IS 105% recovery acceptable

[Juan2011]

I am extracting an analyte from a polymer emulsion by precipitaiing the polymers along with water. I am getting a recovery of 106%,105% and 104% at 1st 2nd and 3rd level.The average recovery is 105%. Is this ok or shall I consider changing the extraction method.My boss really does not want to change the method because of the time and cost we have done already for this method.

[Consumer Products Guy]

Food and Drug Administration, ORA Laboratory Procedure ORA-LAB.5.4.5, version 12, revised 9-9-2005, including Appendix I, gives a range of 95-105% recovery acceptable for spiked samples.

[Juan2011]

Thank you for Consumer Products Guy