라인을따라 Barozen H의정밀도 (precision) 와정확도 (accuracy) 를포함한제반성능을평가하고, 정확도및적혈구용적률 (hematocrit) 에의한간섭영향을다른 3종의혈당측정기와비교하였다. 재료및방법 1. 대상장비및검체 혈당측정기 Barozen H의정밀도

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1 원저 Lab Med Online Vol., No. 2: 69-76, April 21 임상화학 의료기관용네트워크혈당측정기 BAROZEN H 의성능평가 Performance Evaluation of BAROZEN H, a Networking Blood Glucose Monitoring System for Medical Institutions 이준형 차영주 Jun Hyung Lee, M.D., Young Joo Cha, M.D. 중앙대학교의과대학진단검사의학교실 Department of Laboratory Medicine, Chung-Ang University College of Medicine, Seoul, Korea Background: We evaluated the analytical performance of Barozen H (i-sens Inc., Korea), a new glucometer equipped with networking function for medical institutions, according to the ISO 1197:23 and ISO/DIS 1197:211 guidelines. Methods: We measured the precision of 1 Barozen H glucometers, in terms of repeatability and intermediate precision, and determined their accuracy relative to that of automatic chemistry analyzer AU421 (Beckman Coulter, USA). Three other glucometers-precision PCx (Abbott, USA), Glucocard Sigma (Arkray, Japan), and SureStep Flexx (Johnson & Johnson, USA) were also evaluated, and their accuracies and hematocrit interferences were compared. Results: The standard deviation and coefficient of variation of Barozen H for repeatability and intermediate precision were mmol/l and %, respectively. With respect to accuracy, in accordance with ISO 1197:23 criteria, Barozen H yielded 98.% of results within ±.83 mmol/l or ±2%. Further, per the ISO/DIS 1197:211 criteria, 9.2% of results were within ±.83 mmol/l or ±1%; Barozen H was the only glucometer satisfying the more stringent ISO/DIS 1197:211 criteria. Error grid analysis showed that all results from Barozen H were in zone A, indicating its excellent clinical accuracy. Hematocrit, ranging from 2% to 6% did not cause any significant interference. Conclusions: Barozen H showed excellent analytical performance, and it was the most clinically accurate glucometer tested. It can be expected to provide reliable results satisfying ISO/DIS 1197:211 as well as ISO 1197:23 criteria. Key Words: Blood glucose, Blood glucose self-monitoring, Diabetes mellitus, Glucose oxidase, Hematocrit, Point-of-care systems 서론 당뇨병 (diabetes mellitus) 의치료에있어엄격한혈당관리가제 1 형과제 2 형당뇨병모두에서미세혈관합병증의위험을줄인다는 것이입증되었고 [1, 2], 엄격한혈당관리를위해서는혈당측정기 (glucometer) 를이용한지속적인모니터링이필수적이다. 