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If the ultrasound measurements are in agreement and differ from menstrual dates by more than one week prior to 20 weeks a new estimated due date should be calculated and recorded.
The reduced accuracy of prediction of gestational age after 20 weeks must be appreciated.
But she claims the dye used to improve the clarity of her scans - gadolinium - left her close to death, costing million in out-of-pocket medical fees, and says she has suffered permanent weakness, exhaustion, bouts of pain, cognitive issues and a burning feeling ever since.
Doing an ultrasound to estimate fetal weight near term is a very common practice, one still employed by many OBs, especially with large mothers.
Action star Chuck Norris is suing 11 drug companies that he claims are responsible for poisoning his wife with a chemical used in MRI scanning.
Former model Gena Norris, 54, had three MRI scans in one week five years ago to assess her rheumatoid arthritis.
In most cases, BPD [Biparietal diameter], HC [Head circumference], AC [Abdominal circumference] and FL [Femur length] are used.
Since all of these measurements are strongly related to gestational age, it is not usually important how they are combined.
This should include at least two fetal measurements (usually biparietal diameter (BPD) and femur length (FL)) plus a consideration of additional parameters such as head circumference (HC), occipitofrontal diameter (OFD), abdominal circumference (AC) and humerus length (HL).