Final answer:
The most accurate urine specimen for a pregnancy test is first-morning urine, which is collected in the morning before consuming any food or drinks.
Step-by-step explanation:
The most accurate urine specimen to use when doing a urine pregnancy test is the first-morning urine.
First-morning urine is the urine sample collected in the morning after a night's sleep and before consuming any food or drinks. This urine is more concentrated and contains higher levels of the pregnancy hormone human chorionic gonadotropin (hCG), making it the most accurate specimen for pregnancy testing.
Using first-morning urine can help maximize the accuracy of the test, especially in the early stages of pregnancy when hCG levels are still low.