A further comparison of radioassay results for serum and plasma.

1979 ◽  
Vol 25 (1) ◽  
pp. 135-136 ◽  
Author(s):  
N P Kubasik ◽  
H E Sine
Keyword(s):  
Serum Samples ◽  
Blood Samples ◽  
Clinical Interpretation ◽  
Sufficient Magnitude

Abstract We evaluated results for serum vs. plasma for 12 selected radioassay procedures. Blood samples were collected with heparin, oxalate-fluoride, or ethylenediaminetetraacetate as anticoagulant and compared with the corresponding serum samples. In combination with a previous report [Kubasik, N.P., and Sine, H.E., Clin. Chem. 24 137 (1978)] we have now tested a total of 25 different analytes, using 31 manufacturers' kits. Differences were again demonstrated between serum and plasma that may be of sufficient magnitude to alter clinical interpretation of the results. Assays also demonstrated differences based on the procedure used.

Results for serum and plasma compared in 15 selected radioassays.

1978 ◽  
Vol 24 (1) ◽  
pp. 137-139 ◽  
Author(s):  
N P Kubasik ◽  
H E Sine
Keyword(s):  
Plasma Samples ◽  
Serum Samples ◽  
Blood Samples ◽  
Clinical Interpretation ◽  
Sufficient Magnitude

Abstract We evaluated the results for serum vs. plasma samples for 15 selected radioassay procedures, using 19 manufacturers' kits. Blood samples were collected with heparin, oxalate-fluoride, or ethylenediaminetetraacetate anticoagulants and compared with serum samples. Differences were demonstrated between serum and plasma which may be of sufficient magnitude to alter clinical interpretation of the results. Assays also demonstrated significant differences based on the kit manufacturer and procedure used.

Evaluation of management strategy results of laboratory studies in serum samples with hemolysis

2019 ◽  
Vol 1 (4) ◽  
pp. 43-45
Author(s):  
O. A. Klimenkova ◽  
V. P. Pashkova ◽  
T. V. Vavilova ◽  
V. S. Berestovskaya
Keyword(s):  
Management Strategy ◽  
Negative Consequences ◽  
Laboratory Studies ◽  
Serum Samples ◽  
Ongoing Debate ◽  
Clinical Interpretation ◽  
Points Of View ◽  
Test Result ◽  
High Uncertainty

There is an ongoing debate about what the laboratory should do with hemolyzed samples. Several strategies are proposed for managing the results obtained in such samples. The safest option from the analytical and clinical points of view is to perform a study of a new sample without hemolysis. Another approach is to carry out a test irregardless, but at the same time indicate a limit on the clinical interpretation of the result, by making a comment on possible hemoglobin interference. The choice of strategy should be based on a comparison of the risk of negative consequences in the absence of a test result and the likelihood of harm due to the transfer of the result with high uncertainty to the clinician.

scholarly journals PRRSV detection by qPCR in processing fluids and serum samples collected in a positive stable breeding herd following mass vaccination of sows with a modified live vaccine

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
A. Lebret ◽  
P. Berton ◽  
V. Normand ◽  
I. Messager ◽  
N. Robert ◽  
...  
Keyword(s):  
The United States ◽  
Live Vaccine ◽  
Mass Vaccination ◽  
Respiratory Syndrome Virus ◽  
Serum Samples ◽  
Blood Samples ◽  
Stability Monitoring ◽  
Breeding Herd ◽  
Modified Live Vaccine ◽  
Processing Fluid

AbstractIn the last two decades, in France, Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) stabilization protocols have been implemented using mass vaccination with a modified live vaccine (MLV), herd closure and biosecurity measures. Efficient surveillance for PRRSV is essential for generating evidence of absence of viral replication and transmission in pigs. The use of processing fluid (PF) was first described in 2018 in the United States and was demonstrated to provide a higher herd-level sensitivity compared with blood samples (BS) for PRRSV monitoring. In the meantime, data on vertical transmission of MLV viruses are rare even as it is a major concern. Therefore, veterinarians usually wait for several weeks after a sow mass vaccination before starting a stability monitoring. This clinical study was conducted in a PRRSV-stable commercial 1000-sow breed-to-wean farm. This farm suffered from a PRRS outbreak in January 2018. After implementing a stabilisation protocol, this farm was controlled as stable for more than 9 months before the beginning of the study. PF and BS at weaning were collected in four consecutive batches born after a booster sow mass MLV vaccination. We failed to detect PRRSV by qPCR on PF and BS collected in a positive-stable breeding herd after vaccination with ReproCyc® PRRS EU (Boehringer Ingelheim, Ingelheim, Germany).

