Bone-avid tracers, such as 99mTc-DPD (technetium-3,3-diphosphono-1,2-propanodicar-boxylic acid), 99mTc-PYP (technetium-pyrophosphate), and 99mTc-HMDP [technetium-hydroxymethylene diphosphonate (Tc-HMDP)] have been implicated to have high sensitivity and specificity for diagnosing cardiac amyloidosis and differentiating it from other cardiomyopathies with HFpEF. Combination of grade 2 or 3 cardiac uptake on a bone-avid tracer scan in the setting of absent monoclonal protein by serum immunofixation electrophoresis (IFE), urine IFE, and serum free light chain assay is diagnostic of<unk> (senile) cardiac amyloidosis.
Wild-type 
Mosaic 
Nuclear isomer
Short tandem repeat
Open reading frame
Imogene King
Outlier
HAZMAT Class 2 Gases