Tracking getting pregnant Using Gestational Age

 

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Most pregnancies will last about 40 weeks when using gestational age to estimate the due date, but anything from 38 weeks to 42 weeks is considered normal. 1  Babies born before 37 weeks are considered premature and those born after 42 weeks considered postmature. Pregnancy Visual Timeline.

Many amazing changes will be happening in your body over the next 40 weeks. Track your baby’s growth using this simple visual timeline. Gestational age is measured from the LMP to the current date in weeks. Most commonly, pregnancies last anywhere from 38 to 42 weeks.

If a baby is born before 37 weeks, she is considered a premature (or preemie) baby. Gestational age is crucial to getting accurate information about your pregnancy, as it is used to predict your baby’s due date. Gestational age (GA) is a common term used to describe the age of a pregnancy. In other words, this is the amount of time that the baby has been in the mother’s belly.

It is measured in weeks, usually by calculating the time difference between the first day of the woman’s last menstrual cycle and the current date. Until about 20 weeks, babies are measured from the crown (or top) of the head to the rump (or bottom). This is because a baby’s legs are curled up against his torso during the first half of pregnancy and very hard to measure. After that, babies are measured from head to toe. A pregnancy wheel is a simple device used by obstetricians and midwives to calculate due dates and gestational age.

A pregnancy wheel may be used throughout pregnancy to track progress and for making prenatal appointments. Enter last menstrual period (LMP), current gestational age (GA), OR expected due date to determine the other two, plus estimated date of conception. When to Use. Patients who are pregnant or may be pregnant.

No additional details found for the Gestational Age calculator. References. No references found for. Gestational Age. Related Calculators.

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“Ultrasound measurement of the embryo or fetus in the first trimester (up to and including 13 6/7 weeks of gestation) is the most accurate method to establish or confirm gestational age” [24].The Society of Obstetricians and Gynaecologists of Canada recommends the earliest ultrasound with a crown rump length equivalent to at least 7 weeks (or 10 mm) should be used to determine the gestational age [28]. Gestational diabetes can make your baby grow larger than normal, or be large for gestational age (LGA). A newborn is considered LGA if the baby’s birth weight is greater than 90 percent of other babies born at the same gestational age. (Macrosomia is another labor complication related to a large baby.).

List of related literature:

Unless the actual date of conception (e.g. if the conception was the result of in vitro fertilization – IVF) is known, then an ultrasound of the fetus should be performed between 8 and 14 weeks of gestation, to accurately establish the gestation and fetal viability (Box 1.3).

“Llewellyn-Jones Fundamentals of Obstetrics and Gynaecology E-Book” by Jeremy J N Oats, Suzanne Abraham
from Llewellyn-Jones Fundamentals of Obstetrics and Gynaecology E-Book
by Jeremy J N Oats, Suzanne Abraham
Elsevier Health Sciences, 2015

Gestational dating may best be done using ultrasound measurements and ignoring menstrual dates.

“Maternal Child Nursing Care E-Book” by Shannon E. Perry, Marilyn J. Hockenberry, Kathryn Rhodes Alden, Deitra Leonard Lowdermilk, Mary Catherine Cashion, David Wilson
from Maternal Child Nursing Care E-Book
by Shannon E. Perry, Marilyn J. Hockenberry, et. al.
Elsevier Health Sciences, 2017

It is sometimes possible to identify the precise date of conception, but if it is not, one should try to estimate the gestational age by carefully documenting the recent menstrual history and, if necessary, date the pregnancy by ultrasound.

“Oxford Textbook of Medicine” by D. A. Warrell, Timothy M. Cox, John D. Firth
from Oxford Textbook of Medicine
by D. A. Warrell, Timothy M. Cox, John D. Firth
Oxford University Press, 2005

Gestational age measurement is an inexact science; the methods currently used, such as the Naegele rule, which assesses gestational age from the first day of the last menstrual period, and ultrasound at 20 weeks’ gestation, are accurate only to 1 to 2 weeks’ gestational age.