비록혈 당측정기를통해얻은결과로당뇨병을진단하는것은권장되지 Corresponding author: Young Joo Cha Department of Laboratory Medicine, Chung-Ang University College of Medicine, 12 Heukseok-ro, Dongjak-gu, Seoul 16-7, Korea Tel: , Fax: , chayoung@cau.ac.kr Received: September 12, 214 Revision received: October 27, 214 Accepted: October 27, 214 This article is available from 21, Laboratory Medicine Online This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. 않지만 [3], 입원한당뇨환자의주기적혈당모니터링과저혈당및고혈당으로인한응급상황에서신속한진단을위한현장검사 (point of care testing, POCT) 장비로써혈당측정기의사용은매우유용하다. 혈당측정기 Barozen H (i-sens Inc., Seoul, Korea) 는포도당산화효소 (glucose oxidase) 와바이오센서전극 (biosensor electrode) 을이용하여모세전혈 (capillary whole blood) 의혈당값을측정하여혈장등가값 (plasma equivalent value) 으로결과를보고하며 [4],. µl의적은검체량으로 초만에검사를수행할수있다. 또한의료기관의전산망과통신이가능한네트워크기능을장착하여, 4,건의혈당측정결과와 2,건의정도관리데이터를내부메모리에저장하였다가, universal serial bus (USB) 로전산망에연결되면자동으로결과를전송할수있다. 이와같이자동화된네트워크기능을사용하여, 의료기관은혈당검사의소요시간 (turnaround time) 과사무적오류 (clerical error) 를획기적으로줄일수있다 []. 본연구에서는 ISO 1197:23[6] 과 ISO/DIS 1197:211[7] 가이드 eissn

2 라인을따라 Barozen H의정밀도 (precision) 와정확도 (accuracy) 를포함한제반성능을평가하고, 정확도및적혈구용적률 (hematocrit) 에의한간섭영향을다른 3종의혈당측정기와비교하였다. 재료및방법 1. 대상장비및검체 혈당측정기 Barozen H의정밀도와정확도, 적혈구용적률에의한간섭영향을평가하였다. ISO 1197 가이드라인에따라정밀도는반복성 (repeatability) 과중간정밀도 (intermediate precision) 의두가지방법으로평가하였다. 정확도와적혈구용적률에의한간섭영향은현재국내에서시판중인 3종의외산혈당측정기와비교하였다. 비교평가를위해사용한외산혈당측정기는 Precision PCx (Abbott Diabetes Care, Alameda, CA, USA), Glucocard Sigma (Arkray, Kyoto, Japan), SureStep Flexx (Johnson & Johnson, Rochester, NY, USA) 였다. 반복성및정확도평가에는환자검체를이용하였다. 즉, 212년 7월 3일부터 9월 17일까지중앙대학교병원에내원한외래또는입원환자중당뇨의모니터링이나당뇨병의증으로혈당검사가의뢰되고본연구에서면동의한 12명을대상으로모세혈과정맥혈을각각채혈하였다. 본연구는중앙대학교병원생명윤리심의위원회의승인을받았다. 환자군에는남자 4명, 여자 66명이포함되었고, 28-79세 ( 평균 6세, 표준편차 11세 ) 의연령분포를보였다. 이중명시적으로당뇨병을진단받은사람은 1명 (1형당뇨 1명, 2형당뇨 98명, 임신성당뇨 1명 ) 이었다. 채혈전공복시간은 2-17시간 ( 평균 6.4시간, 표준편차 1.3시간 ) 으로다양하였다. 중간정밀도평가에는제조사에서제공한정도관리물질을사용하였고적혈구용적률에의한간섭영향평가에는정맥혈을이용하였다. 2. 평가방법모든측정은 ISO 1197 가이드라인에따라기온 23± 이내에서이루어졌고, 측정을마칠때까지측정시작시온도의 ±2 범위를유지하였다. 실험에사용한모든스트립은단일로트제품이었고, 평가대상혈당측정기들의정도관리와스트립보관은각제조사의권고에따라수행하였다. 1) 정밀도평가반복성평가를위한검체는 ISO 1197 가이드라인에따라환자에게서채취한정맥혈을사용하여 , , , , mmol/l ( 각각 3-, 1-11, 111-1, 11-2, 21-4 mg/dl) 의 가지농도검체를준비하였다. ISO 1197 가이드라인에따라, 저혈당의검체를만들기위해서일정시간실온에서해당과정 (glycolysis) 을거치고, 고혈당의검체를만들기위해서는 % 포도당생리식염수를일정량첨가하였다. 