The blood test is typically used to check for diseases/other health-related issues, rather than THC use. Thats where the urine test comes into play.

THC is detectable in the blood for 2-5 days depending on pattern of use. Thats why urine is the preferred specimen for THC use over the blood specimen.
Burnt Toast Reviewed by Burnt Toast on . Life Insurance Applied for a life insurance policy thru State Farm, I know they'll take blood and urine. The blood doesn't worry me and I planned on subbing for the urine with Quick Fix as I have had success with it in the past. My question is what happens if my blood test results show things the urine test does not? Rating: 5