Search for Melanoma Markers in Plasma and Serum Samples

2005 ◽  
Vol 11 (3) ◽  
pp. 353-360 ◽  
Author(s):  
Roberta Seraglia ◽  
Susanna Vogliardi ◽  
Graziella Allegri ◽  
Stefano Comai ◽  
Mario Lise ◽  
...  
Keyword(s):  
High Frequency ◽  
Healthy Subjects ◽  
Ionic Species ◽  
Low Molecular Weight ◽  
Ionization Mass ◽  
Plasma Samples ◽  
Serum Samples ◽  
Blood Samples ◽  
Melanoma Patients ◽  
Diagnostic Ions

Fourteen blood samples from patients with melanomas and 11 blood samples from healthy subjects were analyzed by matrix-assisted laser desorption/ionization mass spectrometry. The study focussed on species of low molecular weight, in the 800–5000 Da range, present in plasma and sera. While for healthy subjects plasma samples lead to the production of a higher number of ionic species, for melanoma patients a high number of diagnostic ions, present with high frequency and with quite high relative abundance, are present, in particular, in serum samples and, to a lesser extent, also in plasma. Since plasma samples are obtained more easily in comparison to sera, it is possible to suggest that plasma can also be used for these studies.

scholarly journals Effects of Delayed Sample Processing on Determination of Total and High Molecular Weight (HMW) Adiponectin in Serum and Plasma: A Pilot Study

2016 ◽  
Vol 8 (3) ◽  
pp. 19
Author(s):  
Choaping Ng ◽  
Felicity J Rose ◽  
Sahar Keshvari ◽  
Marina M Reeves ◽  
Goce Dimeski ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Pilot Study ◽  
High Molecular Weight ◽  
Accurate Determination ◽  
Mean Difference ◽  
Serum Samples ◽  
Blood Samples ◽  
Hmw Adiponectin ◽  
Total Adiponectin

<p>Adiponectin is a beneficial adipocyte-secreted hormone, which circulates in a variety of multimeric forms termed low and high molecular weight (LMW/HMW). Effectiveness of clinical therapeutic trials which target adiponectin rely on accurate determination of circulating total and HMW adiponectin levels but the accuracy may be influenced by variations in sample handling processes. The aim of this pilot study was to investigate the effects of delayed processing of blood samples on the concentration of total and HMW adiponectin.</p><p>Materials and Methods: Fasting blood samples were collected for analysis of total and HMW adiponectin concentrations in EDTA plasma and serum from eight healthy participants.  Samples were centrifuged post 15 min storage at 4<sup>o</sup>C as the comparative ‘ideal’ method or after up to 72 h of refrigerated storage or 6 h at room temperature. Total and HMW adiponectin concentrations were measured by ELISA.</p><p>Results: Under ideal handling conditions measurements of total and HMW adiponectin concentrations were significantly higher in serum than in plasma (mean difference: -1.3 µg/mL [95% CI: -1.6, -1.0], p&lt;0.001; and, -0.6 µg/mL [95% CI: -0.7, -0.5], p&lt;0.001, respectively).  Storage of blood samples at 4<sup>o</sup>C for 72 h resulted in significant reductions in concentration of total adiponectin in serum (mean difference: -1.4 µg/mL [95% CI: -2.0, -0.8], p=0.001) and HMW adiponectin in plasma (mean difference: -0.6 µg/mL [95%CI: -0.9, -0.2], p=0.007), compared with ideal conditions.  Further analysis of serum samples showed a significant decrease in total adiponectin concentration after 6 h storage at 4<sup>o</sup>C (mean difference: -1.4 µg/mL [95% CI: -2.0, -0.8], p=0.001) compared with ideal conditions.</p><p>Conclusions: Delayed processing of samples may have differential effects on the concentration of total and HMW adiponectin in serum or plasma. Larger studies are warranted for clinical intervention trials.</p>

scholarly journals Epidemiological aspects of the Brazilian spotted fever: serological survey of dogs and horses in an endemic area in the State of São Paulo, Brazil

1996 ◽  
Vol 38 (6) ◽  
pp. 427-430 ◽  
Author(s):  
Elba R.S. de Lemos ◽  
Raimundo D. Machado ◽  
José R. Coura ◽  
Maria A.A.M. Guimarães ◽  
Nelson Chagas
Keyword(s):  
Endemic Area ◽  
Spotted Fever ◽  
Domestic Animals ◽  
Sao Paulo ◽  
Spotted Fever Group ◽  
São Paulo ◽  
Serological Survey ◽  
Serum Samples ◽  
Blood Samples ◽  
Brazilian Spotted Fever

In order to obtain information on Brazilian spotted fever, a study in domestic animals was performed in the County of Pedreira, State of São Paulo, Brazil, where 17 human cases had been notified. Serum samples obtained from animals were tested by indirect immunofluorescence for detectable antibodies to spotted fever-group rickettsiae. Seropositivity was revealed in 12 (36.4%) of 33 dogs and seven (77.8%) of nine horses from the endemic area. For comparison, blood samples from dogs and horses from non endemic area were tested and four (12.9%) of 31 dogs and three (27.3%) of 11 horses were positive. The highest titers of antibodies by IFA (IgG > 1:1024) were found only in three dogs and six horses from endemic area. The results suggest that dogs as horses may serve as environmental sentinels for estabilishing the prevalence of foci of spotted fever in Brazil.

