Tumour Marker Half Life
 

Calculates the half-life of a tumour marker from two serum levels separated by a time interval.

Whilst every effort has been made to ensure the accuracy of this programme, you use it at your own risk

Input initial serum level
Input final serum level
Input time interval between 2 levels          
   
   
Elimination Constant K =
Half-life t½  =

The formulae used are:

 kelim =

(ln(Cinitial) - ln(Cfinal)
tinterval
t½ = 0.693 / kelim

Original JavaScript by Steven Pon, MD, Weill Medical College of Cornell University.