Ketepatan Rumus Risanto untuk Memprediksi Berat Lahir Janin pada Ibu dengan Berat Badan Berlebih

Nadia Mutiara Zahra(1*), Shinta Prawitasari(2), Vicky Admiral Aprizano(3), Muhammad Nurhadi Rahman(4), Risanto Siswosudarmo(5)

(1) Fakultas Kedokteran, Kesehatan Masyarakat, dan Keperawatan, Universitas Gadjah Mada
(2) Departemen Obstetri dan Ginekologi, FK-KMK, Universitas Gadjah Mada
(4) Departemen Obstetri dan Ginekologi, FK-KMK, Universitas Gadjah Mada
(5) Departemen Obstetri dan Ginekologi, FK-KMK, Universitas Gadjah Mada
(*) Corresponding Author


Background: Estimated Fetal Weight (EFW) needs to be as accurate as possible to reflect the actual condition of the fetus for labor-management planning. Risanto’s formula is one of the easy to use formula to estimate fetal weight using fundal height (FH). But, oftentimes, the measurement of fundal height in overweight pregnant mothers is hard to be done precisely due to the thickness of the abdominal subcutaneous fat layer. Therefore, there is a possibility of a decrease in EFW’s accuracy in overweight mothers by using FH measurement.

Objective: To determine the accuracy of Risanto’s formula in estimating fetal weight in overweight mothers.

Method: It was a cross-sectional study nested within research by Aprizano in 2018. Mothers at term pregnancies with body mass index (BMI) >25 kg/m2 from Sardjito and affiliated hospitals were included in the study. The difference between the mean Risanto’s estimated fetal weight (R_EFW) and the mean actual birth weight (ABW) was analyzed using a paired t-test. Later on, the accuracy of R_EFW was analyzed based on the mean absolute percentage error and the number of cases within <5%, <10%, <15%, and <20% absolute percentage error. EFW can be defined as accurate if the mean absolute percentage error is <10% and/or the number of EFW within + 10% from the ABW is >75%.

Results and Discussion: From the 205 research subjects, the mean R_EFW was 3050,49 ± 421,96 gram (ranged from 1995 to 4745 gram), while the mean ABW was 3129,29 ± 406,67 gram (ranged from 1800-4880 gram). Risanto’s formula tends to give a smaller estimation compared to the ABW with the mean difference (∆mean) between the two was 78,8 gram (95% CI: 50,031-107,569 and P=0,000). The mean difference was statistically significant. But, if we convert the ∆mean into a percentage, the mean difference was 2,52%. Other than that, the mean absolute percentage error was 5,8 ± 4,11 %. The number of case within the absolute percentage error of <5%, <10%, <15%, and <20% was 47,3%, 85,9%, 96,6%, and 100% from the overall data in consecutive order.

Conclusion: Risanto’s formula was accurate in estimating fetal birth weight in overweight mothers based on the two indicators, in which the mean absolute percentage error was <10% and the number of cases within the + 10% from the ABW was >75%.


Keywords: Risanto’s formula; estimated fetal weight; overweight mothers; fetal birth weight



rumus Risanto; taksiran berat janin; berat badan ibu berlebih; berat bayi lahir

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