Pearce J M, Campbell S
Br J Obstet Gynaecol. 1987 Feb;94(2):100-4. doi: 10.1111/j.1471-0528.1987.tb02333.x.
The clinical efficiency of serial measurement of symphysis-fundal height (SFH) for the prediction of light-for-gestational age (LGA) infants was compared with that of a single measurement of fetal abdominal circumference (AC) by ultrasound in the third trimester. To make the tests comparable the lower cut-off point of AC was altered until the specificity matched that of SFH. The sensitivity of the AC measurement (83%) was slightly better than that of the SFH measurement (76%) but this difference was not statistically significant. Each test had a false positive rate of about 60% which is comparable with clinical assessment. Screening with both tests and predicting LGA with abnormal results from either test improved the sensitivity to 93% but, as expected, decreased the specificity to 67% and the positive predictive value to 32%. If ultrasound facilities permit both tests should be used otherwise SFH measurements only could screen for LGA with ultrasound back-up for those with low SFH results.
将孕晚期连续测量耻骨联合上缘高度（SFH）预测小于胎龄儿（LGA）的临床效率与单次超声测量胎儿腹围（AC）的临床效率进行了比较。为使测试具有可比性，调整AC的下限值，直至其特异性与SFH的特异性相匹配。AC测量的敏感性（83%）略高于SFH测量的敏感性（76%），但这种差异无统计学意义。每项测试的假阳性率约为60%，与临床评估相当。两项测试联合筛查，并根据任一项测试的异常结果预测LGA，可将敏感性提高至93%，但正如预期的那样，特异性降至67%，阳性预测值降至32%。如果具备超声检查设备，两项测试均应采用，否则仅进行SFH测量也可筛查LGA，对于SFH结果较低者，可采用超声检查作为辅助手段。
