LOINC Code 106939-2: Amyloid plaques probability score Calc Nom (P)

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Amyloid plaques probability score. It is commonly used with the system or sample type Plas.

When is it used?

• Used in lab systems, EHRs, and clinical data exchange.
• May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
• Status: ACTIVE
• Order vs observation: Both
• Method: Calculation

What it does not mean

• The code identifies the observation or test, not the actual result.

Key facts

• Amyloid probability score in Plasma by Calculation
• Amyloid plaques probability score
• The term repersents The PrecivityAD2™ test. This test is an analytically and clinically validated blood test designed to assist healthcare providers in diagnosing Alzheimer's disease (AD) in patients with mild cognitive impairment or dementia. It quantifies specific plasma amyloid beta and tau peptides using liquid chromatography-tandem mass spectrometry (LC-MS/MS) to calculate the Aβ42/40 and p-tau217/np-tau217 ratios. These ratios are combined in a proprietary algorithm to produce the Amyloid Probability Score 2 (APS2), a numerical value from 0-100 that indicates the likelihood of brain amyloid plaques. By providing a non-invasive alternative to PET scans, the PrecivityAD2™ test enhances diagnostic accuracy while mitigating the effects of confounding factors.
• Alzheimer disease; Alzheimer's disease; Amyloid plaques score; APS; Calc; Calcn; Calculated; Nominal; Pl; Plasma; Plsm; Point in time; Random; Scale; Scre; Serology

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Frequently asked questions