| Business | Phone |
| Am Labs 13541 Weston Park Dr, St Louis 63131 | (314) 275-3776 |
| O'Neal Scientific Svc 6652 Gravois Ave, St Louis 63116 | (314) 352-7570 |
| N P Analytical Laboratories 824 Gratiot St, St Louis 63102 | (314) 982-1310 |
| Missouri Analytical Lab Inc 1820 Delmar Blvd, St Louis 63103 | (314) 241-8772 |