Research Article

Kesesuaian hasil pengukuran Low Density Lipoprotein Cholesterol menggunakan persamaan Friedewald, Hopkins, dan Homogeneous Enzymatic Colorimetric Assay di RSUP Sanglah, Bali, Indonesia

I Made Dharma Pramana , Ida Ayu Putri Wirawati, Ni Nyoman Mahartini

I Made Dharma Pramana
PPDS 1 Patologi Klinik, Fakultas Kedokteran, Universitas Udayana, RSUP Sanglah, Bali, Indonesia. Email: panmahes25@gmail.com

Ida Ayu Putri Wirawati
Departemen Patologi Klinik, Fakultas Kedokteran, Universitas Udayana, RSUP Sanglah, Bali, Indonesia

Ni Nyoman Mahartini
Departemen Patologi Klinik, Fakultas Kedokteran, Universitas Udayana, RSUP Sanglah, Bali, Indonesia
Online First: April 01, 2021 | Cite this Article
Pramana, I., Wirawati, I., Mahartini, N. 2021. Kesesuaian hasil pengukuran Low Density Lipoprotein Cholesterol menggunakan persamaan Friedewald, Hopkins, dan Homogeneous Enzymatic Colorimetric Assay di RSUP Sanglah, Bali, Indonesia. Intisari Sains Medis 12(1): 71-75. DOI:10.15562/ism.v12i1.842


Background: LDL-C concentration can be obtained by calculation from equations and measurement methods. There are many LDL-C equations, but the most commonly used is the Friedewald equation, and the most recent is the Hopkins equation. This study aims to determine LDL-C measurements' agreement using the Friedewald equation, Hopkins equation, and homogeneous enzymatic colorimetric assay.

Methods: This was a cross-sectional study, from January-February 2020, with 570 samples LDL-C examination results by Friedewald equation, Hopkins equation, and homogeneous enzymatic colorimetric assay divided into 3 groups based on TG levels. Data were analyzed by SPSS version 17 for Windows.

Results: Spearman correlation test found a near-perfect correlation between LDL-C using Friedewald and Hopkins equations to direct examinations with values r =0.921 and r =0.907. Limit of agreement from the Bland-Altman test shows an average of >90% for both equations with direct measurements. Mann-Whitney test showed a significant difference between LDL-C direct measurement and Friedewald equation in Total Group, TG 200-400 mg/dL and TG> 400 mg/dL while for Hopkins equation only in TG group> 400 mg/dL (p<0.05). Based on Total Allowable Error (TAE) analysis, LDL-C from Hopkins equation in TG group 200-400 mg/dL appears to be superior to the Friedewald equation.

Conclusion: Friedewald equation and Hopkins equation give good concordance at TG levels <200 mg/dL while at triglyceride levels 200-400 mg/dL Hopkins equation gives better concordance than the Friedewald equation. At triglyceride levels,> 400 mg/dL Friedewald and Hopkins equations show low accuracy, so it is recommended to use the direct method.

 

Latar Belakang: Konsentrasi low density lipoprotein cholesterol (LDL-C) dapat diperoleh dengan 2 cara yaitu menggunakan perhitungan dengan persamaan dan metode pengukuran langsung (direct). Banyak persamaan perhitungan LDL-C tetapi yang paling umum digunakan adalah persamaan Friedewald dan yang terbaru adalah persamaan Hopkins. Penelitian ini bertujuan untuk mengetahui kesesuaian hasil pengukuran LDL-C menggunakan persamaan Friedewald, persamaan Hopkins dan homogeneous enzymatic colorimetric assay

Metode: Penelitian menggunakan rancangan analitik potong lintang dari bulan Januari-Pebruari 2020 dengan 570 sampel hasil pemeriksaan LDL-C dengan persamaan Friedewald, persamaan Hopkins dan homogeneous enzymatic colorimetric assay yang dibagi 3 kelompok berdasarkan kadar trigliserida (TG). Data dianalisis dengan SPSS versi 17 untuk Windows.

Hasil: Uji statistik Spearman didapatkan korelasi mendekati sempurna antara  LDL-C menggunakan persamaan Friedewald dan Hopkins terhadap pemeriksaan direct dengan nilai r=0,921 dan r=0,907. Limit of agreement dari uji Bland-Altman menunjukkan rata-rata > 90% untuk kedua persamaan dengan pengukuran direct. Uji Mann-Whitney menunjukkan perbedaan bermakna antara LDL-C pengukuran direct dengan persamaan Friedewald pada Kelompok Total, TG 200-400 mg/dL dan TG >400 mg/dL sedangkan untuk persamaan Hopkins perbedaan hasil yang bermakna hanya pada kelompok TG >400 mg/dL (p<0,05). Berdasarkan analisis Total Allowable Error (TAE), LDL-C persamaan Hopkins pada kelompok TG 200-400 mg/dL lebih unggul dari persamaan Friedewald.

Kesimpulan: Persamaan Friedewald dan persamaan Hopkins memberikan kesesuaian yang baik pada kadar TG <200 mg/dL sedangkan pada kadar trigliserida 200-400 mg/dL, persamaan Hopkins memberikan kesesuaian yang lebih baik daripada persamaan Friedewald. Pada kadar TG >400mg/dL persamaan Friedewald dan Hopkins menunjukkan akurasi yang rendah sehingga disarankan untuk menggunakan metode direct.

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