Transport of vitamin D sterols in human plasma: effect of excess vitamin D, 25 hydroxyvitamin D and 1,25 dihydroxyvitamin D

Abstract. Vitamin D and its more active metabolites, 25 hydroxyvitamin D (25-OH-D) and 1,25-dihydroxy-vitamin D (1,25-(OH)₂-D), are transported in human plasma on a specific binding protein (DBP), which has been shown to have an α-globulin electrophoretic mobility. Since the concentration of DBP in normal human plasma is approximately 5 μmol/l, whereas that of all the vitamin D metabolites is less than 0·2 μmol/l, DBP is less than 3% saturated under physiological conditions. We have studied the transport of the above-mentioned metabolites in human plasma in vitro at normal and saturating concentrations. Human plasma was incubated with increasing amounts of vitamin D metabolites together with their radiolabelled tracers. Ultracentrifugation was used to isolate plasma lipoproteins (density, d < 1·21 g/ml) and agarose gel electrophoresis of lipoprotein-free plasma (d > 1·21 g/ml) to separate DBP (α globulin) from albumin. The recovery of the tracer in plasma proteins was always more than 80%. At physiological concentrations [³H]25-OH-D bound almost exclusively to DBP (98%), [³H]vitamin D or [¹⁴C]vitamin D bound both to DBP and to lipoproteins (40%), and [³H]1,25-(OH)₂-D bound to DBP (62%), to lipoproteins (15%) and also to albumin (23%). When the concentration of vitamin D metabolites was increased, DBP became saturated. The binding capacity of DBP was similar for all three sterols, about 5 μmol/l plasma, or one mole of sterol per mole of protein, but the saturating concentration was different for the three sterols (vitamin D > 1,25-(OH)₂-D > 25-OH-D). 25-OH-D had the greatest affinity for DBP, and it completely displaced both vitamin D and 1,25(OH)₂-D from DBP at higher concentrations. All sterols bound to both plasma lipoproteins and albumin: vitamin D preferentially to lipoproteins and both 25-OH-D and 1,25-(OH)₂-D to albumin. A similar binding pattern for vitamin D in plasma was observed previously by us in a child with vitamin D toxicity. The increased binding of vitamin D to lipoproteins and especially to albumin may help explain the pathogenesis of toxicity in hypervitaminosis D, where the plasma levels of the more active metabolites are insufficient to account for the clinical signs.     

Simultaneous quantification of vitamin D3, 25-hydroxyvitamin D3 and 24,25-dihydroxyvitamin D3 in human serum by LC-MS/MS

Abstract

Introduction. Serum 25-hydroxy-vitamin D is the established biomarker of vitamin D status although serum concentrations of vitamin D and 24,25-dihydroxyvitamin D may also be of interest to understand the in vivo kinetics of serum 25-hydroxyvitamin D. Method. An LC-MS/MS method was developed and validated to quantify vitamin D₃, 25-hydroxyvitamin D₃ and 24,25-dihydroxyvitamin D₃ in serum. After protein precipitation of the serum it was loaded on a HybridSPE column to separate vitamin D metabolites from phospholipids. Vitamin D₃, 25-hydroxyvitamin D₃ and 24,25-dihydroxyvitamin D₃ in the eluate were derivatized by 4-phenyl-1,2,4-triazoline-3,5-dione to improve sensitivity in the following LC-MS/MS analysis. Results. Using only 100 μL serum the limit of quantification was < 0.2 ng/mL for vitamin D₃, 25-hydroxyvitamin D₃ and 24,25-dihydroxyvitamin D₃. The method was validated up to 100 ng/mL (260 nmol/L) for vitamin D₃, up to 100 ng/mL (240 nmol/L) for 24,25-dihydroxyvitamin D₃ and up to 200 ng/mL (499 nmol/L) for 25-hydroxyvitamin D₃. Precision was < 6.5% for vitamin D₃ and 25-hydroxyvitamin D₃ and < 10.2% for 24,25-dihydroxyvitamin D₃. Conclusion. We demonstrate that a method including not only serum 25-hydroxyvitamin D₃ but also vitamin D₃ and 24,25-dihydroxyvitamin D₃ could easily be implemented in most modern biochemical laboratories. The method could be used to study the metabolism of endogenous synthesized vitamin D₃ as well as vitamin D₃ in intervention studies.     

