Araştırma Çıktıları

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Author: search.filters.author.Serdar, Muhittin

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    A short guideline on chronic kidney disease for medical laboratory practice
    (WALTER DE GRUYTER GMBH, 2016-01-01) Abusoglu, Sedat; Aydin, Ilknur; Bakar, Funda; Bekdemir, Tan; Gulbahar, Ozlem; Islekel, Huray; Ozarda, Yesim; Pektas, Macit; Pir, Kamil; Portakal, Oytun; Serdar, Muhittin; Turhan, Turan; Yucel, Dogan; Zengi, Oguzhan
    Chronic kidney disease (CKD) is asymptomatic in the early stage. Kidney function might be lost 90\% when the symptoms are overt. However, in case of early detection, progression of the disease can be prevented or delayed. If not detected it results in end stage renal disease. Therefore, the level of awareness about CKD should be increased. The role of medical laboratory is utmost important for the diagnosis and staging of CKD. In this paper, the main tasks of the laboratory specialists are described and the outlines are as follows. Creatinine assays should be traceable to internationally recognised reference materials and methods, specifically isotope dilution mass spectrometry. When reporting the creatinine result, eGFR should also be reported in adult (> 18 years) population. A warning expression should be included in the report form if eGFR result is <60 mL/min/1.73 m(2). eGFR values should be expressed quantitatively up to 90 mL/min/1.73 m(2) by CKD-EPI equation. Above 90 mL/min/1.73 m(2), eGFR values can be expressed quantitatively or >90 mL/min/1.73 m2. eGFR equations of the adult population should not be used for pediatric population. Different equations utilizing also patient height should be used. The enzymatic creatinine assay should be preferred. eGFR based on cystatin C can be used for confirmation in the pediatric population. Cystatin C measurements, at least when eGFR based on creatinine is not reliable and for confirmation should be encouraged. Proteinuria or albuminuria values should be measured in spot samples and reported in proportion to creatinine.
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    Exposure to Perchlorate in Lactating Women and Its Associations With Newborn Thyroid Stimulating Hormone
    (FRONTIERS MEDIA SA, 2018-01-01) Ucal, Yasemin; Sahin, Ozlem N.; Serdar, Muhittin; Blount, Ben; Kumru, Pinar; Muhcu, Murat; Eroglu, Mustafa; Akin-Levi, Cansu; Keles, Z. Zeynep Yildirim; Turam, Cem; Valentin-Blasini, Liza; Morel-Espinosa, Maria; Serteser, Mustafa; Unsal, Ibrahim; Ozpinar, Aysel
    Background: Perchlorate, thiocyanate, and nitrate can block iodide transport at the sodium iodide symporter (NIS) and this can subsequently lead to decreased thyroid hormone production and hypothyroidism. NIS inhibitor exposure has been shown to reduce iodide uptake and thyroid hormone levels
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    COVID-19 laboratory biosafety guide
    (WALTER DE GRUYTER GMBH, 2020-01-01) Zengi, Oguzhan; Aykal, Guzin; Coskun, Cihan; Serdar, Muhittin; Yucel, Dogan
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    Determining biological variation of serum parathyroid hormone in healthy adults
    (CROATIAN SOC MEDICAL BIOCHEMISTRY \& LABORATORY MEDICINE, 2019-01-01) Ercan, Mujgan; Akbulut, Emis Deniz; Avci, Esin; Yucel, Cigdem; Oguz, Esra Firat; Turhan, Turan; Serdar, Muhittin
    Introduction: Measurement of parathyroid hormone (PTH) is essential in the investigation and management of calcium metabolism disorders. To assess the significance of any assay result when clinical decision making biological variation (BV) of the measurand must be taken into consideration. The aim of the present study is determining the BV parameters for serum PTH. Materials and methods: Blood samples were taken at weekly intervals from 20 healthy subjects for ten weeks in this prospective BV study. Serum ``intact PTH{''} concentrations were measured with electrochemiluminescence method. Biological variation parameters were estimated using the approach proposed by Fraser. Results: The values of within-subject biological variation (CVI), between-subject biological variation (CVG), analytical variation (CVA), reference change value (RCV) and individuality index (II) for serum PTH were 21.1\%, 24.9\%, 3.8\%, 59.4\% and 0.8\%, respectively. Within-subject biological variation and CVG were also determined according to gender separately
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    Comparison of warm fluid and cold fluid resuscitation during uncontrolled hemorrhagic shock model in rats
