Use of total patient data for indirect estimation of reference intervals for 40 clinical chemical analytes in Turkey

Author(s):  
Yesim Ozarda Ilcol ◽  
Diler Aslan

AbstractIn the present study we used patient data to calculate laboratory-specific indirect reference intervals. These values were compared with reference intervals obtained for a healthy group according to recommendations of the International Federation of Clinical Chemistry and Laboratory Medicine and manufacturer suggestions. Laboratory results (422,919 records) from all subjects of 18–45years of age over a 1-year period were retrieved from our laboratory information system and indirect reference intervals for 40 common analytes were estimated using a modified Bhattacharya procedure. Indirect reference intervals for most of the biochemical analytes were comparable, with small differences in lower [alkaline phosphatase (ALP) (male), alanine aminotransferase (ALT), creatine kinase, iron (male), total iron-binding capacity, folic acid, calcium (female), lactate dehydrogenase (LDH), lipoprotein (a) [Lp(a)], thyroid-stimulating hormone (TSH), total triiodothyronine (TClin Chem Lab Med 2006;44:867–76.

2013 ◽  
Vol 59 (9) ◽  
pp. 1393-1405 ◽  
Author(s):  
Dana Bailey ◽  
David Colantonio ◽  
Lianna Kyriakopoulou ◽  
Ashley H Cohen ◽  
Man Khun Chan ◽  
...  

BACKGROUND Reference intervals are indispensable in evaluating laboratory test results; however, appropriately partitioned pediatric reference values are not readily available. The Canadian Laboratory Initiative for Pediatric Reference Intervals (CALIPER) program is aimed at establishing the influence of age, sex, ethnicity, and body mass index on biochemical markers and developing a comprehensive database of pediatric reference intervals using an a posteriori approach. METHODS A total of 1482 samples were collected from ethnically diverse healthy children ages 2 days to 18 years and analyzed on the Abbott ARCHITECT i2000. Following the CLSI C28-A3 guidelines, age- and sex-specific partitioning was determined for each analyte. Nonparametric and robust methods were used to establish the 2.5th and 97.5th percentiles for the reference intervals as well as the 90% CIs. RESULTS New pediatric reference intervals were generated for 14 biomarkers, including α-fetoprotein, cobalamin (vitamin B12), folate, homocysteine, ferritin, cortisol, troponin I, 25(OH)-vitamin D [25(OH)D], intact parathyroid hormone (iPTH), thyroid-stimulating hormone, total thyroxine (TT4), total triiodothyronine (TT3), free thyroxine (FT4), and free triiodothyronine. The influence of ethnicity on reference values was also examined, and statistically significant differences were found between ethnic groups for FT4, TT3, TT4, cobalamin, ferritin, iPTH, and 25(OH)D. CONCLUSIONS This study establishes comprehensive pediatric reference intervals for several common endocrine and immunochemical biomarkers obtained in a large cohort of healthy children. The new database will be of global benefit, ensuring appropriate interpretation of pediatric disease biomarkers, but will need further validation for specific immunoassay platforms and in local populations as recommended by the CLSI.


2021 ◽  
Vol 2 (2) ◽  
Author(s):  
Tulus Amudi ◽  
Stella Palar

Abstract: Generally, chronic kidney disease (CKD) is associated with anemia due to decrease of erythropoietin that plays an important role in erythropoiesis. We reported a patient, 61-year-old male, suffered from chronic hemodialysis kidney disease with coinfection of viral hepatitis C, albeit, had normal hemoglobin and erythropoietin levels. The patient was diagnosed as CKD in March 2014 with laboratory results, as follows: hemoglobin (Hb) 9.9 g/dl; ureum 223 mg/dl; creatinine 7.5 mg/dl, and was confirmed with ultrasonography. The patient underwent hemodialysis and was treated with erythropoiesis stimulating agent (ESA) for the first time in April 2014. The last ESA was given in June 2015 and the laboratory results were serum iron 61 µg/dl, total iron binding capacity (TIBC) 173 µg/dl, ferritin 1431 ng/ml, and the qualitative anti HCV test was reactive. Afterwards, the patient was not treated with ESA anymore since his Hb level was normal without ESA or blood transfusion. Moreover, the erythropoietin (EPO) level was tested in December 2018 resulted within normal level. Until now, the patient is still undergoing hemodialysis without ESA or transfusion. This is a rare condition, and there is still no certain pathophysiology to explain. It is assumed that the mechanism is related to hepatitis C infection that stimulates the hepatocyte regeneration, therefore, the cells produce endogen erythropoietin resulting in increased Hb level.Keywords: chronic kidney disease (CKD), erythropoietin and hemoglobin level Abstrak: Umumnya penyakit ginjal kronik (PGK) disertai dengan anemia akibat penurunan eritropoietin yang berperan penting dalam proses eritropoiesis. Kami melaporkan kasus seorang laki-laki 61 tahun dengan PGK hemodialisis disertai ko-infeksi hepatitis C namun dengan kadar hemoglobin dan eritropoietin normal. Pasien dinyatakan PGK sejak Maret 2014 dengan kadar hemoglobin (Hb) 9,9 g/dL; ureum 223 mg/dl; kreatinin 7,5 mg/dl, dan didukung oleh hasil ultrasonografi. Pasien diberikan hemodialisis dan terapi ESA pertama kali pada bulan April 2014. Terapi ESA terakhir diberikan pada bulan Juni 2015 dengan hasil serum iron 61 µg/dl, total iron binding capacity (TIBC) 173 µg/dl, feritin 1431 ng/ml, dan anti HCV kualitatif reaktif, Setelah itu pasien tidak mendapat terapi ESA lagi karena pada pemeriksaan laboratorium ditemukan kadar hemoglobin normal tanpa terapi ESA atau transfusi darah. Pemeriksaan kadar eritropoietin (EPO) pada bulan Desember 2018 mendapatkan hasil 16 mIU/ml (nilai normal 2,6-18,5 mIU/ml). Hingga saat ini pasien masih rutin menjalani hemodialisis dan tidak pernah mendapat terapi ESA atau transfusi darah. Keadaan tersebut jarang ditemukan, dan tidak ada patofisologi yang pasti untuk menjelaskan penyebab keadaan tersebut. Mekanisme keadaan ini dikaitkan dengan infeksi hepatitis C yang merangsang regenerasi hepatosit, sehingga sel-sel tersebut menghasilkan hormon ertiropoietin endogen, dengan hasil akhir ialah peningkatan hemoglobin.Kata kunci: penyakit ginjal kronik (PGK), kadar eritropoietin dan hemoglobin


