A method for the analysis of the drug diazepam in blood consistently produces results that are low by -5.4%. If the measured concentration of diazepam in a patient’s blood sample is 2.02 ppm, what must be the actual concentration in their blood (in ppm)?

Question

A method for the analysis of the drug diazepam in blood consistently produces results that are low by -5.4%.  If the measured concentration of diazepam in a patient’s blood sample is 2.02 ppm, what must be the actual concentration in their blood (in ppm)?

DrBob222 · Answer

E = experimental A = actual ------------ [(E-A)/A] = -0.054 [(2.02-A)/A] = -0.054 Solve for A