“Fanaroff and Martin's Neonatal-Perinatal Medicine: Diseases of the Fetus and Infant” by Richard J. Martin, Avroy A. Fanaroff, Michele C. Walsh
from Fanaroff and Martin’s Neonatal-Perinatal Medicine: Diseases of the Fetus and Infant
by Richard J. Martin, Avroy A. Fanaroff, Michele C. Walsh
Elsevier Health Sciences, 2010

When a health care provider gives an expectant mother a due date, it is typically calculated as 40 weeks from the date of the start of her last menstrual period, roughly 10 to 14 days before the actual date of conception.

“Discovering Nutrition” by Paul M. Insel, R. Elaine Turner, Don Ross
from Discovering Nutrition
by Paul M. Insel, R. Elaine Turner, Don Ross
Jones and Bartlett Publishers, 2006

Assignment of gestational age is most commonly done by sonographic measurement of the fetus or by self-reporting by the patient of the first day of her last menstrual period (LMP).

“Genetic Disorders and the Fetus: Diagnosis, Prevention and Treatment” by Aubrey Milunsky, Jeff M. Milunsky
from Genetic Disorders and the Fetus: Diagnosis, Prevention and Treatment
by Aubrey Milunsky, Jeff M. Milunsky
Wiley, 2011

The dating scan can establish an accurate estimation of the gestational age.

“Arias' Practical Guide to High-Risk Pregnancy and Delivery: A South Asian Perspective” by Fernando Arias, Amarnath G Bhide, Arulkumaran S, Kaizad Damania, Shirish N Daftary
from Arias’ Practical Guide to High-Risk Pregnancy and Delivery: A South Asian Perspective
by Fernando Arias, Amarnath G Bhide, et. al.
Elsevier Health Sciences Apac, 2019

To determine the gestational age, early ultrasonography is most reliable.34-36 A more thorough obstetric history includes determining parity (Table 28-1), which indicates any previous abortions or premature deliveries.

“Trauma Nursing E-Book: From Resuscitation Through Rehabilitation” by Karen A. McQuillan, Mary Beth Makic, Eileen Whalen
from Trauma Nursing E-Book: From Resuscitation Through Rehabilitation
by Karen A. McQuillan, Mary Beth Makic, Eileen Whalen
Elsevier Health Sciences, 2008

Most machines will automatically calculate gestational age based on this measurement.

“Textbook of Adult Emergency Medicine E-Book” by Peter Cameron, George Jelinek, Anne-Maree Kelly, Lindsay Murray, Anthony F. T. Brown
from Textbook of Adult Emergency Medicine E-Book
by Peter Cameron, George Jelinek, et. al.
Elsevier Health Sciences, 2011

Most machines have a preset function that will calculate the gestational age once the CRL measurement is obtained.

“Point of Care Ultrasound E-book” by Nilam J Soni, Robert Arntfield, Pierre Kory
from Point of Care Ultrasound E-book
by Nilam J Soni, Robert Arntfield, Pierre Kory
Elsevier Health Sciences, 2019

Oktay Kutluk

Kutluk Oktay, MD, FACOG is one of the world's foremost experts in fertility preservation as well as ovarian stimulation and in vitro fertilization for infertility treatments. He developed and performed the world's first ovarian transplantation procedures as well as pioneered new ovarian stimulation protocols for embryo and oocyte freezing for breast and endometrial cancer patients.

Mail: [email protected]
Telephone: +1 (877) 492-3666

Biography: https://medicine.yale.edu/profile/kutluk_oktay/
Bibliography: oktay_bibliography

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20 comments

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  • i have a question. My wife as 5weeks 4 days, they have taken ultrasound and given these comments.

    we are in CHINA. So, i converted the lines

    The findings were as follows:

    The length of uterus was 49mm, the anteroposterior diameter was 41mm, and the transverse diameter was 58mm.

    One gestational sac was found in the uterine cavity, with the maximum diameter of 11mm, the gestational sac was inclined to the right cornual horn, the echo of yolk sac can be seen in the horn and no germ is found.

