Assessment of the serum levels of bone alkaline phosphatase with a new immunoradiometric assay in patients with metabolic bone disease
The authors measured serum bone alkaline phosphatase (B-ALP) with a new immunoradiometric assay (IRMA) in a large sample of healthy controls comprising 173 women and 180 men, 20-88 yr of age, and in patients with metabolic bone disease. Using serum samples from patients with liver disease and patients with Paget's disease with elevated total alkaline phosphatase (T-ALP) as a source of, respectively, liver and bone isoenyzmes, they determined a liver cross-reactivity of the IRMA of 16% that was confirmed by electrophoresis of the circulating alkaline phosphatase isoenzymes. The IRMA was linear for serial sample dilutions, the recovery ranged from 89-110%, and the intra- and interassay variations were below 7% and 9%, respectively. B-ALP increased linearly with age in both sexes, and the mean B-ALP serum levels were not significantly different for women and men (11.3 [+-] 4.8 ng/mL for women; 11.0 [+-] 4.0 ng/mL for men). The increase in B-ALP after the menopause was significantly higher than that in T-ALP (+77% vs. +24%; P<0.001). When the values of postmenopausal women were expressed as the SD from the mean of premenopausal women, the mean Z scores were 2.2[+-] 1.8 for B-ALP and 0.9 [+-] 1.3 for T-ALP (P<0.001 between the two).
- OSTI ID:
- 5042715
- Journal Information:
- Journal of Clinical Endocrinology and Metabolism; (United States), Vol. 77:4; ISSN 0021-972X
- Country of Publication:
- United States
- Language:
- English
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ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
62 RADIOLOGY AND NUCLEAR MEDICINE
ALKALINE PHOSPHATASE
RADIOIMMUNOASSAY
RADIOMETRIC ANALYSIS
BLOOD SERUM
BONE TISSUES
ANIMAL TISSUES
BIOASSAY
BODY
CHEMICAL ANALYSIS
CONNECTIVE TISSUE
DIAGNOSTIC TECHNIQUES
ENZYMES
ESTERASES
HYDROLASES
IMMUNOASSAY
ISOTOPE APPLICATIONS
ORGANIC COMPOUNDS
PHOSPHATASES
PROTEINS
QUANTITATIVE CHEMICAL ANALYSIS
RADIOASSAY
RADIOIMMUNODETECTION
TISSUES
TRACER TECHNIQUES
400101* - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
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