USP 621色谱方法系统适用性里有提及,如果RSD要求为不超过的2.0%或更小数值的话进五针,如果RSD要求的为不超过大于2.0%的数值的话则药进六针,“Unless otherwise specified in the individual monograph, data from five replicate injections of the analyte are used to calculate relative standard deviation (SR) if the requirement is 2.0% or less; data from six replicate injections are used if the relative standard deviation requirement is more than 2.0%.”