준비된 가지농도검체를 1대의 Barozen H로각농도별로 1회씩반복측정하여총 회의측정을시행하였으며, 모든측정은 24시간이내에완료하였다. 중간정밀도평가는제조사에서제공한 3가지농도범위의정도관리물질을이용하여 1대의 Barozen H로하루에각농도별 1회씩, 1일간반복측정하여총 3회의측정을시행하였다. 정도관리물질의농도범위는 ,.3-8., mmol/l ( 각각 3-, , mg/dl) 의 3가지농도였다. 2) 정확도평가 ISO 1197:23 및 ISO/DIS 1197:211 에따라총 12명환자의모세혈을 4종의혈당측정기로측정하였다. 혈당측정기의측정치와비교할참고치 (reference value) 는모세혈과함께채취한정맥혈에대한자동화학검사기 AU421 (Beckman Coulter, Brea, CA, USA) 의측정치를이용하였는데, 이는혈당측정의참고법인 hexokinase법으로혈장의혈당을측정하는기기이다. AU421에서측정한참고치를기준으로검체는다음의 7개구간에분포하였으며 2.77 mmol/l ( mg/dl) 이하가 4.% (/12), mmol/l (1-8 mg/dl) 구간이 12.8% (16/12), mmol/l (81-12 mg/dl) 구간이 24.8% (31/12), mmol/l (121-2 mg/dl) 구간이 3.4% (38/12), mmol/l (21-3 mg/dl) 구간이 16.% (2/12), mmol/l (31-4 mg/dl) 구간이 8.% (1/12), 그리고 22.2 mmol/l (4 mg/dl) 초과구간이 4.% (/12) 였다. 이중생리적농도범위를크게벗어나는첫번째구간 (2.77 mmol/l 이하 ) 의다섯개검체와 7번째구간 (22.2 mmol/l 초과 ) 의두검체는 ISO 1197에서허용하는방법대로, 혈당치를조절한정맥혈로모세혈을대체하여평가하였다. 또한 4종혈당측정기의공통측정가능범위 (2- mg/dl) 및공통적혈구용적률허용범위 (2-6%) 를넘어서는 2명의환자검체는평가에서제외하였다. 모세혈의혈당측정에는 4개기종별각 2대씩, 총 8대의혈당측정기를사용하였으며, 매환자마다혈당측정기의측정순서를순환하여측정순서에의한영향을최소화하였다. 이러한방식으로모세혈검체 118개와당농도를조절한정맥혈검체 7개를포함하여총 12개검체를혈당측정기로측정하였고, 혈당측정기기종별로각각 2건의측정결과를얻었다. 혈당참고치는헤파린채혈관에채취한정맥혈을 2, g에서 1분간원심분리하여얻은혈장을 AU421로 2회반복측정한후 7

3 그평균을참고치로정하였다. 각혈당측정기의측정치를혈당참고치와비교하여참고치와의차이, 참고치와의 % 차이를구하였다. 또한 ISO/DIS 1197:211 에제시된방법대로혈당측정기의측정치와참고치를비교하여임상적정확도를평가하는 error grid 분석을실시하였고, consensus error grid의 A, B, C, D, E 개영역에표시하였다 [8]. 3) 적혈구용적률에의한간섭영향평가 ISO/DIS 1197:211 에따라 4종의혈당측정기에대해적혈구용적률에의한영향을평가하였다. 환자에게서얻은정맥혈을원심분리후혈장을추가하거나제거하는방법으로 개구간의적혈구용적률 (2±1%, 3±1%, 4±1%, ±1%, 6±1%) 을갖도록하고, 해당및당첨가과정을통해각각 3개구간의당농도 ( ,.3-8., mmol/l) 를갖도록해서총 1종의검체를준비하였다. 각검체에대해혈당측정기기종별로 1회반복측정하고참고치와의차이를평가하였다. 또한, 각검체의적혈구용적률은자동혈구측정기인 Sysmex XE-21 (TOA medical electronics, Kobe, Japan) 으로측정하였다. 3. 통계분석일반통계분석에는 Microsoft Excel 21 (Microsoft, NY, USA) 소프트웨어를, consensus error grid 분석에는 EP Evaluator Release 1 (Data Innovations, South Burlington, VT, USA) 을사용하였다. 결과 1. 정밀도 반복성과중간정밀도평가결과각농도에서의평균, 표준편차, 변이계수를 Table 1에정리하였다. 환자의정맥혈검체로시행된반복성평가결과. mmol/l (1 mg/dl) 미만의저농도 ( 농도 1, 2) 에서표준편차는각각.11,.1 mmol/l ( 각각 2., 2.7 mg/dl) 이었고,. mmol/l (1 mg/dl) 이상의고농도 ( 농도 3, 4, ) 에서변이계수는각각 3.%, 3.6%, 2.% 였다. 중간정밀도평가결과변이계수는. mmol/l 미만의저농도 ( 농도 1) 에서표준편차는.11 mmol/l (1.9 mg/dl) 였고,. mmol/l 이상의고농도 ( 농도 2, 3) 에서변이계수는각각 3.