Characteristics of improved NOVA magnesium ion-selective electrode: changes of ionized magnesium values and reference interval in healthy children.
Following the report of interference between the thiocyanate ion (SCN-) and NOVA's previous ion-selective electrode (ISE) for ionized magnesium (iMg2+), NOVA has developed a new ISE which eliminates the effect of SCN-. Two hundred and sixty healthy children were divided into two groups; those who had presented when using NOVA's previous ISE (group A; n = 160) and those using NOVA's new ISE (group B; n = 100). The mean iMg2+ value and the mean iMg2+ percent fraction (iMg2+/serum Mg) were significantly higher in group B than in group A (0.59 +/- 0.03 vs 0.54 +/- 0.03 mmol/L for iMg2+; p < 0.001 and 64.8 +/- 3.1 vs 58.2 +/- 4.1 per cent for iMg2+ percent fraction; p < 0.001). The mean serum SCN- level was 0.023 +/- 0.008 mmol/L in group A (n = 8) and 0.0.21 +/- 0.007 mmol/L in group B (n = 12), and was not significantly different between the two groups. The suspected change of iMg2+ value interfered by SCN- was 0.037 mmol/L in group A. The difference of iMg2+ percent fraction between two groups was higher at high serum magnesium (SMg) levels. The reference interval of iMg2+ was 0.56-0.62 mmo/L in healthy children with the NOVA's new ISE, and was constant irrespective of growth. The NOVA's previous iMg2+ ISE may be interfered with mainly by SCN-. The newly designed ISE eliminated these effects especially at higher SMg levels.
Hoshino
K
K
Department of Pediatric Cardiology, Saitama Children's Medical Center, Iwatsuki City, Japan. a0182608@pref.saitama.jp
Ogawa
K
K
Hishitani
T
T
Kitazawa
R
R
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D017736:Ion-Selective Electrodes; D007564:Japan; D008274:Magnesium / Q000097:blood*; D008297:Male; D012016:Reference Values; D013223:Statistics as Topic; D013861:Thiocyanates / Q000378:metabolism
D013861:Thiocyanates; D008274:Magnesium; C031760:thiocyanate