    (TURKISH ASSOC TRAUMA EMERGENCY SURGERY, 2017-01-01) Dilmen, Serkan; Eryilmaz, Mehmet; Balkan, Salih Mujdat; Serdar, Muhittin; Durusu, Murat; Yildirim, Ali Osman; Dilmen, Sanem Aslihan
    BACKGROUND: This study was designed to compare the effects of resuscitation with cold and warm fluid on survival time, rate and volume of hemorrhage, hemodynamics, hypothermia, coagulopathy, acid-base balance, hematocrit, lactate, and base deficit during uncontrolled hemorrhagic shock (HS) model in rats. METHODS: HS model was created with splenic vascular and parenchymal injury in 29 rats under ketamine and xylazine anesthesia. Thirty minutes after the hemorrhage, the rats were randomized to receive 14.5 mL/kg 0.9\% sodium chloride solution at either 24 degrees C (Group I
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    INCREASED MATERNAL LEPTIN LEVELS MAY BE AN INDICATOR OF SUBCLINICAL HYPOTHYROIDISM IN A NEWBORN
    (SOC MEDICAL BIOCHEMISTS SERBIA, 2022-01-01) Karpuzoglu, Hande; Ucal, Yasemin; Kumru, Pinar; Muhcu, Murat; Eroglu, Mustafa; Serdar, Muhittin; Serteser, Mustafa; Ozpinar, Aysel
    Background: Several factors may influence newborn thyroid-stimulating hormone (TSH) concentrations and cause subclinical hypothyroidism in a newborn. A sufficient level of leptin signalling is needed for the normal production of TSH and thyroid hormones by the thyroid gland. Our study aimed to investigate the correlation between maternal serum leptin concentration during the third trimester of pregnancy and newborn screening-TSH levels. Methods: This prospective cross-sectional study was conducted in obstetrics and gynaecology clinics of a state hospital between June and August 2013. Maternal venous blood samples were collected from 270 healthy pregnant women in the third trimester just before delivery. Measurements of maternal fT3, fT4, TSH, anti-thyroid peroxidase (TPO), and anti-thyroglobulin (anti-Tg) antibodies from serum samples were performed by chemiluminescence immunoassay. Maternal serum leptin levels were determined by ELISA. Dried capillary blood spots were used to measure newborn TSH levels. Results: Subjects were divided into two groups according to the neonatal TSH levels using a cut-point of 5.5 mIU/L. Median maternal serum leptin levels were significantly higher in newborns whose TSH levels were higher than >5.5 mIU/L {[}13.2 mg/L (1.3-46.5) vs 19.7 mg/L (2.4-48.5), p<0.05]. Serum leptin levels showed a negative correlation with maternal fT4 (r=0.32, p<0.05), fT3 (r=0.23, p<0.05), and a positive correlation with BMI (r=0.30, p<0.05). Conclusions: Our results suggest that high leptin levels in the third trimester of pregnancy influence maternal thyroid functions and might cause an increase in newborn TSH levels. Detection of high maternal serum leptin levels may be a reason for subclinical hypothyroidism.
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    Evaluation of four different HPLC devices for hemoglobinopathy screening
    (WALTER DE GRUYTER GMBH, 2021-01-01) Karadag, Mujgan Ercan; Akbulut, Emis Deniz; Avci, Esin; Oguz, Esra Firat; Kader, Saadet; Abusoglu, Gulsum; Serdar, Muhittin; Yamaz, Fatma Meric
    Objective: Hemoglobinopathies are a common public health problem in Turkey. In the screening of these disorders in population, cation-exchange high performance liquid chromatography (HPLC) is accepted as the gold standard method. In this study, the aim was to assess four different HPLC devices used in hemoglobinopathy screening. Materials and methods: A total of 58 blood samples were analyzed with four different HPLC methods (Bio-Rad variant II, Agilent 1100, Tosoh G8 and Trinity Ultra2 trademarks). Results: The comparison study demonstrated a good correlation between the results of each HPLC analyzer and the reference value obtained by averaging all the HbA(2) results belonging to the methods tested in the study {[}(Tosoh G8 (r=0.988), Bio-Rad variant II (r=0.993), Agilent 1100 (r=0.98) and Trinity Ultra2 (r=0.992)]. HbA(2) determination in the presence of HbE was interfered in both BioRad variant II and Tosoh G8. Conclusion: The analyzers were found to have compatible HbA(2) results but with accompanying different degrees of proportional and systematic biases. HPLC analyzers may be affected by different hemoglobin variants at different HbA(2) concentrations, which is an important point to take into consideration during the evaluation of HbA(2) results in thalassemia screening.