%, 2.3% 였다. 정밀도평가결과저농도구간에서는표준편차.28 mmol/l ( mg/dl) 미만, 고농도구간에서는변이계수 % 미만의정밀도를보였다. 2. 정확도정확도평가는 ISO 1197:23 과 ISO/DIS 1197:211 의허용기준이달라두가이드라인에서요구하는각각의방법으로결과를평가하였다. 우선 ISO 1197:23 에따르면, 혈당측정기기준당농도 4.2 mmol/l (7 mg/dl) 미만인검체들에서참고치대비오차가 ±.83 mmol/l (±1 mg/dl) 이내인결과는 Barozen H, Precision PCx, Glucocard Sigma 세기종에서는모두 1% 를, SureStep Flexx에서는 97.% 로모든혈당측정기가 9% 이상을만족하였다 (Table 2). 당농도 4.2 mmol/l (7 mg/dl) 이상인검체들에서는참고치대비오차가 ±2% 이내인결과는 Barozen H, Precision PCx와 SureStep Flexx에서는각각 97.7%, 98.2%, 98.6% 의순으로 9% 이상을만족한반면 Glucocard Sigma에서는 94.2% 였다. 전체농도구간에대해서는 Precision PCx와 SureStep Flexx에서는전체결과의 98.4% 가허용오차 (±.83 mmol/l 또는 2%) 이내에분포하는가 Table 1. Precision of Barozen H Repeatability Intermediate precision Level 1 Level 2 Level 3 Level 4 Level Level 1 Level 2 Level 3 Mean (mmol/l) SD (mmol/l) CV (%) Table 2. System accuracy according to ISO 1197:23 Glucometers ±.28 mmol/l <4.2 mmol/l 4.2 mmol/l ±.6 mmol/l ±.83 mmol/l ±% ±1% ±1% ±2% Barozen H 2/3* (83.3%) 29/3 (96.7%) 3/3 (1%) 133/22 (6.%) 189/22 (8.9%) 27/22 (94.1%) 21/22 (97.7%) 24/2 (98.%) Precision PCx 2/32 (78.1%) 32/32 (1%) 32/32 (1%) 9/218 (43.6%) 164/218 (7.2%) 23/218 (93.1%) 214/218 (98.2%) 246/2 (98.4%) Glucocard Sigma 2/27 (74.1%) 27/27 (1%) 27/27 (1%) 13/223 (46.2%) 167/223 (74.9%) 21/223 (9.1%) 21/223 (94.2%) 237/2 (94.8%) SureStep Flexx 16/33 (48.%) 2/33 (7.8%) 32/33 (97.%) 113/217 (2.1%) 171/217 (78.8%) 198/217 (91.2%) 214/217 (98.6%) 246/2 (98.4%) *Number and percentage of acceptable results among all results in each interval. Total

4 장우수한결과를보였고, Barozen H에서는 98.% 로이와유사한결과를보였으나 Glucocard Sigma는 94.8% 로허용기준 9% 를만족하지못하였다. ISO/DIS 1197:211 의강화된정확도허용기준을적용해보면, 기준장비의참고치가. mmol/l (1mg/dL) 미만인검체들에서참고치와의오차가 ±.83 mmol/l (1 mg/dl) 이내인경우는 Precision PCx가 96.7% 로우수하였다 (Table 3). 당농도. mmol/l (1 mg/dl) 이상인검체들에서는참고치와의오차가 ±1% 이내 이어야하는데, Barozen H는 9.8% 의결과가이기준을만족하여평가장비중가장우수하였다. 전체농도구간을종합하였을때 Barozen H는측정결과의 9.2% 가 ISO/DIS 1197:211 허용오차 (±.83 mmol/l 또는 1%) 이내에분포하여유일하게허용기준 9% 를만족하였고, 다른 3종의혈당측정기 Precision PCx, Glucocard Sigma, SureStep Flexx에서는순서대로각각 94.4%, 92.%, 92.4% 의측정결과가허용오차이내에분포하여 9% 허용기준을만족하지못하였다. 각혈당측정기의편차도표 (difference plot) 는 Table 3. System accuracy according to ISO/DIS 1197:211 Glucometers ±.28 mmol/l <. mmol/l. mmol/l ±.6 mmol/l ±.83 mmol/l ±% ±1% ±1% Barozen H 4/6* (7.