2nd Trimester

Edge of normal humerus and femur bone lengths

fern39fern39 member
edited January 31 in 2nd Trimester
Hello. The anatomy ultrasound at 21 weeks showed humerus and femur lengths at the 13th percentile while the head and abdomen were around 48th to 50th percentile. Baby is 28th percentile overall. The technician didn't mention anything about the discrepancy. I called my doctor and was told by the assistant that my doctor has seen the results and there are no comments in her notes about it so the doctor must think everything is normal. My next appointment with her is in 5 days. I'm scheduled for a follow up ultrasound at 32 weeks because my placenta is low lying. If there is a growth problem with the arms and legs I would like to know sooner than 32 weeks.
Has anyone else had similar results from their scans and how did it go? Were you scheduled more frequent follow up scans to monitor progress? FYI I'm 5'4" and my partner is 5'8" so we're on the small side. 

Thanks for reading and for any thoughts you can share. I've been really worried and googling stuff has not been helping...

Re: Edge of normal humerus and femur bone lengths

  • I wouldn't worry about it at all, especially if your doctor is not worried. Tbh the difference in the percentiles at this stage is actually quite tiny -- I googled fetal growth chart for femur length, and the difference between the 5th percentile and the 95 percentile is 9mm. A difference of literally millimeters means that the technician doing the measurement could literally swing the percentile by a lot by just the tiniest of clicks.
  • fern39fern39 member
    edited February 1
    @lizzzy217 Thanks 🙏 
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  • Update: saw the doctor and she was very dismissive and didn't go over the report with me, just said it's within normal. I asked for a copy and reviewed it after work and saw very low percentiles for FL/BPD, FL/HC, FL/AC, 2%, 5%, and 5% respectively. I'm frustrated the doctor didn't go through the whole report with me and that I didn't have a copy before the appointment. I don't understand why the doctor didn't tell me about these numbers?

    Anyone else had those ratios showing such low percentiles?
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