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CH Diagnostic & Consulting Service, Inc. has participated in the EPA proficiency testing (PT) program since 1999.  Listed are our 2004 - 2006 recovery efficiency results.

CHD LT2 Approval Letter


 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
4/21/08 1 1.34 0 0.00 47 95 149.78 37
4/21/08 2 1.29 51 84.33 53 0 0.00 42
4/21/08 3 1.33 108 185.73 63 100 149.78 na
Mean Recovery (%) 59 65
RSD of % Recovery 3 4
No. of False Positives 0 0

 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
2/11/08 1 5.8 93 199.61 47 37 100.0 37
2/11/08 2 6.4 63 120.00 53 42 100.0 42
2/11/08 3 6.8 125 199.61 63 0 0.00 na
Mean Recovery (%) 54 40
RSD of % Recovery 15 9
No. of False Positives 0 0

 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
8/27/07 1 0.87 89 144.29 62 46 75.82 61
8/27/07 2 0.67 86 144.29 60 0 0.00 na
8/27/07 3 0.93 86 136.00 63 40 75.82 53
Mean Recovery (%) 62 57
RSD of % Recovery 3 10
No. of False Positives 0 0

 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
5/21/07 1 0.02 111 178.5 62 157 195.4 80
5/21/07 2 0.03 104 178.5 58 143 195.4 73
5/21/07 3 0.01 112 184.25 61 0 0.00 na
Mean Recovery (%) 60 77
RSD of % Recovery 3 7
No. of False Positives 0 0

 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
2/26/07 1 0.05 79 190.61 41 78 201.08 39
2/26/07 2 0.07 57 190.61 30 54 201.08 27
2/26/07 3 0.06 123 185.26 66 0 0 na
Mean Recovery (%) 46 33
RSD of % Recovery 41 26
No. of False Positives 0 0

 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
6/19/06 1 1.13 71 189.90 37 104 201.71 52
6/19/06 2 1.16 121 189.90 64 131 201.71 65
6/19/06 3 1.13 124 169.71 73 0 0 na
Mean Recovery (%) 58 58
RSD of % Recovery 32 16
No. of False Positives 0 0

 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
3/13/06 1 7.3 76 119.30 64 94 150.86 62
3/13/06 2 6.8 74 119.30 62 0 0 na
3/13/06 3 7.0 79 128.61 61 81 150.86 64
Mean Recovery (%) 62 58
RSD of % Recovery 2 11
No. of False Positives 0 0

 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
10/3/05 1 7.8 61 92 66 0 0 na
10/3/05 2 5.6 66 74.47 89 78 75.88 103
10/3/05 3 5.1 52 74.47 70 45 75.88 59
Mean Recovery (%) 75 81
RSD of % Recovery 16 38
No. of False Positives 0 0

 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
6/20/05 1 7.0 18 74.84 24 15 100.89 15
6/20/05 2 7.5 16 74.84 21 50 91 55
6/20/05 3 6.6 14 79.81 18 33 100.89 33
Mean Recovery (%) 21 34
RSD of % Recovery 16 59
No. of False Positives 0 0

 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
2/21/05 1 7.4 83 119.2 70 69 115.9 60
2/21/05 2 8.6 56 119.2 47 62 95.3 65
2/21/05 3 8.3 50 84.5 59 78 115.9 67
Mean Recovery (%) 59 64
RSD of % Recovery 19 6
No. of False Positives 0 0

 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
10/18/04 1 7.8 52 89.5 58 44 75.4 58
10/18/04 2 6.8 44 75.1 59 55 75.4 73
10/18/04 3 5.9 72 89.5 80 78 120.1 65
Mean Recovery (%) 66 65
RSD of % Recovery 19 11
No. of False Positives 0 0

 
Results from samples process with the FiltaMax foam filter (Idexx)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
10/4/04 1 1.44 33 74.9 44 0 0 na
10/4/04 2 1.29 31 74.9 41 36 127 28
10/4/04 3 1.41 53 150 35 21 76.1 28
Mean Recovery (%) 40 28
RSD of % Recovery 11 2
No. of False Positives 0 0

 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
6/28/04 1 7.0 50 101.2 49 42 100.0 42
6/28/04 2 6.4 0 0 na 0 0 na
6/28/04 3 5.9 34 85.0 40 37 100.0 37
Mean Recovery (%) 45 40
RSD of % Recovery 15 9
No. of False Positives 0 0

 
Results from samples process with the FiltaMax foam filter
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
6/14/04 1 1.33 38 85.1 45 23 75.3 31
6/14/04 2 1.03 24 100.6 24 46 100.8 46
6/14/04 3 1.43 0 0 na 0 0 na
Mean Recovery (%) 34 38
RSD of % Recovery 43 28
No. of False Positives 0 0

 
Results from samples process with the HV Envirochek Capsule (Pall-Gelman)
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
2/23/04 1 NR 0 0 na 0 0 na
2/23/04 2 NR 62 75.5 82 0 0 na
2/23/04 3 NR 76 99.7 76 55 75.2 73
Mean Recovery (%) 79 73
RSD of % Recovery 5 na
No. of False Positives 0 0

 
Results from samples process with the FiltaMax foam filter
Sample Date Sample ID NTU Cryptosporidium Giardia
oocysts counted oocysts spiked % recovery cysts counted cysts spiked % recovery
2/9/04 1 0.80 0 0 na 0 0 na
2/9/04 2 0.77 47 75.0 63 0 0 na
2/9/04 3 NR 65 101.1 64 51 75.8 67
Mean Recovery (%) 63 67
RSD of % Recovery 2 na
No. of False Positives 0 0

 

 

 

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Copyright 2005 CH Diagnostic & Consulting Service, Inc.
Last modified: June 11, 2007