Objectives
Pediatric Reference Intervals in China (PRINCE) is a nationwide initiative that aims to establish and validate harmonized reference intervals (RIs) for Chinese children and adolescents, in which 15,150 healthy volunteers aged up to 20 years were recruited from 11 centers to establish RIs and 7,557 children and adolescents were enrolled from 21 centers to validate RIs.
Methods
The complete blood cell counts (CBC) of venous whole blood were measured by hematology analyzers through Sysmex systems in different centers. Age- and sex-specific RIs were calculated according to the guidelines.
Results
Unlike adults with certain levels of analyte concentrations, hematological parameters of children changed through growth and development. Red blood cell counts, hemoglobin, and hematocrit increased with age, and revealed higher concentrations in boys than girls after puberty. White blood cell counts and platelet counts showed significant higher levels than adults before 2 years of age, and then gradually decreased without distinct sex differences. In addition, lymphocyte counts decreased with age while neutrophil counts showed an opposite trend. The lower and upper limits of pediatric RIs of CBC were different from those of adults.
Conclusions
The validation of RIs indicated that the PRINCE study provided a version of RIs suitable for most of regions in China. This first harmonized pediatric RIs of CBC across China provided a robust database to understand the dynamic changes of hematologic parameters from birth to adolescence, and will contribute to clinical diagnosis and prognosis evaluation for pediatric patients as well.
The weldability of magnesium alloy T-joint using laser-TIG hybrid welding heat source with cold filler wire was studied in this paper. The effects of welding parameters (wire feeding angle ¡, wire feeding speed V W , welding speed V, shielding gas flow rate acts on either of the connect corner Q C , the distance between filler wire and laser beam D LW ) on weld appearance and penetration were discussed. Results show that highquality magnesium alloy T-joint can be achieved by adjusting the parameters. Shearing test result indicates that shear strength of the T-joint welded by laser-TIG heat source can be as high as 92.3% of that of base metal.
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