated labor induction rate

2021 ◽  
Author(s):  
Saugat Koirala ◽  
Achala Thakur ◽  
Rubina Rai ◽  
Baburam Dixit Thapa ◽  
Ashok Raj Pant
Keyword(s):  
Mode Of Delivery ◽  
First Trimester ◽  
Labor Induction ◽  
Menstrual Period ◽  
Last Menstrual Period ◽  
Ultrasound Screening ◽  
Crown Rump Length ◽  
Induction Rate ◽  
Emergency Cesarean ◽  
First Trimester Scan

Background: The gestational age calculation by ultrasonography (USG) at first trimester is based on crown-rump length is more accurate, less erratic than last menstrual period based dating. Utilization of first trimester based scanning in dating the pregnancy will reduce the labor induction rate and consequently reduce the morbidity related to induction of labor.Methods: A comparative cross-sectional study was done among 314 booked antenatal women visiting department of obstetrics and gynecology, BPKIHS for regular check-up between 37 and 41 weeks of gestation. Expected date of delivery was calculated from crown rump length (CRL) of the first trimester scan for USG group while last menstrual period was taken to calculate expected date of delivery for LMP group and were called for induction at 41 weeks of gestation. The rates of labor induction, emergency cesarean section (CS) among induced group, indication of CS and mode of delivery were compared in both the groups.Results: There was 14% labor induction rate in USG group and 24.2% in LMP (last menstrual period) group and differed significantly (p=0.022). There was no difference in the mode of delivery among participants in either groups. The rate of emergency CS among women undergoing induction of labor was 54.5% and 39.5% respectively for USG and LMP groups (p=0.258). Overall, non-reassuring fetal heart rate was the most common indication for CS in both the groups.Conclusions: The finding suggests first trimester scan among all pregnancies will reduce the post-dated inductions, as well as need of CS. 

scholarly journals Fetal infection resulting from maternal rubella after the first trimester of pregnancy

1980 ◽  
Vol 85 (3) ◽  
pp. 381-391 ◽  
Author(s):  
J. E. Cradock-Watson ◽  
Margaret K. S. Ridehalgh ◽  
Mary J. Anderson ◽  
J. R. Pattison ◽  
H. O. Kangro
Keyword(s):  
First Trimester ◽  
Menstrual Period ◽  
Last Menstrual Period ◽  
Igg Antibody ◽  
True Rate ◽  
Igm Antibody ◽  
Prenatal Infection ◽  
Fetal Infection ◽  
First Trimester Of Pregnancy ◽  
Specific Igg

SUMMARYWe have tried to measure the incidence of prenatal infection in 304 infants whose mothers had had rubella at various times after the first 12 weeks of pregnancy. Two methods of assessment were used: first, serum obtained soon after birth was tested for specific IgM antibody; secondly, serum obtained after the age of eight months was tested for specific IgG. When maternal rubella occurred 12–16 weeks after the last menstrual period specific IgM antibody was detected in 28 out of 50 infants (56%). The proportion fell progressively to 12% after maternal rubella at 24–28 weeks, rose to 19% after rubella at 28–36 weeks and then to 58% when the illness occurred during the last month of pregnancy. In all, IgM antibody was detected in 77 out of 260 infants (29%). The fetus can thus be infected at any time during the second and third trimesters of pregnancy, but the risk varies at different stages.The figures for the prevalence of IgG antibody were greater throughout, because some infants had IgG who had previously lacked specific IgM. After maternal rubella at 12–16 weeks IgG antibody persisted in 22 out of 31 infants (71%). The proportion fell to 28% after rubella at 24–28 weeks and then increased progressively to 94% after rubella during the last month. In all, IgG antibody persisted in 94 out of 190 infants (49%). The true rate of fetal infection probably lies between the rates estimated from the presence of IgM antibody and the subsequent prevalence of IgG.Infants whose mothers had rubella at any time during pregnancy should be examined regularly for possible evidence of damage.

scholarly journals OP34.01: Estimation of onset of pregnancy: crown-rump length, last menstrual period or both?

2010 ◽  
Vol 36 (S1) ◽  
pp. 149-150
Author(s):  
J. Stirnemann ◽  
J. Thalabard ◽  
J. Bernard ◽  
Y. Ville
Keyword(s):  
Menstrual Period ◽  
Last Menstrual Period ◽  
Crown Rump Length

ESTIMATE GESTATIONAL AGE ACCORDING TO FETAL CROWN RUMP LENGTH ON ECHOGRAPHY

2021 ◽  
Vol 62 (6) ◽  
Author(s):  
Tran Danh Cuong ◽  
Nguyen Hai Long ◽  
Ngo Toan Anh ◽  
Nguyen Thi Thu Huong ◽  
Le Pham Sy Cuong ◽  
...  
Keyword(s):  
Prenatal Diagnosis ◽  
Pregnant Women ◽  
Linear Equation ◽  
Gestational Age ◽  
Menstrual Period ◽  
Last Menstrual Period ◽  
Obstetrics And Gynecology ◽  
National Hospital ◽  
Crown Rump Length ◽  
The Mean

Objectives: Development of descriptive table of gestational age (GA) based on fetal crown rump length (CRL) in Vietnam. Methods: This study was conducted at the Center for Prenatal Diagnosis, National Hospital Obstetrics and Gynecology. Gestational age based on the first day of last menstrual period (LMP) ranges from 10 weeks to 14 weeks and 6 days. Pregnant women who are healthy, have regular menstrual periods, have not used hormonal drugs or assisted reproductive methods before. Have ultrasound measured the length of the crown-rump of the embryo based on the mandatory criteria. Data were analysed using SPSS 20.0 software. Results: 1008 singleton fetuses that met criteria, were predicted GA according to LMP. There were 1008 fetal crown rump length recorded. The mean CRL was 59.95 ± 6.79 (mm), the mean gestational age according to KCC was: 12.13 ± 0.75 (weeks). Gestational age was linearly correlated with fetal crown rump length according to the equation: CRL = 6.602+ GAx 4.398 and GA= 8.889 + CRLx 0.54. Conclusion: Gestational age can be calculated based on fetal crown rump length index by linear equation: GA = 8.889 + CRLx 0.54. The equations can be applied to calculate gestational age in ultrasound practice in Vietnam.

Comparison of gestational age at birth based on last menstrual period and ultrasound during the first trimester

2008 ◽  
Vol 22 (6) ◽  
pp. 587-596 ◽  
Author(s):  
Caroline S. Hoffman ◽  
Lynne C. Messer ◽  
Pauline Mendola ◽  
David A. Savitz ◽  
Amy H. Herring ◽  
...  
Keyword(s):  
Gestational Age ◽  
First Trimester ◽  
Menstrual Period ◽  
Last Menstrual Period ◽  
Gestational Age At Birth ◽  
Age At Birth

Dating of pregnancy using last menstrual period, crown-rump length, or second-trimester ultrasound biometry: results from the faster trial

2003 ◽  
Vol 189 (6) ◽  
pp. S134
Author(s):  
Radek Bukowski ◽  
George Saade ◽  
Fergal D Malone ◽  
T.Flint Porter ◽  
David A Nyberg ◽  
...  
Keyword(s):  
Menstrual Period ◽  
Last Menstrual Period ◽  
Second Trimester ◽  
Crown Rump Length
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