Kittens can be tested as early as six weeks of age.
No test is （or ever will be）100% accurate, but the current tests for FeLV are generally very good.
We strongly recommend testing every cat, whether an adult or kitten, for the FIV virus.
You can use Feline Leukemia Virus Antigen Test Kit.
You can use Real-time PCR to detect FCV.
CPV fecal antigen ELISA kits are used to diagnose FPV infection.
You can test an FVR by Real-time PCR ，or take it to a lab.
You can use Feline Herpesvirus FHV Ag Rapid Test Kit. It is convenient and easy to operate.
you can choose the direct fluorescent test or real-time PCR test.