%) 4/6 (9.%) 6/6 (93.3%) 117/19 (61.6%) 164/19 (86.3%) 182/19 (9.8%) 238/2 (9.2%) Precision PCx 37/6 (61.7%) 3/6 (88.3%) 8/6 (96.7%) 87/19 (4.8%) 14/19 (76.3%) 178/19 (93.7%) 236/2 (94.4%) Glucocard Sigma 37/6 (61.7%) 1/6 (8.%) 6/6 (93.3%) 89/19 (46.8%) 14/19 (76.3%) 174/19 (91.6%) 23/2 (92.%) SureStep Flexx 31/6 (1.7%) 46/6 (76.7%) 4/6 (9.%) 98/19 (1.6%) 12/19 (8.%) 177/19 (93.2%) 231/2 (92.4%) *Number and percentage of acceptable results among all results in each interval. Total 8 8 Barozen H Precision PCx A B 8 8 Glucocard Sigma SureStep Flexx C D Fig. 1. Difference plots of Barozen H and 3 other glucometers. (A) Barozen H, (B) Precision PCx, (C) Glucocard Sigma, (D) SureStep Flexx. The X-axis represents the mean value of the duplicates from the AU421 chemistry analyzer. The Y-axis shows the difference between the result of each glucometer and that of AU421. The dotted lines represent the acceptance criteria of ISO/DIS 1197:211 (±.83 mmol/l and ±1%)

5 Fig. 1과같았다. Error grid 분석에서 consensus error grid를이용한분석결과 Barozen H는분석대상의모든측정치가 A 영역에속하는가장우수한결과를보여주었다 (Fig. 2). 다른기종의경우는 A 영역에속하는측정치가 Precision PCx 98%, Glucocard Sigma 99%, SureStep Flexx 99% 로서, Precision PCx의경우추가로 B 영역을포함해야 99% 이상의측정치가 A 또는 B 영역에포함되어야한다 는허용기준을만족할수있었다 mmol/l (-.1 mg/dl) 였고, 최대양의오차는적혈구용적률 6% 인중간농도검체 (.3-8. mmol/l) 에서 6.3% 였다 (Fig. 3). 따라서, Barozen H의경우적혈구용적률 2-6% 의전구간에서오차는모두허용범위이내로서검체의적혈구용적률에따른영향이크지않았으나, 타사의혈당측정기들은적혈구용적률및당농도에따라허용범위를넘어서는다양한오차를보였다. 고찰 3. 적혈구용적률에의한간섭영향평가 ISO/DIS 1197:211 에따르면적혈구용적률에의한오차는. mmol/l (1 mg/dl) 미만의당농도에서는 ±.6 mmol/l (±1 mg/dl) 미만으로,. mmol/l (1 mg/dl) 이상의당농도에서는 ±1% 미만으로규정되어있다. Barozen H에서관찰된최대음의오차는적혈구용적률 3% 인저농도검체 ( mmol/l) 에서는 혈당측정기의성능을평가하는데있어다양한기준이여러표준화기구들에의해제시되어왔으나 [4], 23년에 International Organization for Standardization Technical Committee (ISO/TC) 212에서발표한 당뇨병관리를위한자가시험용혈당측정기의요건 (In vitro diagnostic test systems - Requirements for bloodglucose monitoring systems for self-testing in managing diabetes Barozen H (mmol/l) Precision PCx (mmol/l) A B Glucocard Sigma (mmol/l) SureStep Flexx (mmol/l) C D Fig. 2. Consensus error grids for Barozen H and 3 other glucometers. (A) Barozen H, (B) Precision PCx, (C) Glucocard Sigma, (D) SureStep Flexx. The X-axis represents the mean value of the duplicates from the AU421 chemistry analyzer. The Y-axis shows the results of each glucometer. The percentage values in the box represent the proportion of results belonging to each zone