Author(s):  
Salauddin Al Azad ◽  
Sharmin Ahmed ◽  
Partha Biswas ◽  
Md. Abdur Rashid Mia ◽  
Mithila Farjana ◽  
...  

Anemia and thyroid disorders are global health issues that affect all ages but are more apparent in women. In this case, some serological components responsible for IDA and TSH disorders in women have been found actively regulated through a complex steroidal-calcitriol mediated pathway. This research has been investigated the correlation between Calcitriol and the serological components responsible for IDA and TSH disorders in childbearing and non-child-bearing women of different health conditions. Experimental sampling from 452 women suffering from both IDA and TSH disorders were taken, aged between 0 and 70 years. Serological parameters, such as iron, total iron-binding capacity and ferritin, were assessed for IDA profiling, whereas thyroid-stimulating hormone and free thyroxin were for TSH profiling based on the individual’s serum calcitriol status. The resulted serological data were interpreted using sophisticated computer programming language and algorithms for quantitative biochemical analysis. The study resulted in a significant correlation between FT4 and Calcitriol (P<0.0001) for all age groups. TSH also showed strong interactions with the fluctuation of calcitriol level (P<0.0001), except for the children aged below 10 years (P<0.063). The iron, TIBC, TSH, and FT4 showed phenomenal regulation with the steroidal-calcitriol concentration for congenital patients. Unlike the others, ferritin has a substantial connection with Calcitriol (P<0.0064) fluctuation in the serum. To ratify, the concentrations of TSH, FT4, iron, TIBC, and ferritin were found to be significantly interconnected in terms of serum calcitriol level in women suffering from IDA and TSH disorders simultaneously. To understand the accuracy and efficacy of the Calcitriol in IDA and TSH disorders, some other inflammatory markers and parathyroid hormone analysis are need in future studies, besides a large number of samples.


1989 ◽  
Vol 11 (1) ◽  
pp. 40-41 ◽  
Author(s):  
Luc Cynober ◽  
Jacques Le Boucher ◽  
Jacqueline Giboudeau

The Kone Progress, a multiparametric discrete analyser, was used to determine serum transferrin with a kit supplied by Kone. Assays recommended by the French Society of Clinical Chemistry were performed in order to assess the suitability of the test. Repeatability was assessed using serum pools with low (L), medium (M) and high (H) concentrations of transferrin. The coeffcients of variation (CV) were 5.4, 3.2 and 2.0% respectively for 30 determinations (within-batch). Reproducibility on 15 consecutive days (between-batch) was also satisfactory (CV for L = 7.3%, M = 6.3% and H = 3.8%). There was no serum-to-serum contamination. Results correlated closely with those obtained using radial immunodiffusion (RID) (r = 0.942) and total iron-binding capacity (r = 0.954)for 90 determinations.Transferrin measurement by immunoturbidimetry on the Kone Progress emerges as a well-suited, rapid and inexpensive alternative to other time-consuming (RID) and sophisticated (laser immunonephelemeter) techniques.


1992 ◽  
Vol 38 (10) ◽  
pp. 2078-2081 ◽  
Author(s):  
J Beilby ◽  
J Olynyk ◽  
S Ching ◽  
A Prins ◽  
N Swanson ◽  
...  

