Confirm the exact test
Check the test name, specimen type, drug panel, and whether alcohol biomarkers are included.
Preparation notes
Before your visit.
A few details to confirm now can help your collection go smoothly.
Check collection requirements
Ask the ordering party about identification, observation, chain of custody, timing, and reporting recipients. Requirements vary by order.
Ask about preparation
Confirm instructions with your collection site. For CDT, Quest lists fasting as preferred. Share relevant medication and hair-treatment information with the appropriate reviewer.
Bring your order and instructions
Have the requested paperwork and identification ready. Confirm the location and appointment arrangements before traveling.
Good to know
Does this guide replace my court order?
No. Use the order and the instructions from the responsible program or professional. Confirm any uncertainty with them before collection.
Can a result tell the exact day or amount of use?
Not reliably from these overview windows. USDTL cautions against assigning an exact dose or time from reservoir specimens such as hair and urine.
Are these my personal test results?
No. This is a public education guide. It does not contain or collect patient results, case details, or personal notes.
Where do the explanations come from?
USDTL provides the hair, PEth, and urine resources. Quest Diagnostics provides the CDT assay information. Each test page links to its original sources.