6 1 Low Mid High 1 Low Mid High 1 1 Bias in Barozen H - Bias in Precision PCx Hematocrit (%) A Hematocrit (%) B 1 Low Mid High 1 Low Mid High 1 1 Bias in Glucocard Sigma - Bias in SureStep Flexx Hematocrit (%) C Hematocrit (%) D Fig. 3. Interference of the hematocrit in 4 glucometers. (A) Barozen H, (B) Precision PCx, (C) Glucocard Sigma, (D) SureStep Flexx. The X-axis shows the hematocrit (%) for each sample. The Y-axis shows the bias between each glucometer and the AU421 chemistry analyzer as a reference measurement procedure. Each bias was presented in difference (mg/dl) at low glucose concentration (3- mg/dl, mmol/l) and %difference (%) at mid ( mg/dl,.3-8. mmol/l) and high (28-42 mg/dl, mmol/l) glucose concentration. mellitus: ISO 1197) 이표준으로받아들여져왔다 [6, 9]. 국내에서는 27년 11월식품의약품안전처 (Korea Food & Drug Administration, KFDA) 에서 ISO 1197:23 에기반한 혈당측정기성능평가가이드라인 을발표하였다. 그러나최근에는혈당측정기의성능이향상됨에따라더욱정밀하고정확한결과를얻을수있게되었고이에따라혈당측정기의평가기준도강화되는추세이다. 그대표적인예로미국임상생화학회 (The National Academy of Clinical Biochemistry, NACB) 에서는자가혈당측정기의정확도평가허용기준에있어 혈당치. mmol/l (1 mg/dl) 미만에서 ±.83 mmol/l (±1 mg/dl) 이내,. mmol/l 이상에서 ±1% 이내 로이전보다강화된진단검사가이드라인 (Laboratory Medicine Practice Guidelines, LMPG) 을발표했고 [1], ISO에서도 211년이와동일하게성능평가의기준을강화한 ISO 1197의개정초안 (Draft International Standard, ISO/DIS 1197:211) 을발표하였다 [7]. 213년 월에는새로운 ISO 1197:213 이공식적으로승인되고출판되었 는데 [11], 이새로운 ISO 1197:213 가이드라인은 ISO/DIS 1197: 211 개정초안의분석적수행능평가 (analytical performance evaluation) 항목과허용기준을그대로채택하고있다. 정밀도평가에서 Barozen H는저농도구간의표준편차및고농도구간의변이계수가각각.28 mmol/l ( mg/dl), % 미만으로나타났고, 이결과는 ISO 1197:23 을따른이전의다른연구 [12] 와비교해볼때모든농도구간에서더우수하였다. 정확도평가에사용된검체의혈당농도에따른구간배정은 ISO 1197:23 과 ISO/DIS 1197:211 의분류기준이서로다른데, ISO 1197:23 은혈당측정기의측정치를, ISO/DIS 1197:211 은기준장비에서측정한참고치를기준으로구간을배정하도록하고있다. 본연구에서는여러혈당측정기간의비교평가를위해 ISO/ DIS 1197:211 에따라기준장비의참고치를바탕으로검체의농도구간을분류하였다. 정확도평가에있어 ISO 1197;23 을따른이전의다른연구

