Anytime you test yourself, you should always use the first void of the day when THCA concentrations would be at their highest. Taking the test during the latter parts of the day skews the results due to fluid consumption that occurs during the normal course of the day. The fluid consumption dilutes the THCA concentration to where a urine sample can register a negative on an assay. This dilution phenomena is only temporary - once the fluids ingested had all been urinated out, the bladder is replenished with fresh THCA-laden urine and thus the donor is right back to square one.

By using the first void, you are testing yourself under the "worst-case scenario". If youre consistently testing negative under that "worst-case scenario", youre good to go. :thumbsup:


But no one uses the first void on an actual Urinary Test, from what I understand.
And youre not going to use the first void for the actual U/A - unless you have been consistently testing negative with the first void to where youre comfortable at submitting the first void on the day of the U/A.

A person who had tested negative with the 5th void of the day on a 4 PM home test on Tuesday in no way, shape, or form means that the person will test negative with the 5th void on 4 PM the next day. The human body is not some kind of electronic machine operating on fixed settings (thank god for that!). THCA concentrations fluctuate day by day - something that is evident whenever fluid consumption is involved.