Dr bill or whoever,

Is the only way to administer a peth test through blood or can it be done with a urine test as well?

Blood only.

Blood only.

Thank you as for the length of time the test can go back is it over a month?
They say three or four weeks?

thank you as for the length of time the test can go back is it over a month?
they say three or four weeks?

That's debatable. Most sources say about 2 weeks but this test is little used there is no track record.