Biomaterial Database

Diurnal rhythm of serum osteocalcin in normal children. 1998

C Heuck, and C Skjaerbaek, and O D Wolthers

Department of Paediatrics, Aarhus University Hospital, Denmark.

The aim of the present study was to assess diurnal levels of serum osteocalcin in normal children using a recently introduced fluoroimmunoassay (Pharmacia Osteocalcin CAP FEIA) measuring solely the intact peptide. Five girls and two boys aged 10.4-13.6 (mean 12.2) y were studied. Blood samples for determination of osteocalcin were collected every 2h throughout the day. A statistically significant rise in serum osteocalcin (F = 6.7, p < 0.001) with a peak at 08.00 h and a nadir lasting from 10.00 to 24.00 h was found. Trough and peak levels (at 16.00 and 08.00 h, respectively) were 41.6 +/- 6.8 and 66.0 +/- 10.5 microg l(-1) (mean +/- SEM). The circadian variation should be taken into consideration when single assessments of serum osteocalcin in children are performed.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D012016	Reference Values	The range or frequency distribution of a measurement in a population (of organisms, organs or things) that has not been selected for the presence of disease or abnormality.	Normal Range,Normal Values,Reference Ranges,Normal Ranges,Normal Value,Range, Normal,Range, Reference,Ranges, Normal,Ranges, Reference,Reference Range,Reference Value,Value, Normal,Value, Reference,Values, Normal,Values, Reference
D002648	Child	A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL.	Children
D002940	Circadian Rhythm	The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs or environmental and physiological stimuli.	Diurnal Rhythm,Nyctohemeral Rhythm,Twenty-Four Hour Rhythm,Nycthemeral Rhythm,Circadian Rhythms,Diurnal Rhythms,Nycthemeral Rhythms,Nyctohemeral Rhythms,Rhythm, Circadian,Rhythm, Diurnal,Rhythm, Nycthemeral,Rhythm, Nyctohemeral,Rhythm, Twenty-Four Hour,Rhythms, Circadian,Rhythms, Diurnal,Rhythms, Nycthemeral,Rhythms, Nyctohemeral,Rhythms, Twenty-Four Hour,Twenty Four Hour Rhythm,Twenty-Four Hour Rhythms
D005260	Female		Females
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000293	Adolescent	A person 13 to 18 years of age.	Adolescence,Youth,Adolescents,Adolescents, Female,Adolescents, Male,Teenagers,Teens,Adolescent, Female,Adolescent, Male,Female Adolescent,Female Adolescents,Male Adolescent,Male Adolescents,Teen,Teenager,Youths
D015200	Fluoroimmunoassay	The use of fluorescence spectrometry to obtain quantitative results for the FLUORESCENT ANTIBODY TECHNIQUE. One advantage over the other methods (e.g., radioimmunoassay) is its extreme sensitivity, with a detection limit on the order of tenths of microgram/liter.	Immunofluorometric Assay,Time-Resolved Immunofluorometric Assay,Assay, Immunofluorometric,Assay, Time-Resolved Immunofluorometric,Assays, Immunofluorometric,Assays, Time-Resolved Immunofluorometric,Fluoroimmunoassays,Immunofluorometric Assay, Time-Resolved,Immunofluorometric Assays,Immunofluorometric Assays, Time-Resolved,Time Resolved Immunofluorometric Assay,Time-Resolved Immunofluorometric Assays
D015675	Osteocalcin	Vitamin K-dependent calcium-binding protein synthesized by OSTEOBLASTS and found primarily in BONES. Serum osteocalcin measurements provide a noninvasive specific marker of bone metabolism. The protein contains three residues of the amino acid gamma-carboxyglutamic acid (Gla), which, in the presence of CALCIUM, promotes binding to HYDROXYAPATITE and subsequent accumulation in BONE MATRIX.	Bone Gla Protein,Calcium-Binding Protein, Vitamin K-Dependent,Gla Protein, Bone,Vitamin K-Dependent Bone Protein,4-Carboxyglutamic Protein, Bone,Bone gamma-Carboxyglutamic Acid Protein,4 Carboxyglutamic Protein, Bone,Bone 4-Carboxyglutamic Protein,Bone gamma Carboxyglutamic Acid Protein,Calcium Binding Protein, Vitamin K Dependent,Protein, Bone 4-Carboxyglutamic,Protein, Bone Gla,Vitamin K Dependent Bone Protein