Ultrasounds: What Is EFBW and GMS?

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Ultrasounds: What Is EFBW and GMS?
Mrs Sheena Ahmed asks
I am almost 5 months pregnant and recently I had an ultrasound which shows an EFBW of 323 GMS. What does this mean?

Thanks for your question and congratulations on your pregnancy. During pregnancy, a number of ultrasounds and scans are carried out to monitor how the pregnancy is growing and the growth of your baby in the womb. Ultrasounds are painless and safe, so it's an ideal method of scanning for pregnancy.

It's standard practice for ultrasounds to be carried out at the stages of three months and five months into pregnancy. Many hospitals provide women with a printed copy of the scan to take home afterwards – often they very clearly show your baby, although other times they could be facing the wrong way, have a limb crossed or be obscuring the face somehow! It's a bit hit and miss when photographing babies in the womb like this, but it's a lovely memento to take home. At the bottom of the scan there are various printed letters and numbers, including EFW and GMS.

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Although it may seem like a slightly strange acronym, EFW actually stands for Estimated Fetal Weight – the current estimated weight of your baby. The second part, in your case 323 GMS, stands for the estimated weight – i.e. 323 grams.

The meaning of this acronym should have been explained to you at the scan (remember, if you are unsure about anything, it's always fine to ask – although it's easy to forget at the time and only think of things later on). The estimated weight is also often given out to mums, although it's usually given in the form of pounds and ounces rather than grams. Pounds and ounces is the form of measurement that babies are traditionally weighed in and it's what most people can understand in terms of baby weight. It's worth bearing in mind, though, that this is very much an estimate at this stage, as the actual weight can vary considerably. In fact, it can vary by about 25%.

Due to the variation in actual birth weight, not all hospitals do give out details of the estimated birth weight, which is why you may not have been told what EFW meant. During the next few months, your baby will be increasing in size and continuing to grow and develop in a variety of ways.

Good Luck With The Rest Of Your Pregnancy!

Your situation may be slightly different. ask a question below ↓ and our editorial team will reply with our advice.

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Ask Baby and Pregnancy a Question
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Sree 03/01/2020 at 11:10 am
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Rt 03/12/2019 at 8:16 am
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Asha 02/12/2019 at 2:23 am
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Mallesh 22/11/2019 at 10:20 am
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singh 26/10/2019 at 12:24 pm
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rhem 15/09/2019 at 6:44 am
i had my ultrasound rhis sept 19 i wonder what is rhis number for efbw 2336 stands fir can you please give me an idea regarding this and his apgar sciring is 8/8

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shafi 09/07/2019 at 12:03 pm
my wife is 16.2 weeks and done early tiffa scan.
E/O an elongated anechoic lesion with minimal internal echogencity noted below stomach bubble.
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Priyanka 01/04/2019 at 11:04 am
Am 25 week 6days pregnant my EFBW 926.99 gms..What's actual weight of the baby it's normal or not
Arti 21/03/2019 at 6:07 pm
I am 20 wks pregnent and myEFBW is showing 319 gms. Tell me it is normal or not? Plz.
Jackcherry 27/02/2019 at 4:34 pm
Please am 20weeks and 5days scan shown that my EFBW is 0.378kg please is it normal?
Meera 29/01/2019 at 3:33 am
Am 36 week pregnant my EFBW 2864 What's actual weight of the baby it's normal or not
Vava 16/12/2018 at 10:59 am
I am 34 weeks pregnant and my EFBW is 2370gms±346gms
Nnn 06/11/2018 at 10:27 am
my efbw is 2647 in ultrasound
So what is the wheat of baby
BabyAndPregnancy Editor 25/06/2018 at 2:57 pm
We can't give individual medical advice, please ask your midwife or GP.
Shona 23/06/2018 at 2:04 pm
I am 21w 1day pregnant and my EFBW is showing 454 gms. It is normal or not? Plz tell me about this query.
Golu 03/04/2018 at 10:35 am
My ultrasound report mention 133GMS approximately. Please tell me my baby is healthy weight and complete details.
shahnefo 05/02/2018 at 11:10 am
my wife 20wks pregnancy'scan shows EFBWT 385gm, plz tell me its normal wt
Iru 11/12/2017 at 2:46 pm
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Swathi 07/12/2017 at 6:15 am
I am 36 weeks pregnant
I had colour Doppler test it shows EFBW equal to 2170 GM's kindly advice
Reji 16/11/2017 at 9:33 am
I am at 38 W 5 Days...I had an Ultra sSound Scan today, EFBW -3384g

I wish to know does this is the current weight or appx weight at delivery.?!
Non 07/11/2017 at 5:06 pm
I am 18 weeks paregnancy and my EFBW is 265 grams is healthy baby weight is it normal plz tell me all the details plz
supriya 10/04/2017 at 8:59 am
I am 16 week pregnant and my E.F.B.W is showing on ultrasound 136 gms .tell me clearly on details please.
kanchu 28/01/2017 at 12:47 pm
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lyn 29/10/2016 at 8:02 am
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rinky 23/09/2016 at 4:45 pm
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Khaye khaye 17/06/2016 at 4:51 pm
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Ruby 16/03/2016 at 3:47 pm
I am pregnant 13. 4 days and mh EFBW is 74 gms is it normal and my FL AC is 14% is it normal plz answer i am very tensed about this
jasmeen 26/09/2014 at 3:35 pm
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