Make a Medicine and Supplement List for Your Lab Appointment

Bring a current list of what you take to the laboratory-planning conversation. Medicines and supplements can affect testing in different ways, and the ordering team needs the actual products rather than a vague description such as “a few vitamins.”

Use five columns

Include prescriptions, over-the-counter products, vitamins, powders, herbal products, and occasional medicines. Do not assume a hair-and-nail supplement is irrelevant: biotin can interfere with some thyroid assays.

Resolve uncertainty before the appointment

If you cannot identify a product, bring the package or a clear photograph of the ingredient label. Keep this information private. Ask the clinician or pharmacist to help reconcile duplicates or unclear names; this worksheet does not decide which products you should take.

Tell the ordering team if use has changed since the order was written. A list copied from an old portal may no longer describe your current routine.

Write instructions beside the product

If the clinician gives a preparation instruction, record who gave it, what it applies to, and the timing. Ask for clarification if the laboratory sheet and clinician advice appear to conflict. Do not independently stop a prescription or apply one supplement's instruction to every product.

Bring the list to collection if requested and retain it with the test date. If a result later seems unexpected, the timeline may help the clinician decide what information is relevant.

The goal is accurate communication. It is not to remove every possible influence from your body or manufacture an ideal baseline. Follow the plan appropriate to the ordered tests and your medical circumstances.