measurement method Phosphorylated Tau Protein to Amyloid Beta1-42 Ratio Measurement PTAUAB42 A relative measurement (ratio) of the phosphorylated Tau protein to amyloid beta 1-42 in a biological specimen. Phosphorylated Tau Protein/Amyloid Beta 1-42 Phosphorylated Tau Protein to Amyloid Beta1-42 Ratio Measurement CDISC Laboratory Procedure C176312 Phosphorylated Tau Prot/Amyloid Beta1-42 The determination of the ratio of phosphorylated Tau protein compared to amyloid beta 1-42 present in a sample. The measurement may be expressed as a ratio or percentage. Phosphorylated Tau Protein to Amyloid Beta1-42 Ratio Measurement