绝经后女性血清鸢尾素、25羟维生素D水平与骨代谢、骨质疏松的相关性

目的观察绝经后女性血清鸢尾素(Irisin)、25羟维生素D [25(OH)D]水平与骨代谢、骨密度(bone mineral density,BMD)、骨质疏松的相关性。方法选择2018年1月至2020年1月在河南科技大学第二附属医院健康中心体检的年龄>45岁的绝经后女性为研究对象,分为骨质疏松组(n=370)和非骨质疏松组(n=321),检测血生化、血清鸢尾素、25(OH)D、I型前胶原氨基端肽(procollagen typeⅠN-terminal propeptide,P1NP)和1型胶原羧基端肽β特殊序列(beta C-terminal cross-linked telopeptides of type icollagen,β-CTX)骨代谢指标,测量BMD,计算四肢骨骼肌指数(ASMI),并统计分析。结果绝经后女性骨质疏松组的鸢尾素[(16.53±4.46)ng/mL VS(20.32±4.52)ng/mL,P <0.001]和25 (OH)D [(23.66±5.46)ng/mL VS(31.42±4.93)ng/mL,P <0.001]水平均低于非骨质...     

阳江市市区健康成人血清尿酸浓度调查分析

目的调查阳江市市区健康成人的血清尿酸浓度,以便开展多种疾病的预防工作。方法随机抽取1181名健康成人,做血清尿酸浓度测定。结果男性平均值为352.3±80·3μmol/L,女性平均值267·1±68·2μmol/L,男女相差明显(P<0·01),其差异有统计学意义。结论各实验室最好建立自己的血清尿酸参考范围。     

25-羟维生素D3与2型糖尿病血糖控制相关性研究

目的检测2型糖尿病患者血清25-羟维生素D3表达水平,探讨其在2型糖尿病病情评估与血糖控制中的价值。方法收集我院内分泌科诊断的2型糖尿病患者60例,以体检中心60例健康体检者作为对照,电化学发光法检测血清25-羟维生素D3,高效液相色谱法检测糖化血红蛋白,并对其与2型糖尿病患者糖化血红蛋白作相关性分析。结果 2型糖尿病患者血清25-羟维生素D3含量为17.02±0.51ng/ml低于健康体对照组的23.48±0.63ng/ml,差异有统计学意义(P0.05);血清25-羟维生素D3与2型糖尿病患者糖化血红蛋白负相关(r=-0.541,P=0.000),与全部研究对象糖化血红蛋白呈负相关(r=-0.663,P=0.000)。结论 2型糖尿病患者血清25-羟维生素D3含量低于健康体对照组,血清25(OH)D3水平与糖化血红蛋白呈负相关,即2型糖尿病患者的维生素D3水平与血糖控制有关,这对指导2型糖尿病的治疗可能有重要意义。     

孕中期体质量管理及干预治疗与25-（OH）D3的关系

目的探讨孕中期对孕妇进行体质量管理并及时补充维生素D,了解其与孕妇血清25-（OH）D3水平的关系。方法选取2012年10月至2013年12月在株洲市人民医院行产检的单胎孕妇300例,根据体质量指数（BMI）分为三组,每组100例。正常组体质量BMI〈25 kg/m^2;对照组不进行体质量管理的肥胖组,BMI〉30 kg/m^2;实验组进行体质量管理的肥胖组,BMI〉30 kg/m^2。三组孕妇均给予补充维生素D治疗2个月,在干预前后检测血清25-（OH）D3水平。结果孕妇补充维生素D 2个月后复查,三组血清25-（OH）D3水平均有提高,但实验组显著高于对照组,差异有统计学意义（P〈0.05）。结论孕妇肥胖维生素D缺乏尤为严重;此期合理进行体质量管理的同时补充维生素D有助于提高血25-（OH）D3水平,降低母婴并发症。     

Simultaneous determination of vitamins A, E and 25-OH-vitamin D: application in clinical assessments

OBJECTIVE: To optimize an HPLC method for the simultaneous determination of vitamins A, E and 25-OH-vitamin D. METHODS: Modifications include sample volume, internal standard, temperature, detection and injection volume. RESULTS AND DISCUSSION: Validity was supported by performance in interlaboratory exercises. Utility and versatility in clinical practice were assessed in outpatients and hospitalized subjects. The method was shown to be accurate and reliable for the simultaneous determination of vitamins A, E and 25-OH-vitamin D in serum throughout the entire range of clinically relevant concentrations.     

