BACKGROUND: Thyroglobulin (Tg) is the primary biochemical marker used to monitor patients with differentiated thyroid cancer (DTC) for residual or recurrent disease after total thyroidectomy, as only normal or well-differentiated malignant thyroid cells produce Tg. Here, we evaluated the precision and functional sensitivity (FS) of a recently developed highly sensitive Tg (hsTg) electrochemiluminescent immunoassay (ECLIA) and compared it to that of the radioimmunoassay (RIA) method using pooled human serum with low levels of Tg. METHODS: For the ECLIA method, the Elecsys Tg II kit (Roche Diagnostics, Germany) was used with an E170 analyzer (Roche Diagnostics). For the RIA method, the Tg-plus-RIA kit (BRAHAMS, Germany) was used with a Cobra Quantum gamma counter (Packard Instrument Company, USA). The precision and limit of detection (LOD) were determined according to the Clinical and Laboratory Standards Institute (CLSI) guidelines. FS was determined using a modification of the CLSI guideline. RESULTS: The total precision of the hsTg ECLIA and RIA methods was 9.6% and 48.2%, respectively. The manufacturer-reported LOD was verified by the hsTg ECLIA (0.04 ng/mL), but not by the RIA method (>0.08 ng/mL). The hsTg ECLIA showed better FS (0.04 ng/mL at a coefficient of variation [CV] of 10%) than the RIA method (0.37 ng/mL at a CV of 20%). CONCLUSIONS: Thus, the hsTg ECLIA performed better than the RIA method in terms of FS, which is extremely important for the early detection of residual or recurrent disease in DTC patients after total thyroidectomy. The excellent performance of the hsTg ECLIA could allow for clinical Tg measurement without thyroid-stimulating hormone stimulation, in contrast to the insufficient performance of the RIA method.
Biomarkers ; Elapidae ; Humans ; Immunoassay* ; Limit of Detection ; Methods ; Radioimmunoassay* ; Thyroglobulin* ; Thyroid Gland ; Thyroid Neoplasms ; Thyroidectomy ; Thyrotropin

BACKGROUND: We evaluated overall performance and analysis time of newly developed HLC-723 G8 (Tosoh corp., Tokyo, Japan) HbA1c autoanalyzerwhich utilizes cation-exchange HPLC method. METHODS: Linearity, precision, correlation with Variant II Turbo (Bio-Rad Laboratories, Hercules, CA, USA), analysis time, labile HbA1c (L-A1c) separation ability and stability of refrigerated sample at 4degrees C were evaluated. RESULTS: HLC-723 G8 showed good linearity between HbA1c 4.9-12.0% range (R2=0.9995). Within-run and total imprecision (CVs) were less than 1.0%. Correlation with Variant II Turbo and L-A1c separation ability were excellent. Analysis time per sample took 1.0 min. Stability of refrigerated sample at 4degrees C for at least 21 days was good. CONCLUSIONS: HLC-723 G8 showed good analytical performance and its rapid analysis time enables us to support outpatient diagnosis of diabetic patients efficiently.
Chromatography, High Pressure Liquid ; Humans ; Outpatients ; Tokyo

Background: Clinical specimens are valuable materials that require a traceable management system. Maintenance of temperature and loss prevention during transport are important for the reliability of the clinical test results. Current transportation systems can suffer from temperature changes and agitation. Quality improvement in this pre-analytic phase is required. This study acquired preliminary data from a newly developed specimen transportation system adopting a real-time temperature monitoring during transportation using temperature sensor and global positioning system to establish appropriate guidelines. Methods: Temperature preservation performance was compared between two transportation boxes (newly developed one [A] and conventional one [B]) at exterior temperatures of 35℃ and ?18℃, reflecting the extreme temperature range in Korea. Influences of the temperatures on analytical results of whole blood, serum, plasma, and urine specimens were investigated, as were the effects of vibration. Results: The interior temperature of box A measured at multiple sites was maintained within 1.0?9.0℃ at both exterior temperatures. The interior temperature of box B was outside of this range. The analyzed parameters varied comparably with the variations occurring at the recommended and published storage temperature. Vibration affected nonspecific enolase and lactate dehydrogenase. Conclusions Temperature preservation and real-time monitoring during specimen transportation are important. The present data highlight the importance of transportation conditions and indicate that laboratories should know the characteristics of temperature changes in their transportation system.

Acute promyelocytic leukemia (APL) is considered as a curative disease after combined chemotherapy based on all-trans retinoic acid (ATRA) and anthracycline. However, as long-term survivors continue to increase, reports on sporadic cases of therapy-related myeloid neoplasm (t-MN) after successful APL treatment are also increasing. Recently, we have experienced one patient who developed t-MN 7 yr after APL diagnosis. Even though he had not been exposed to alkylating agents at all, he showed alkylating agents-associated features such as long latency period (>5 yr), first presentation as myelodysplatic phase (multilineage dysplasia with increased blasts), and complex karyotype including monosomy 5 and 7. He received only supportive care and expired 3 months after the diagnosis of t-MN (6 months of survival after the onset of cytopenias). t-MN after complete remission of APL is a rare but fatal complication, and patients with complex karyotypes show ominous prognosis in particular. For the early diagnosis of t-MN, long-term and close monitoring of the patient is needed. One should suspect this late complication whenever any unknown cytopenia develops, and should perform bone marrow biopsy and cytogenetic analysis.
Alkylating Agents ; Biopsy ; Bone Marrow ; Cytogenetic Analysis ; Early Diagnosis ; Humans ; Karyotype ; Latency Period (Psychology) ; Leukemia, Promyelocytic, Acute ; Monosomy ; Prognosis ; Survivors ; Tretinoin

BACKGROUND: Novel swine influenza (H1N1) was first identified in Mexico in April 2009. Because of its high infectivity and worldwide distribution, a rapid and efficient screening test is necessary. Here we evaluated the usefulness of a rapid antigen test currently in use, compared to real-time RT-PCR (rRT-PCR) as a screening test for detection of novel swine influenza (H1N1). METHODS: A total of 1,228 patients who visited Hallym University Kangdong Sacred Heart Hospital with influenza-like illness between 14 August 2009 and 30 September 2009, and were tested by both rapid antigen and rRT-PCR tests, were enrolled in this study. RESULTS: Sensitivity, specificity, predictive value of a positive test, and predictive value of a negative test for the rapid antigen test were 30.5%, 99.2%, 86.4% and 90.1%, respectively. Fifty-one (4.2%) patients were positive for both rapid antigen test and rRT-PCR, and 1,053 (85.7%) were negative for both rapid antigen test and rRT-PCR. A total of 124 (10.1%) patients showed a discrepancy between the two tests. Among them, 116 (9.4%) were only positive for rRT-PCR and 8 (0.7%) were only positive for the rapid antigen test. The latter 8 patients all showed negative H1/M2 results in rRT-PCR. There were significant differences in detection rates of the rapid antigen test between different H1 Ct (threshold cycle) interval groups and for different age groups (P<0.05). CONCLUSION: Although the rapid antigen test is easy to perform and provides fast results, its limits as a screening test for detection of novel swine influenza (H1N1) due to its low sensitivity compared to rRT-PCR need to be considered in practical situations.
Heart ; Humans ; Influenza, Human ; Mass Screening ; Mexico ; Real-Time Polymerase Chain Reaction ; Reverse Transcriptase Polymerase Chain Reaction ; RNA-Directed DNA Polymerase ; Sensitivity and Specificity ; Swine