Table 4.

Removal of amplification inhibitors by various treatments

TreatmentDilutionNo. of urine specimens rendered noninhibitory/total no. tested (%) for the following:
PCRLCRTMA
4°C overnight1:18/19 (42.1)5/9 (55.5)19/24 (79.1)
1:414/19 (73.6)7/9 (77.7)22/24 (91.6)
1:1016/19 (84.2)9/9 (100)22/24 (91.6)
−70°C overnight1:111/19 (57.9)4/9 (44.4)19/24 (79.1)
1:414/19 (73.6)9/9 (100)22/24 (91.6)
1:1016/19 (84.2)9/9 (100)22/24 (91.6)
Phenol-chloroform1:119/19 (100)9/9 (100)24/24 (100)
1:419/19 (100)9/9 (100)24/24 (100)
1:1019/19 (100)9/9 (100)24/24 (100)