血清及卵泡液中25-羟维生素D与体外受精-胚胎移植妊娠结局的相关性

目的探讨血清及卵泡液中25-羟维生素D[25（OH）D]与体外受精-胚胎移植（IVF-ET）妊娠结局的关系。 方法选取2017年7月至2018年7月于山西医科大学第一医院生殖中心首次接受IVF-ET助孕治疗的67例不孕患者,按照妊娠结局分为妊娠组和未妊娠组。采用t检验或秩和检验比较2组间的实验室检查数据以及血清及卵泡液中25（OH）D的差异,差异具有统计学意义的变量进行Logistic多因素回归分析;采用Pearson相关分析法分析血清25（OH）D水平与卵泡液25（OH）D水平的相关性,采用Spearman相关分析法分析血清25（OH）D水平与三酰甘油、促甲状腺素、受精率的相关性。 结果所有患者平均血清25（OH）D水平为26.27 μg/L。（1）妊娠组与未妊娠组促甲状腺素［2.34（1.80~3.20）mIU/ml vs 2.93（2.28~4.53）mIU/ml］、三酰甘油［0.93（0.73~1.22）mmol/L vs 1.14（0.87~1.56）mmol/L］、Gn起始剂量［225.0（150.0~300.0）IU/L vs 262.5（225.0~300.0）IU/L］比较均低,差异均具有统计学意义（Z=-2.237、-2.138、-2.107,P=0.020、0.032、0.035）;妊娠组与未妊娠组的受精率［85.7%（78.3%~94.4%）vs 76.3%（63.5%~92.5%）］、血清及卵泡液中25（OH）D［血清：（37.08±13.39）mmol/L vs（28.90±12.53）mmol/L;卵泡液：（31.18±13.10）mmol/L vs （21.92±9.24）mmol/L］比较均高,差异均具有统计学意义（Z=-2.178,P=0.029;t=2.579、3.282,P=0.012、0.020）。（2）IVF-ET患者血清25（OH）D与卵泡液25（OH）D水平呈正相关（r=0.836,P<0.01）,与三酰甘油水平呈负相关（r=-0.286,P=0.019）,与促甲状腺素水平无相关性（r=-0.007,P=0.958）,与受精率呈正相关性（r=0.43,P<0.01）。（3）Logistic回归分析临床妊娠结局的影响因素结果显示血清25（OH）D、卵泡液25（OH）D、三酰甘油、促甲状腺素、Gn起始剂量、受精率在去除混杂因素后,对IVF-ET患者妊娠结局无明显影响（P均>0.05）,将血清与卵泡液25（OH）D联合之后再进行回归分析发现在去除混杂因素后,对IVF-ET患者妊娠结局也无明显影响（比值比=1.001,P=0.058）。 结论不孕症患者普遍存在维生素D缺乏,但维生素D和IVF-ET临床妊娠结局无明显相关性。     

Erythrocyte fatty acid composition does not influence levels of free,bioavailable, and total 25-hydroxy vitamin D

In vitro, mono- and polyunsaturated fatty acids (FAs) may decrease the binding affinity of vitamin D metabolites for vitamin D-binding protein, which in turn may influence their bioavailability. FAs incorporated as phospholipids in erythrocyte (ery-) cell membranes reflect dietary intake. The purpose of this study was to investigate ery-FA composition in relation to markers for vitamin D. In healthy females (age 22.6?±?2.0 years) total 25(OH)D was measured by LC-MS/MS (n?=?78), free 25(OH)D with ELISA (n?=?64 of 78), and bioavailable 25(OH)D was calculated. Analysis of ery-FA composition was by gas chromatography (n?=?56 of 78). A strong correlation between total 25(OH)D and free 25(OH)D was seen (r?=?.66, p?r?=?.68, p?r?=??.33, p?r?=??.47, p?r?=??.44, p?r?=??.35, p?=?.002) and weaker between bioavailable 25(OH)D (r?=??.35, p?=?.040) and free 25(OH)D (r?=??.28, p?=?.079). All fractions of 25(OH)D appear to correlate in a similar way to PTH, BMI and body fat (leptin). No association was found between ery-FA composition and free/bioavailable 25(OH)D. It is unlikely that FAs are a strong uncoupling factor of DBP-bound 25(OH)D.     

