Diagnosing Acute Heart Failure (AHF): A Validated Prediction Model  
  Risk Factor Value  
  Age (yrs)  
  Estimated Pre-Test Probability of AHF ( 0 to 1.0 )  
  NT-proBNP Level  
  Probability That Acute Heart Failure Is Present  
  Improving the Diagnosis of Acute Heart Failure Using a Validated Predicition Model. Steinhart, B, et al. J Am Coll Cardiol 2009;54:1515–21.  
  Calculator Design and HTML transfer by Dr. John Coyle. 2009.