Spear Bio Products & Reviews

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Spear Bio – founded in 2021 and headquartered in Woburn, Massachusetts – is an innovative leader in providing scalable solutions for ultra-sensitive protein biomarker measurements. Spear Bio’s proprietary technology, Successive Proximity Extension Amplification Reaction (SPEAR), employs a unique 2-factor authentication mechanism to precisely measure protein biomarkers at attomolar level from sub-microliter sample volume. Spear Bio is focused on leveraging its technology’s unprecedented sensitivity to transform protein research and early disease diagnosis.

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SPEAR UltraDetect™ BD-pTau 217 Assay Kit

Spear Bio

The SPEAR UltraDetect™ BD-pTau 217 Assay enables highly sensitive and precise quantification of brain-derived pTau 217 in plasma. The only BD-pTau 217 assay delivering 100% quantifiability across healthy and diseased samples using just 1 µL of diluted plasma in a homogenous, wash-free format — enabling robust early detection, stratification, and longitudinal analysis of this ultra-low abundance biomarker. Verified for plasma s…

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