In less than 5 minutes, elevated levels of human hemoglobin as low as 0.05 ugHb/mL can be detected and positive results for high levels of hemoglobin can be seen in the test as early as 1 or 2 minutes.. Abstinence of food and drugs before taking this test is not necessary.. Box contains 30 test cassettes; 50 collection tubes (contains phosphate buffer solution) and 50 patient specimen collection and return kits.. Each return kit includes: patient instructions, two collection papers, specimen pouch with absorbent and a return mailer..