    The mixed echo area is found between the left edge of the gestational sac in the picture, with the size of 34mm x 12mm

    Please see the findings and tell me. Doctor told till 6th week, if the baby not came to the middle then we need to do abortion.

    Please suggest…. i hope everything ok

  • Thank you.
    how about for asian babies esp filipinos. My ob kept saying my baby is small i guess they based it on australia standards

  • My baby is 38 weeks as per the Doctor but today’s Ultrasound report says that the Gestational age is 34 weeks and 5 days. Please help me out to understand the same. Is there some serious issue? We will meet the Doctor after 2 days as she is not in town. Me & my wife is really worried.

  • Hi there. I had my baby GS 21.5mm and GA is 6w and no heartbeat. From my LMP I am supposed to be 9w. Is it bad? I have no symptom of any miscarriages. My health is normal but I am a coffee drinker. Could you give me advise?

  • Your channel is so helpful! I’m currently in my 2nd semester and I have a fluids and electrolytes exam Tuesday u hve so much helpful information on the topic thank u so much for your videos! Prayin I do well on this exam ❤️

  • I had my 31 weeks scan today & baby is measuring 2 weeks behind. Ultrasound during my 28 weeks detected hypoechogenic inserts of microcalcinates. I am very worried what all this means. Please advise

  • I am 33 weeks
    I baby is small size size but every time i go for ultrasound they said ur baby is in small size but growing every time we see. Actually my babay has diaphragmatic hernia it found out on 20 weeks ultrasound its Because of gentics. I am so worried about it.

  • So if I think I’m pregnant an doctors can feel top of fundus by my belly button does that indicate I’m about 18 weeks pregnant as I suspected cause about a month ago he couldn’t feel it

  • I am taking pedi/maternity right now and I just got a 90% on my pedi exam and your videos on renal and musculoskeletal helped me so much! Now I am studying for maternity!

  • I just recently graduated from nursing school and preparing to take my NCLEX. I love your videos! They are so helpful. You are truly a wonderful teacher.

  • You are one of the best teacher, can listen to your lectures all day, I request you to make more review videos for nclex RN… and help me to pass NCLEX RN ����

  • Your videos were an integral part in my studying for the NCLEX. You have a great way of explaining topics! I especially found the lessons you had created about the endocrine topics very useful. Just found out today that I passed in 75 questions! Thank you so much for making these videos because I know they played a huge role in that.:)

  • Just started the second year of my Rn program and I just wanted you to know that I have learned more from your channel than reading any book or power point slides. Your videos are a life saver when I have a skill check off, or when i am attempting something for the first time at clinicals.
    Keep up the awesome work and continue educating millions of new nurses.
    Thanks

  • I remember learning AVA (2 Arteries and 1 vein). Supine hypotension caused by gravid uterus pushing against inferior vena cava when mom lays back for
    Fundal height check. Thanks ��

  • my ob-gyne said my baby is malnourished and behind his age. i’m 27 weeks and his bpl is 28 weeks but his femur and ac measures 25 weeks! should i be worried? she did not advised me to eat more rather gave me vitamins for the baby’s weight. i hope you respond. thank u.

  • I cant thank you enough for putting together a whole playlist for maternal/newborn. I am studying for the NCLEX and it has been a year and a half now since my OB class so I didnt know where to even begin. So thank you for making my studying so much easier!

  • Mam in 24 the week my fetal growth is 8 th percentile is it good,….but doctors says at least 10 th percentile must need please mam reply

  • I am 34weeks and baby measured 31 weeks.. but weight is 1.9kg normal.Doctor told me to take healthy diet. I am worring abt it… will it affect my baby in any other way after born?

  • Hi mam I’m 28wek pregnant but baby shower 25week fumare length all bones growth fall at 10%nd fumare 5%.thiz my second pregnancy fst boy.he is not fine now wht can do to this prblm plzz reply..after birth baby will fine are not I want plzz plzz reply mam

  • Hello. I just wanna ask. What will happen to the baby inside mom’s womb without taking vitamins starting 1st to 7th months.. Thank you.