TABLE 4.

Demonstration of assay linearitya

GroupSlope95% CI
Lower limitUpper limit
1−0.9990−1.0318−0.9662
2−0.9910−1.0348−0.9472
3−0.9802−1.0180−0.9423
4−0.9976−1.0722−0.9230
  • a Ten samples with concentrations between 100 and 51,895 mIU/ml were grouped into four groups according to the predilution applied to reach the upper limit of the analytical range. Shown are the estimated slope for each predilution group with its 95% CI using a mixed model with log dilution, group, and samples as factors.