Abstract We surveyed 140 clinical chemistry laboratories in Australia to establish which laboratory methods they used to determine serum iron status: 125 measured serum iron (Fe), 85 measured transferrin (TRF), 47 measured total iron-binding capacity (TIBC), and 14 measured both TRF and TIBC. Of the 55 laboratories routinely reporting TRF saturation (TS), 16 calculated TS directly as (Fe/TIBC) x 100, and 9 used [Fe/(TRF x 2)] x 100. Thirty laboratories measured TRF and converted it to an equivalent TIBC concentration; the derived TIBC was then used to calculate TS. We measured iron, TIBC, and TRF concentrations in 94 control subjects, 59 patients with alcoholic liver disease (ALD), and 20 with proven genetic hemochromatosis (GH). TS was compared with a transferrin index (TI = Fe/TRF) to determine whether both methods were sensitive for GH screening and which method gave the fewest false-positive results with discrimination limits of > 55% and > 1.0, respectively. All GH patients were detected by both TS and TI at these limits. One control subject had a TI > 1.0, whereas three control subjects had a TS > 55%. Nine patients with ALD had a TI > 1.0 and 11 ALD patients had a TS > 55%. Some iron-overload patients had lower than expected TS values compared with TI, possibly because of ferritin interference in the TIBC assay. Also, the precision of the TRF assay was better than that of the TIBC assay: CVs of 1.85-3.68% vs 6.17%. We therefore recommend that calculated TI replace TS in screening for iron overload.


2017 ◽  
Vol 8 (3) ◽  
pp. 41-48 ◽  
Author(s):  
Kushal Bhattarai ◽  
Nilu Manandhar ◽  
Prabodh Shrestha ◽  
Sangita Thapa ◽  
Jharana Shrestha ◽  
...  

Background: Reference intervals of any biochemical analyte serve as an invaluable tool in clinical decision making. The IFCC (International Federation of Clinical Chemistry) guidelines for determining these values are not feasible in some hospital laboratory setting and have led to the development of alternative approaches.Aims and Objectives: To determine the indirect reference intervals for serum thyrotropin form the hospital records of individuals visiting a tertiary care center.Materials and Methods: In a hospital-record based, observational, cross-sectional study, data of serum TSH levels were collected from the hospital records of participants who underwent this test in the Central Clinical Laboratory, College of Medical Sciences and Teaching Hospital, Bharatpur, Chitwan, Nepal from July 2012 to June 2015. All the individuals, irrespective of their diagnoses of thyroid diseases and other possible comorbid conditions, were included in the study. Prior to the statistical analyses, partitioning was done in relation to gender, age, and ethnicity. The reference intervals for thyrotropin were established by non-parametric method.Results: Reference intervals for serum TSH best agreeing to those provided by the test kit suppliers were determined by combining the two strategies that used Tukey’s method of detection and removal of outliers, prior to the final analyses. Lower limit was best determined from the natural-log-transformed and upper limit from non-transformed TSH values with outliers removed by Tukey’s method in both. As such, for the cases with TSH in the range 0.02-98.8 mIU/L, the reference intervals were calculated as [0.31 (0.30-0.33) to 6.04 (5.97-6.12) mIU/L] and for the TSH in the range 0.102-9.99 mIU/L, [0.35 (0.34-0.37) to 5.81 (5.75-5.90) mIU/L].Conclusion: For establishing the indirect reference intervals from the hospital records, laboratory data can be combined with information stored in clinical databases for selecting subjects fulfilling stated clinical criteria.Asian Journal of Medical Sciences Vol.8(3) 2017 41-48


2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Neda Soleimani ◽  
Sahand Mohammadzadeh ◽  
Fateme Asadian

Introduction. As a common interferer in clinical chemistry, lipemic specimens could be a source of significant analytical errors. Ultracentrifugation has been by far the only reliable, but an unavailable and expensive, method to eliminate the lipemic effect. Materials and Methods. Among the daily samples, those with triglyceride >400 mg/dL (4.6 mmol/L) and also turbid were selected, divided into three groups, based on triglyceride concentration, and three pooled serums were made for each group. Then all pooled serums were investigated by using a DIRUI biochemistry analyzer CS-800 for routine chemistry tests in different methods including direct measurement, serum blank, serum dilution, and measurement after ultracentrifugation. Results. According to our study, there were significant differences before and after ultracentrifugation in all lipemic levels and for all parameters except for alanine aminotransferase (ALT), alkaline phosphatase (ALP), bilirubin, and uric acid. Based on allowable inaccuracy for each parameter, calcium, magnesium, phosphorus, total protein, iron, total iron-binding capacity (TIBC), urea, and chloride are being influenced by all lipemic degree and neither serum dilution nor using serum blank is as effective as ultracentrifuge for elimination. Serum blank was a proper method of lipid removal for the measurement of glucose. Conclusion. Lipemia is a well-known interferer in clinical chemistry. One cannot avoid lipemia, but fortunately, severe lipemia is a rare phenomenon in the laboratory, and for assessment of some analytes in a lower degree of lipemia, use of serum blank eliminates the need for ultracentrifuge.


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