Quantitative analysis of samples using a Four Parameter Logistic (4PL) curve fit suitable for calculating concentrations in accordance with the GenWay AFP (alpha fetoprotein) ELISA kit. The standard data points (concentration vs. measurement) are plotted on semi-log axes and a 4PL is fitted through the points. The concentrations of the samples are determined from the fit with any specified dilution factors applied. The %CV, Standard Deviation and Standard Error are calculated for each replicated sample. Samples outside the range of the standards or the fit (greater than the upper asymptote or below the lower asymptote) are highlighted in yellow.