TABLE 2.

Quality control samples for Cryptosporidium analysis with method 1623

SampleDate (mo/day/yr)% Recovery (RSD) witha:Method blank% IMS controls (RSD)
Viable oocystsColorSeedPositiveNegative
IPR samples
    112/04/200145340700
    212/11/200147400640
    301/08/200241550690
    401/29/200223310660
Avg39 (28)b40 (27)b67 (4)
OPR samples
    107/08/200255510820
    212/09/200247410760
    306/10/20035752050d0
Avg53 (10)c48 (13)c079 (5)0
  • a RSD is the relative standard deviation.

  • b Acceptable range for recovery is 24 to 100%; acceptable maximum RSD is 55%.

  • c Acceptable range for recovery is 11 to 100%.

  • d Slide was dropped and cracked, so counts are underestimated; this value was not used in average and statistical analyses.