PSV-4 Determination of Deoxynivalenol (DON) Content in Biological Samples as an Indicator of DON Intake in Grower-finisher Pigs

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 206-207
Author(s):  
Michael O Wellington ◽  
Michael A Bosompem ◽  
Veronika Nagl ◽  
Daniel A Columbus
Keyword(s):  
Mass Spectrometry ◽  
Biological Samples ◽  
High Performance ◽  
Tandem Mass ◽  
Serum Samples ◽  
Blood Samples ◽  
Swine Diets ◽  
Direct Quantification ◽  
Serum And Urine

Abstract Due to difficulties in obtaining consistent and/or reliable measures of deoxynivalenol (DON) in complete swine diets, we investigated whether measuring DON in biological samples could be used as an indicator of DON ingestion in pigs. In this study, graded levels of DON (1, 3, or 5 ppm) were fed to grower-finisher pigs for a period of 77-d. On d 35 and 77 of the study, urine samples were quantitatively collected over a 24-h period and blood samples were collected between 3 – 4 h after the morning meal on each of those days for serum DON analysis. For direct quantification of DON in urine, high-performance liquid chromatography with tandem mass spectrometry was performed. For serum samples, indirect quantification of DON was performed via enzymatic hydrolysis. We observed that DON content in urine increased linearly as intake of DON increased (Fig.1A; P &lt; 0.05). Analysis of DON in serum follow a similar trend, where serum DON content was increased as DON intake increased (Fig.1B; P &lt; 0.05). An average of 30% of DON ingested was recovered as DON in urine over a 24-h period. In summary, there was a linear relationship between DON intake and DON content in both urine and blood serum, therefore, analyzing DON concentration in serum and urine could be used as a tool to estimate for DON exposure in pigs under controlled conditions.

Verification of Low-Density Lipoprotein Cholesterol Levels Measured by Anion-Exchange High-Performance Liquid Chromatography in Comparison with Beta Quantification Reference Measurement Procedure

2020 ◽  
Author(s):  
Daisuke Manita ◽  
Hiroshi Yoshida ◽  
Isao Koyama ◽  
Masakazu Nakamura ◽  
Yuji Hirowatari
Keyword(s):  
Anion Exchange ◽  
Clinical Laboratory ◽  
Measurement Procedure ◽  
Calculation Methods ◽  
Serum Samples ◽  
Cvd Risk ◽  
Blood Samples ◽  
Reference Measurement ◽  
Reference Measurement Procedure ◽  
Homogeneous Assays

Abstract Background A new lipoprotein testing method based on anion-exchange HPLC (AEX-HPLC) was recently established. We verified the accuracy of LDL-C levels, a primary therapeutic target for the prevention of cardiovascular disease (CVD), measured by AEX-HPLC comparing with LDL-C levels measured by beta quantification-reference measurement procedure (BQ-RMP), homogenous assays, and calculation methods. Methods We compared LDL-C levels measured by AEX-HPLC (adLDL-Ch: LDL-Ch and IDL-Ch) and BQ-RMP using blood samples from 52 volunteers. AdLDL-Ch levels were also compared with those measurements by homogeneous assays and calculation methods (Friedewald equation, Martin equation, and Sampson equation) using blood samples from 411 participants with dyslipidemia and/or type 2 diabetes. Results The precision and accuracy of adLDL-Ch were verified by BQ-RMP. The mean percentage bias [bias (%)] for LDL-C was 1.2%, and the correlation was y = 0.990x + 3.361 (r = 0.990). These results met the acceptable range of accuracy prescribed by the National Cholesterol Education Program. Additionally, adLDL-Ch levels were correlated with LDL-C levels measured by the 2 homogeneous assays (r &gt; 0.967) and the calculation methods (r &gt; 0.939), in serum samples from patients with hypertriglyceridemia. Conclusions AEX-HPLC is a reliable method for measuring LDL-C levels for CVD risk in daily clinical laboratory analyses.