Measurement of 25-hydroxyvitamin D2, 25-hydroxyvitamin D3, 24,25-dihydroxyvitamin D2 and 25,26-dihydroxyvitamin D2 in a single plasma sample by mass fragmentography

A specific and sensitive assay for the measurement of the concentration of 25-hydroxyvitamin D2, 25-hydroxyvitamin D3, 24,25-dihydroxyvitamin D2 and 25,26-dihydroxyvitamin D2 in a single plasma sample is described, using stable isotope dilution mass fragmentography. After addition of appropriate deuterium-labelled internal standards, plasma samples were treated with acetonitrile to precipitate protein, and vitamin D metabolites were extracted on prepacked microparticulate reverse-phase cartridges. Further purification was achieved using straight-phase cartridges and high-performance liquid chromatography. Gas chromatography-mass spectrometry was carried out after appropriate derivatisation of samples and standards. The method has been evaluated in terms of specificity, recovery of added standards, and reproducibility.     

补充维生素D对慢性阻塞性肺疾病患者血清25（OH）D和FEVl的影响

目的观察慢性阻塞性肺疾病（COPD）患者补充维生素D后血清25一羟基维生素D[25（OH）D]和1秒用力呼气容积（FEVl）的变化,评价维生素D的辅助治疗价值。方法稳定期重度COPD患者72例,随机分成观察组和对照组,前组在吸入性激素治疗基础上辅助阿法骨化三醇干预,后组采用常规吸入性激素治疗。分别在治疗前和治疗3个月后,通过酶联免疫吸附法（ELISA）检测血清25（OH）D水平,Medisoft肺功能仪测定FEVl。结果阿法骨化三醇干预3个月后,观察组血清25（OH）D水平和FEVl较对照组有明显改善（P〈0．01）。结论补充维生素D可以改善COPD患者的肺功能,对呼吸器官有保护作用。     

Isotope dilution ultra performance liquid chromatography-tandem mass spectrometry method for simultaneous measurement of 25-hydroxyvitamin D2, 25-hydroxyvitamin D3 and 3-epi-25-hydroxyvitamin D3 in human serum

BackgroundAn ultra performance liquid chromatography-tandem mass spectrometry method with calibration traceable to NIST SRM was developed and validated to measure concentrations of 25-hydroxyvitamin D₂ (25OHD₂), 25-hydroxyvitamin D₃ (25OHD₃) and the C-3 epimer of 25OHD₃ (epi-25OHD₃) in human serum.MethodsTri- and hexa-deuterated internal standards were added to serum (100 μl) to monitor recovery. Liquid–liquid extraction was used to extract the hexane-soluble materials. Calibration solutions [8–100 nmol/L 25OHD_2, 12–150 nmol/L 25OHD₃, and 4–50 nmol/L epi-25OHD₃] prepared in phosphate-buffered saline containing 4% albumin were similarly processed. Using a pentafluorophenyl column (2.1 × 100 mm) and isocratic methanol/water (72/28, v/v) flowing at 0.4 ml/min, run time was 14 min per sample; 25OHD₃ and epi-25OHD₃ were baseline separated. Atmospheric pressure chemical ionization in the positive ion mode with selected reaction monitoring captured the following transitions: 25OHD₂, m/z 395.3 > 377.3 (209.1 qualifier); (epi-)25OHD₃, m/z 383.3 > 365.3 (105.1 qualifier); d₃-25OHD₂, m/z 398.3 > 380.3; and d₆-25OHD₃, m/z 389.3 > 371.3.ResultsRecovery averaged ≥ 98%. Total imprecision was ≤ 10% when concentrations were ≥ 20 nmol/l. Bias averaged < 5%. Detection limits were < 5 nmol/l. Median (nmol/l) 25OHD₂, 25OHD₃ and epi-25OHD₃ were quantitated in 98 blood donors (< LOD, 56.0, < LOD) and 35 pregnant women (< LOD, 87.6, 3.70).ConclusionsThis method is highly accurate, precise and specific.     

妊娠期糖尿病患者血清25(OH)D3、脂联素、内脂素、瘦素水平变化分析

脂素、瘦素水平和稳态模型胰岛素抵抗指数(HOMA-IR)水平,采用Spearman相关性分析法对血清25(OH)D3、脂联素、内脂素、瘦素水平和HOMA-IR作关联性分析,以及分析25(OH)D3、脂联素、内脂素、瘦素作单独诊断与联合诊断GDM的价值.结果研究组患者血清25(OH)D3、脂联素水平分别为(26.3±4....     