7 [12] 가있었으나, 혈당측정기의검체로모세혈이아닌정맥혈을사용한점, 2대의혈당측정기의측정치를각각평가하지않고그평균을구해평가한점등에서본연구와는차이가있다. 본연구에서는 ISO 1197:211 가이드라인에서명시된대로환자에게서바로채취한신선모세혈을검사에이용하였고각혈당측정기기종마다 2대씩측정하되그평균이아닌각각의측정치를평가에적용하였다. 정확도평가에서 Barozen H는다른장비들과동일한수준으로 ISO 1197:23 허용기준을만족하였으며강화된 ISO/DIS 1197:211 을적용할경우유일하게허용기준을만족하였다. 혈당측정에있어 error grid 분석기법은 198년대중반 Clarke 등에의해처음도입되었고 2년들어 Parkes 등 [8] 에의해개선된 consensus error grid가제안되었다. 혈당측정기의평가에 error grid 분석이필요한이유는회귀분석의상관계수나오차의절대값또는백분율로성능을판단하는기존의방법이다양한농도에서의측정오차를동일한기준으로분석하고있어서, 혈당농도에따른검사결과의임상적중요도를반영하지못하기때문이다. Consensus error grid의 개오류영역 (zone A, B, C, D, E) 은실제로당뇨환자를진료하고있는 1명의내분비내과의사에의해각영역별오류의중요도가평가되었다. Error grid 분석은측정오차가지니는임상적중요도를환자진료에미치는영향을고려하여평가하였으므로, 혈당측정기의정확도허용범위를벗어나는이상결과 (outlier) 의의미를평가하는데많은도움이된다. 따라서, ISO/DIS 1197:211 부터는 consensus error grid 분석을요구하고있으며측정결과의 99% 이상이 A 또는 B 영역에들어와야한다고명시하고있다. 단, consensus error grid의분석범위는당농도 -3.3 mmol/l (- mg/dl) 이내로한정되어있어, 본연구에서도이범위를벗어나는 2개의측정결과는 error grid 분석에서제외하였다. Consensus error grid 분석결과 Barozen H는 4종의혈당측정기중유일하게모든측정결과가 A 영역에속하였다. 특히 Barozen H 의경우정확도허용범위를벗어났던이상결과들이모두 A 영역에해당하므로, 이들이상결과에의해임상진료방침이변경될위험이없어서, 임상적으로가장정확한결과를보고했다고판단된다. 여러연구에서적혈구용적률이혈당측정기의측정결과에미치는영향을보고하였고 [13, 14], 그영향으로 ISO/DIS 1197:211 부터는적혈구용적률에대한평가가추가되었다. 본연구에서도다양한당농도구간과적혈구용적률에서측정결과에미치는영향을평가하였고 Barozen H의경우그영향이허용기준이내임을확인하였다. 본연구의한계는 ISO/DIS 1197:211 부터도입된 3개이상의스트립로트에대한검증을시행하지못하고 1개의스트립로트만을평가한점을들수있는데, 이는 4종류의혈당측정기를비교평가한관계로말초혈측정횟수에현실적인제한이있었기때문이다. 결론적으로혈당측정기 Barozen H는 ISO 1197:23과 ISO/ DIS 1197:211 의정확도기준을모두충족하는우수한성능을보였다. 새로운 ISO 1197:213 가이드라인이 ISO/DIS 1197:211 의성능요구사항을그대로채택했음을고려할때 Barozen H는기존의 ISO 1197:23 뿐만아니라새로운 ISO 1197:213 의기준을충족하는신뢰할만한결과를제공할것으로기대된다. 요약 배경 : 의료기관용네트워크기능을탑재한혈당측정기 Barozen H (i-sens Inc., Korea) 의분석적성능을 ISO 1197:23 및 ISO/DIS 1197:211 가이드라인에따라평가하였다. 방법 : 1대의 Barozen H의정밀도를반복성및중간정밀도로평가하고, 자동화학분석기 AU421 (Beckman Coulter, USA) 을기준으로정확도를평가하였다. 정확도, 적혈구용적률에의한간섭영향을 3종의외산혈당측정기 Precision PCx (Abbott Diabetes Care, USA), Glucocard Sigma (Arkray, Japan), SureStep Flexx (Johnson & Johnson, USA) 와비교평가하였다. 결과 : Barozen H의반복성및중간정밀도평가결과, 표준편차는 mmol/l, 변이계수는 % 였다. 정확도에있어서 ISO 1197:23 에따라평가했을때, 전체결과의 98.% 가 ±.83 mmol/l 및 ±2% 이내의오차를보여허용기준을만족했다. ISO/DIS 1197:211 에따라평가할경우, 전체결과의 9.2% 가 ±.83 mmol/l 및 ±1% 이내의오차를보여평가대상장비중유일하게, 강화된 ISO/DIS 1197:211 허용기준을만족하였다. Error grid 분석결과모든결과가 A 영역에속하는매우우수한임상적정확도를보였다. 적혈구용적률 2-6% 범위에서, 적혈구용적률에의한의미있는간섭현상은관찰되지않았다. 결론 : Barozen H는우수한혈당분석성능을보였고비교평가한혈당측정기중임상적으로가장정확한결과를보여주었다. Barozen H는기존의 ISO 1197:23뿐만아니라 ISO/DIS 1197:211 기준을만족하는신뢰할만한결과를제공할것으로기대된다. 감사의글 본연구는보건복지부보건의료기술진흥사업의지원에의하여이루어진것임 (A14). 이해관계 저자들은본연구와관련하여해당회사와이해관계가없음

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