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    Biological variation and reference change value data for serum copper, zinc and selenium in Turkish adult population
    (WALTER DE GRUYTER GMBH, 2021-01-01) Bal, Ceylan; Erdogan, Serpil; Gok, Gamze; Nural, Cemil; Ozbek, Betul; Ercan, Mujgan; Serdar, Muhittin; Erel, Ozcan
    Objectives: Calculation of biological variation (BV) components is very important in evaluating whether a test result is clinically significant. The aim of this study is to analyze BV components for copper, zinc and selenium in a cohort of healthy Turkish participants. Methods: A total of 10 serum samples were collected from each of the 15 healthy individuals (nine female, six male), once a week, during 10 weeks. Copper, zinc and selenium levels were analyzed by atomic absorption spectrometer. BV parameters were calculated with the approach suggested by Fraser. Results: Analytical variation (CVA), within-subject BV (CVI), between-subject BV (CVG) values were 8.4, 7.1 and 4.3 for copper
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    Evaluation of aortic intima-media thickness in newborns with Down syndrome
    (WROCLAW MEDICAL UNIV, 2017-01-01) Sarici, Dilek; Kurtoglu, Selim; Sarici, Serdar Umit; Yikilmaz, Ali; Akin, Mustafa Ali; Gunes, Tamer; Ozturk, Mehmet Adnan; Narin, Nazmi; Dundar, Munis; Serdar, Muhittin
    Background. Health care programs for children with Down syndrome (DS) help improve the overall outcome and quality of life of these children. It is therefore very important to focus on the most common and serious problems of these patients, such as congenital heart defects and cardiac problems, and to keep medical guidelines updated with regard to these problems. Objectives. The aim of this study was to evaluate aortic intima-media thickness (aIMT), lipid profiles and blood pressure in DS patients in comparison with a control group of age-and gender-matched neonates without DS. Material and methods. Serum concentrations of lipids (total cholesterol, LDL-cholesterol, HDL-cholesterol, and triglyceride), blood pressure and abdominal aIMT were measured in newborns with DS, and compared with the measurements from age-and gender-matched newborns without DS. Results. No statistically significant differences between the 2 groups of newborns were detected with respect to aIMT, lipid levels or blood pressure. Conclusions. This study represents the first investigation of aIMT - one of the most important indicators of atherosclerosis - in DS patients, but neither a significantly increased aIMT, nor any significant changes in lipid profiles or blood pressure were detected in this group of patients. Whether aIMT differs according to the type of congenital heart defect (such as atrial septal defect, ventricular septal defect, patent ductus arteriosus, and atrioventricular septal defect) among DS patients remains to be determined in future studies.
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    Association of maternal serum trace elements with newborn screening-thyroid stimulating hormone
    (WALTER DE GRUYTER GMBH, 2020-01-01) Ucal, Yasemin; Serdar, Muhittin; Akin-Levi, Cansu; Yildirim-Keles, Zeynep Zulfiye; Turam, Cem; Kumru, Pinar; Muhcu, Murat; Eroglu, Mustafa; Aksungar, Fehime; Ozpinar, Aysel
    Objectives: Trace elements are essential in thyroid functioning as they incorporate into biologically important enzymes as cofactors. The placenta can either activate or inhibit the transfer of maternal trace elements to the unborn. An imbalance of maternal trace elements in pregnancy may affect both maternal and newborn thyroid function. Methods: Blood samples from 315 lactating mothers were collected in the first 48 h after delivery and evaluated for selenium (Se), copper (Cu), manganese (Mn), and zinc (Zn) using flame atomic absorption spectroscopy (FAAS) and quadrupole inductively coupled plasma-mass spectrometer (ICP-MS). Thyroid hormones and auto-antibodies (thyroid-stimulating hormone (TSH), free T3 (fT3), free T3 (fT4), anti-thyroid peroxidase (anti-TPO), and antithyroglobulin (anti-TG)) were analyzed in maternal blood using an electro-chemiluminescence immunoassay (ECLIA). Between 48 and 72 postpartum hours, spot blood samples were used for newborn screening-TSH measurement. Correlation and multivariate analyses were performed to evaluate the effect of maternal trace element levels on newborn screening-TSH levels. Results: The medians (min-max) of maternal Se (45.16 mu g/L (21.28-79.04)), Cu (210.10 mu g/dL (117.04-390.64)), Mn (2.11 mu g/L (0.20-3.46)), and Zn (0.43 mg/L (0.24-0.66)) were determined. A positive correlation was detected between Zn and maternal TSH levels (r=0.12, p < 0.05). Newborn screening-TSH was significantly correlated with maternal Cu (r=0.14, p < 0.01). Similarly, Cu exhibited weak associations in clustering analysis while others shared common clusters with newborn-screening TSH. Conclusions: There was no significant association between most of the maternal serum trace elements and maternal thyroid hormone parameters, with an only exception between maternal Zn and maternal serum TSH. Finally, the association between maternal serum Cu levels and newborn screening-TSH levels may highlight the importance of maternal Cu levels on the newborn thyroid health.