广州地区0～7岁儿童血清25羟维生素D水平检测结果分析

目的了解广州地区0~7岁儿童血清25羟维生素D[25(OH)D]营养状况。方法选取2018年2月至2019年6月期间体检的2418例0~7岁儿童为研究对象,采用液相色谱-串联质谱法(LC-MS/MS)检测血清25(OH)D₂和25(OH)D3浓度水平,分析性别、年龄、季节等对25(OH)D水平的影响。结果25(OH)D缺乏组113例(占4.7%),不足组534例(占22.1%),处于较低水平的占26.8%;不同性别儿童的25(OH)D水平存在差异,男童25(OH)D水平高于女童,缺乏和不足所占比例低于女童(P<0.05);25(OH)D水平随着年龄的增长呈下降趋势,3~4岁、4~5岁、5~6岁、6~7岁儿童血清25(OH)D缺乏和不足的比例高于0~1岁、1~2岁、2~3岁儿童(P<0.05);不同季节,0~7岁儿童25(OH)D水平夏季最高,冬季最低,冬季25(OH)D缺乏比例高于其他季节,夏季25(OH)D缺乏和不足比例最低(P<0.05);0~1岁儿童25(OH)D2检出率在7岁以下最高(P<0.05),25(OH)D2可有效降低缺乏和不足比例。结论0~7岁儿童25(OH)D水平与性别、年龄、季节有关,应加强对女童、3~6岁男女童及冬季期间补充维生素D,以满足机体需要。同时检测25(OH)D2和25(OH)D3有助于临床精准判断25(OH)D营养状况。     

支气管哮喘患儿血清25羟维生素D3水平变化及补充维生素D治疗对患儿发病、预后的影响研究

目的 探讨分析支气管哮喘患儿血清25羟维生素D3( 25 - OH - D3 )水平变化及补充维生素D治疗对患儿发病、预后的影响.方法 回顾性选择2016年1月至2019年1月承德医学院附属医院收治的200例支气管哮喘患儿为研究对象,设为A组,同时选择200例呼吸道感染的非支气管哮喘患儿、200名体检健康儿童分别设为B...     

Associations of serum amyloid A and 25‐hydroxyvitamin D with diabetic nephropathy: A cross‐sectional study

BackgroundThe present study investigated the relationships between serum amyloid A (SAA), 25‐hydroxyvitamin D (25(OH)VD) and diabetic nephropathy (DN) to provide evidence for the prevention and management of DN.MethodsA total of 182 patients with type 2 diabetes mellitus (T2DM) were enrolled in this study. The levels of SAA, 25(OH)VD, and other conventional indicators were measured and analyzed. Receiver operating characteristic curve analysis was applied for the combined measurement of SAA and 25(OH)VD, and risk factors for DN were evaluated using binary logistic regression analysis.ResultsThe levels of SAA in T2DM patients were significantly higher than those in healthy subjects, and the level significantly increased with the progression of DN (p < 0.05). In contrast, the level of 25(OH)VD in T2DM patients was significantly lower than that in healthy subjects, and the level significantly decreased with the progression of DN (p < 0.05). The combined measurement of SAA and 25(OH)VD distinguished DN patients from T2DM patients better than the measurement of SAA or 25(OH)VD alone. SAA was an independent risk factor for DN, and 25(OH)VD was an independent protective factor for DN.ConclusionSAA and 25(OH)VD might be used as potential markers to identify patients at increased risk of developing DN.     

