title: [Study of the isoenzymes of lactate dehydrogenase: frequent values in relation to age in children, study of conservation (author's transl)].
abstract: In this study we were able to evaluate the total lactate dehydrogenase activity of serum of children year by year. We also defined by electrophoresis the normal isozyme profile for each age group. We noted that the total activity was higher during the first years of life and that during this period, the isoenzymic profile was different from that of adults: higher percentage of LDH 5 (13% as against 8% in adults) and a lower percentage of LDH 1 (19% as against 24% in adults). Furthermore, it seemed to us preferable to determine the total LDH activity on fresh serum for a fall in activity is noted both after preservation at + 4 degrees C and -20 degrees C. Similarly, it is preferable to trace the isoenzyme profile on the same day rather than after preservation of the samples. The average differences show clearly the disappearance of certain fractions (isoenzymes 4 and 2 after six days preservation at + 4 degrees C). However, each serum seems to behave in a somewhat unforseeable manner and the dispersion of individual variations makes any statistical interpretation impossible.
mesh_terms: D000367:Age Factors; D001793:Blood Preservation; D002648:Child; D002675:Child, Preschool; D004588:Electrophoresis, Cellulose Acetate; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007527:Isoenzymes; D007770:L-Lactate Dehydrogenase / Q000097:blood*; D008297:Male
chemical_list: D007527:Isoenzymes; D007770:L-Lactate Dehydrogenase
vernacular_title: Etude des isoenzymes de la lactate déshydrogénase: valeurs fréquentes en fonction de l'âge chez l'enfant, étude de la conservation.