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TRACP-5b (Tartrate-Resistant Acid Phosphatase-5b)

Analyte: Tartrate-resistant acid phosphatase-5b

Specimen Type: Serum, Inquire for additional option(s)

Optimum Volume: 0.5 mL


2-8°C -20°C -70°C
1 day 2 months 1 year

Reporting units: U/L

Method: ELISA

Biological or Clinical Significance:

Tartrate-resistant acid phosphatase (TRACP) is expressed in bone-resorbing osteoclasts and secreted into the circulation. Thus, serum TRACP has been considered as a potentially useful marker of bone resorption rate.

BoneTRAP® is specific for circulating osteoclast-derived TRACP-5b. BoneTRAP® detects only the active TRACP molecules that are freshly liberated in the circulation. It does not detect old circulating inactive TRACP molecules or fragments. Thus, BoneTRAP® gives an accurate estimation of the amount of bone resorption rate at the time of sample taking.

Principle of Test Method:

The TRACP-5b assay is a solid-phase ELISA designed to measure human TRACP-5b in serum or plasma. It is an immunofixed enzyme activity assay.


1. Nakanishi M, Yoh K, Miura T, Ohasi T, Rai S. K., Uchida K. Development of a Kinetic Assay for Band 5b Tartrate-resistant Acid Phosphatase Activity in Serum. Clin Chem. 2000; 46:4; 469-473.

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