A Comparative Study between Johnson Formula and Hadlock Formula For Estimating Fetal Weight in Term Gestation
Journal Title: International Journal of Medical Research Professionals - Year 2018, Vol 4, Issue 5
Abstract
Background: Ultrasound study forms a very important tool in present day obstetrics. Accurate assessment of weight by ultrasound examinations is mandatory for obstetric management particularly at term. Methods: A Prospective observational study done on 100 pregnant women who had gravid between 37 to 42 weeks who fulfilled the inclusion criteria was conducted in Department of Obstetrics and Gynecology-Government Medical College, Pali, Rajasthan. EFW was measured at term by sonological formula i.e. Hadlock formula and Johnson’s formula and compared with the actual birth weight. Statistical analysis was done using Z test. Results: The mean birth weight of Hadlock formula is closest to the mean of actual birth weight when compared to that of Johnson’s formula. P value obtained for both the formulae were <0.01, highly significant. The mean error of the Hadlock formula 188gms , Mean error of Johnson 202.148gms. Percentile error of <20% is 77% in Hadlock formula compared to 79% in Johnson’s formula. Conclusion: Mean birth weight of hadlock formula was closest to the mean of actual birth weight when compared to Johnson’s formula. Least mean error was noted in the birth wt between 2.5-3.5 Kg. Johnson’s formula overestimated the weight in SGA fetuses and Hadlock formula underestimated the weight in LGA fetus.
Authors and Affiliations
Meenal Agarwal
Keywords
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- EP ID EP537134
- DOI 10.21276/ijmrp.2018.4.5.063
- Views 85
- Downloads 0
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