血清维生素D及双歧杆菌水平与儿童重症龋齿的关系分析

目的分析维生素D及双歧杆菌水平与儿童重症龋齿的关系。 方法回顾性分析2020年2月至2021年2月于青岛海慈医院就诊的86例龋齿患儿临床资料,按照病情严重程度分为轻症组（n=54）与重症组（n=32）,另选择50健康儿童作为健康对照组。检测三组血清1,25二羟维生素D3［1,25（OH）₂D₃］、双歧杆菌水平、牙菌斑指数、血红蛋白（Hb）水平及平均红细胞体积（MCV）。采用Pearson相关分析考察1,25（OH）₂D₃、双歧杆菌水平与牙菌斑指数、Hb及MCV的相关性。绘制受试者工作特征（ROC）曲线,分析1,25（OH）₂D₃、双歧杆菌水平及其联合预测儿童重症龋齿发生的价值。 结果重症组1,25（OH）₂D₃水平＜轻症组＜健康组,重症组双歧杆菌水平及牙菌斑指数评分＞轻症组＞健康组,差异均有统计学意义（均P＜0.05）;重症组Hb水平及MCV＜轻症组＜健康组,差异均有统计学意义（均P＜0.05）;重症龋齿患儿的维生素D与牙菌斑指数呈负相关（r=-3.762,P＜0.05）,与Hb、MCV呈正相关（r=4.148、3.984,均P＜0.05）,双歧杆菌水平与Hb、MCV呈负相关（r=-4.685、-3.713,均P＜0.05）,与牙菌斑指数呈正相关（r=5.558,P＜0.05）。ROC曲线显示,1,25（OH）₂D₃、双歧杆菌水平及二者联合预测重症龋齿发生的曲线下面积（AUC）分别为0.802（95%CI：0.705~0.900）、0.724（95%CI：0.608~0.841）、0.819（95%CI：0.721~0.917）。 结论重症龋齿患儿的维生素D水平降低,双歧杆菌水平升高,二者水平与牙菌斑指数、Hb等密切相关,且联合可有效预测重症龋齿的发生。     

哮喘儿童血清1,25-二羟维生素D_3表达水平变化及其意义

目的探讨血清1,25-二羟维生素D3水平测定在儿童支气管哮喘治疗及预后的价值。方法采用酶联免疫吸附法(ELISA)分别测定142例不同严重程度哮喘患儿血清1,25-(OH)2D3值(分为轻、中、重3组),同时测定80例正常儿童血清1,25-(OH)2D3值。以上哮喘儿童经跟踪治疗1个月后,病情控制期时再测定以上指标,评价不同病程中受试儿童1,25-(OH)2D3水平变化的差异。结果重度组患儿血清1,25-(OH)2D3水平最低,正常儿童血清1,25-(OH)2D3水平最高,正常儿童及不同严重程度哮喘患儿血清1,25-(OH)2D3值差异均具有显著性(P0.05)。142例患儿进入病情控制期后,不同控制情况患儿血清1,25-(OH)2D3水平差异显著(P0.05),其中完全控制组血清1,25-(OH)2D3水平明显高于部分控制组及未控制组。结论哮喘儿童血清1,25-(OH)2D3处于低水平状态并与其病情严重程度及控制情况有关。因此,儿童哮喘血清1,25-二羟维生素D3表达水平的监测对预测病情程度、评价预后均有一定意义。     

血清25-羟维生素D3水平与婴儿特应性皮炎严重度的相关性研究

目的探讨血清25-羟维生素D3(25-(OH)D3)水平与婴儿特应性皮炎严重度的相关性,以进一步探究25-(OH)D3与特应性皮炎的关系。方法选取160例特应性皮炎患儿,收集患儿的相关资料并检测其血清25-(OH)D3、嗜酸性粒细胞比例的水平。对比轻中度特应性皮炎患儿和重度特应性皮炎患儿的血清25-(OH)D3、嗜酸性粒细胞比例水平。分析特应性皮炎患儿25-(OH)D3缺乏的危险因素以及血清25-(OH)D3与SCORAD评分、嗜酸性粒细胞比例的相关性。结果重度特应性皮炎患儿平均月龄为10.01±6.64个月,25-(OH)D3为46.46±18.91nmol/L,显著低于轻中度特应性皮炎患儿,而嗜酸性粒细胞比例为0.125±0.039,显著高于轻中度特应性皮炎患儿(P<0.05)。喂养方式为特应性皮炎患儿25-(OH)D3缺乏的危险因素,其中,母乳喂养患儿发生25-(OH)D3缺乏的风险显著高于人工喂养患儿(P<0.05);补充25-(OH)D3是特应性皮炎患儿25-(OH)D3缺乏的保护性因素(P<0.05)。特应性皮炎患儿血清25-(OH)D3与SCORAD评分、嗜酸性粒细胞比例均呈负相关关系(r=-0.371、-0.342,P<0.05)。结论血清25-(OH)D3水平降低与婴儿特应性皮炎的严重程度相关,临床应重视患儿血清25-(OH)D3水平的检测并积极防治25-(OH)D3缺乏以提高婴儿特应性皮炎的防治效果。