检验医学 ›› 2025, Vol. 40 ›› Issue (10): 941-945.DOI: 10.3969/j.issn.1673-8640.2025.10.002

• 论著 • 上一篇    下一篇

离子钙公式法计算结果和离子选择电极法直接测定结果一致性分析

林炜炜, 徐靖嵩, 张乐乐, 李敏, 汪骅()   

  1. 上海交通大学医学院附属仁济医院检验科上海 200127
  • 收稿日期:2024-07-02 修回日期:2025-05-06 出版日期:2025-10-30 发布日期:2025-11-07
  • 通讯作者: 汪 骅,E-mail:renjijywh@shsmu.edu.cn
  • 作者简介:林炜炜,女,1977年生,硕士,副主任技师,主要从事临床生化检验工作。
  • 基金资助:
    国家自然科学基金项目(82472374)

Consistency between calculation results of ionized calcium formula method and direct determination results of ion-selective electrode method

LIN Weiwei, XU Jingsong, ZHANG Lele, LI Min, WANG Hua()   

  1. Department of Clinical LaboratoryRenji Hospital,Shanghai Jiao Tong University School of MedicineShanghai 200127, China
  • Received:2024-07-02 Revised:2025-05-06 Online:2025-10-30 Published:2025-11-07

摘要:

目的 分析离子钙公式计算结果(公式法)和离子选择电极(ISE)法直接测定结果的一致性。方法 收集2023年7—12月上海交通大学医学院附属仁济医院6 148例门诊和住院6患者的总钙、离子钙、总二氧化碳(TCO2)、碳酸氢根离子(HCO3-)、总蛋白(TP)、白蛋白(Alb)、氯离子(Cl-)等项目的检测结果。采用4个公式[自建公式1(多元线性逐步回归法)、自建公式2(自动线性建模)、Forster 1985公式、Nordin 1989公式]计算离子钙结果。比较公式法和ISE法离子钙结果的差异。结果 自建公式1、自建公式2、Forster 1985公式、Nordin 1989公式离子钙计算结果与ISE法均呈正相关(r值分别为0.660、0.659、0.478、0.222,P<0.05)。以ISE法离子钙检测结果为参考,以公式法计算结果的百分偏差在±10%范围内为符合要求。当ISE法离子钙检测结果为0.99~1.40 mmol·L-1时,公式法的符合率最高,由高到低依次为自建公式1(95.93%)、自建公式2(95.52%)、Forster 1985公式(90.78%)、Nordin 1989公式(52.91%)。当ISE法离子钙≤0.98 mmol·L-1时,公式法与ISE法的符合率均<40%,且公式法结果均显著高于ISE法(P<0.001)。当ISE法离子钙≥1.41 mmol·L-1时,公式法的符合率由高到低依次为Forster 1985公式(76.19%)、自建公式2(58.73%)、自建公式1(41.27%)、Forster 1985公式(41.27%),且公式法结果均显著低于ISE法(P<0.001)。结论 当离子钙水平为0.99~1.40 mmol·L-1时,除Nordin 1989公式外,其他3个公式与ISE法的符合率均较高。当离子钙≤0.98 mmol·L-1或≥1.41 mmol·L-1时,公式法与ISE法的差异较大,离子钙实际水平会被高估或低估。

关键词: 离子钙, 离子选择电极法, 自建公式, Forster 1985公式, Nordin 1989公式

Abstract:

Objective To investigate the consistency between the results of the formulas for calculating ionized calcium(formula method) and the direct determination results using ion-selective electrode(ISE) method. Methods The determination results of total calcium,ionized calcium,total carbon dioxide(TCO2),bicarbonate ion(HCO3-),total protein(TP),albumin(Alb) and chloride ion(Cl-) for 6 148 patients in the outpatient and inpatient departments of Renji Hospital Affiliated to Shanghai Jiao Tong University School of Medicine from July to December 2023 were collected. The ionized calcium determination results were calculated using 4 formulas [self-built formula 1(multivariate linear stepwise regression method),self-built formula 2(automatic linear modeling),Forster 1985 formula,Nordin 1989 formula] and compared with ISE method. Results The ionized calcium determination results of self-built formula 1,self-built formula 2,Forster 1985 formula and Nordin 1989 formula were all positively correlated with ISE method(r values were 0.660,0.659,0.478 and 0.222,respectively,P<0.05). Taking the ISE method's ionized calcium determination results as the reference,the compliance threshold of formula method was set as ±10%. When the ISE method's ionized calcium determination results were 0.99-1.40 mmol·L-1,the consistency of formula method was the highest,from high to low,they were self-built formula 1(95.93%),self-built formula 2(95.52%),Forster 1985 formula(90.78%) and Nordin 1989 formula(52.91%). When the ISE method's ionized calcium determination results were ≤0.98 mmol·L-1,the cosistency of formula method was <40%,and the formula method results were higher than that of ISE method(P<0.001). When the ISE method's ionized calcium determination results were ≥1.41 mmol·L-1,the consistency of formula method from high to low were Forster 1985 formula(76.19%),self-built formula 2(58.73%),self-built formula 1(41.27%) and Forster 1985 formula(41.27%),and the formula method results were lower than that of ISE method(P<0.001). Conclusions When the ionized calcium level was 0.99-1.40 mmol·L-1,except for Nordin 1989 formula,the consistency rates of the other formulas with ISE method are all relatively high. When the ionized calcium was ≤0.98 mmol·L-1 or ≥1.41 mmol·L-1,the differences between formula method and ISE method were significant,and the actual level of ionized calcium would be overestimated or underestimated.

Key words: Ionized calcium, Ion-selective electrode method, Self-built formula, Forster 1985 formula, Nordin 1989 formula

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