| Business | Phone |
| California Diagnostic Labs 1300 W 155th St # 103, Gardena 90247 | (310) 538-3463 |
| C H Laboratory 1243 W 130th St, Gardena 90247 | (310) 527-4619 |
| California Diagnostic Supplies 1300 W 155th St, Gardena 90247 | (310) 515-4997 |
| Marco Labs Inc 1970 W 139th St, Gardena 90249 | (310) 527-4333 |