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Upcoming holiday closures 

Quest Patient Service Centers will be closed on Friday, July 3 and Saturday, July 4, 2026, in observance of Independence Day, and to give our frontline team the time to recharge. Don't let the holiday interrupt your care. Plan your visit today.

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Cerebrospinal Fluid Aβ42, Total Tau, and Phosphorylated Tau in the Evaluation of Alzheimer’s Dementia: Experience From a Commercial Reference Laboratory