THE INFLUENCE OF DIETARY MONENSIN ON THE LH RESPONSE TO GnRH OR ESTRADIOL AND THE OVULATORY RESPONSE TO PMSG IN GILTS

1990 ◽  
Vol 70 (4) ◽  
pp. 1085-1089 ◽  
Author(s):  
R. N. KIRKWOOD ◽  
P. A. THACKER ◽  
R. S. KORCHINSKI
Keyword(s):  
Weight Gain ◽  
Crude Protein ◽  
Recovery Period ◽  
Basal Diet ◽  
Feed Conversion ◽  
Serum Samples ◽  
Blood Samples ◽  
Time Interaction ◽  
Gnrh Infusion ◽  
Surge Height

To test the effects of monensin on endocrine responsiveness, 43 gilts of Yorkshire and Landrace breeding were individually fed a 16% crude protein basal diet (CT, n = 22) or the basal diet incorporating 33 mg kg−1 monensin (M, n = 21) for 25 d. Gilt weights and feed intakes were recorded at 7-d intervals for 21 d. Monensin did not significantly affect weight gain or feed intake but feed conversion was improved (P < 0.03). At 21 d, M (n = 6) and CT (n = 7) gilts were fitted with vena caval canulae and infused with 50 μg GnRH. Blood samples were obtained at 10-min intervals from 30 min before to 60 min after GnRH infusion. After a 48-h recovery period, these gilts received an injection of estradiol-17 B (E2) and further blood samples taken at the time of injection, at 24 and 36 h then at 6-h intervals until 78 h. All serum samples were assayed for LH and FSH concentrations. The LH response to GnRH was not affected by monensin, peak values being achieved in both groups 30 min after infusion. Serum FSH was not significantly influenced by GnRH in either group. Following E2 injection, the LH surge height was greater (P < 0.09) in monensin-fed gilts and a treatment by time interaction was evident (P < 0.001). Serum FSH was elevated in both groups but was unaffected by monensin. At 21 d, non-blood sampled gilts received an injection of 750 IU PMSG and were slaughtered 10 d later. An ovarian examination indicated that monensin-fed gilts tended (P < 0.1) to have a lower ovulation rate (13.2 ± 1.0 vs. 17.4 ± 1.9 for M and CT gilts, respectively). These data suggest that the feeding of monensin to gilts alters hypothalamic/pituitary responsiveness to stimulation and may enhance growth performance. Key words: Gilts, monensin, LH, FSH

scholarly journals Determinants and Measurement of Neonatal Vitamin D: Overestimation of 25(OH)D in Cord Blood Using CLIA Assay Technology

2019 ◽  
Vol 105 (4) ◽  
pp. e1085-e1092
Author(s):  
Mengdi Lu ◽  
Bruce W Hollis ◽  
Vincent J Carey ◽  
Nancy Laranjo ◽  
Ravinder J Singh ◽  
...  
Keyword(s):  
Vitamin D ◽  
Cord Blood ◽  
Late Pregnancy ◽  
First Trimester ◽  
Controlled Study ◽  
Positive Bias ◽  
Third Trimester ◽  
Serum Samples ◽  
Human Cord Blood ◽  
Blood Samples

Abstract Context Vitamin D (VD) deficiency in pregnancy and the neonatal period has impacts on childhood outcomes. Maternal VD sufficiency is crucial for sufficiency in the neonate, though the effect of early versus late pregnancy 25-hydroxy-vitamin D (25(OH)D) levels on neonatal levels is unknown. Furthermore, chemiluminescence immunoassays (CLIAs) are widely used, though their validity in measuring 25(OH)D specifically in cord blood specimens has not been established. Objective To assess the validity of a CLIA in the measurement of cord blood 25(OH)D and to evaluate maternal determinants of neonatal 25(OH)D, including early versus late pregnancy 25(OH)D levels. Design This is an ancillary analysis from the Vitamin D Antenatal Asthma Reduction Trial (VDAART), a randomized, double-blinded, placebo-controlled study. Participants and Intervention A total of 881 pregnant women at high risk of having offspring asthma were randomized to receive VD supplementation or placebo. Serum samples were collected from mothers in early and late pregnancy and from offspring cord blood at birth. 25(OH)D levels were assayed by CLIA in all maternal and offspring samples and by LC-MS/MS in all offspring samples and a subset of 200 maternal third trimester samples. Results Cord blood 25(OH)D levels were higher as measured by CLIA (mean 37.13 ng/mL [SD 18.30]) than by LC-MS/MS (mean 23.54 ng/mL [SD 11.99]), with a mean positive bias of 13.54 ng/mL (SD 12.92) by Bland-Altman analysis. This positive bias in measurement by CLIA was not observed in maternal samples. Third trimester 25(OH)D was a positive determinant of neonatal 25(OH)D levels. Conclusion Chemiluminescence immunoassays overestimate 25(OH)D levels in human cord blood samples, an effect not observed in maternal blood samples. The quantification of 25(OH)D by CLIA should therefore not be considered valid when assayed in cord blood samples. Third trimester, but not first trimester, maternal 25(OH)D is one of several determinants of neonatal 25(OH)D status.

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