Specialty Testing Guide › Heavy Metals Testing
Good preparation for a heavy metals test comes down to a few things: tell your clinician about recent seafood, supplements, contrast dye from scans and any past chelation, and follow the collection instructions that come with your test exactly. Each of these can push a result up or make it hard to read.
YoungerMeMD's current $89 unprovoked test is a urine test from Doctor's Data. The clinic's prep is to skip fish, shellfish, seaweed and algae products for at least 3 to 7 days, pause non-essential supplements and over-the-counter medicines for 48 hours before and during collection, and wait at least 96 hours after any scan with contrast dye. This guide covers each step and why it matters.
Key takeaways
- For the clinic's urine test, prep centers on seafood, supplements and medicines, and any recent scan with contrast dye.
- Fish and shellfish in the days beforehand can make urine arsenic look far higher than it really is.
- MRI contrast can distort some urine element readings, so mention any recent scan.
- Recent chelation or "detox" products can skew urine results and should be disclosed.
- An honest exposure history helps the clinician read your result more than any single number.
Seafood and urine arsenic
Fish and shellfish contain organic arsenic compounds that pass harmlessly into urine. They show up in a total arsenic result and can make it look alarming. One review of clinic patients found that seafood eaten within two to three days of testing can raise total urine arsenic, and that the elevations they saw were due to benign organic arsenic from seafood.1
The effect can last longer than people expect. In one published case, a man had an extremely high urine arsenic level five days after eating two lobster tails; speciation showed it was the harmless seafood form, and a repeat test after avoiding seafood was far lower.2 The clinic's test reports total arsenic, so avoid all fish, shellfish, sushi and seaweed such as kelp for at least 3 to 7 days before collection, and tell our team what you ate in the week before. See arsenic urine tests and seafood for more.
Contrast dye from scans
If you have had an MRI with gadolinium contrast, or any scan that used contrast dye, mention it. Researchers found that a gadolinium contrast agent given shortly before urine collection caused readings for some elements that were far above expected ranges, because of interference in the lab instrument.3 For the clinic's test, wait at least 96 hours (4 days) after an MRI, CT scan or X-ray that used contrast dye, whether gadolinium, barium or iodine, before collecting.
Supplements, medicines and "detox" products
Bring a complete list of your prescriptions, over-the-counter medicines and supplements to your assessment, including anything sold for detox or chelation. Chelating agents pull metals into the urine, which is exactly why provoked tests overstate burden. If you have had chelation, the American College of Medical Toxicology advises waiting several days after the last dose before a 24-hour urine collection.4
For the clinic's test, pause non-essential vitamins, minerals, herbal remedies and over-the-counter medicines for 48 hours before and during collection. Kelp, spirulina and other algae products count with seafood, so stop them 3 to 7 days ahead. Never stop a prescribed medicine without talking to the clinician who prescribed it.
Timing: what the test can and cannot see
Blood and urine tests mostly reflect recent exposure. ATSDR estimates that lead in adult blood has a half-life of about 28 days, while lead stored in bone can stay for decades.5 A test months after a short exposure may look normal, and a test during an ongoing exposure will reflect it. Tell your clinician when the exposure you are worried about happened.
If you are testing to check whether a change worked, such as replacing old plumbing or cutting back on high-mercury fish, ask how long to wait after the change before retesting.
What to bring to your assessment
- The age of your home and any recent renovation, sanding or window work.
- Your water source: public water, or a private well and when it was last tested.
- Your job and hobbies, such as welding, battery work, shooting ranges, stained glass or ceramics.
- How often you eat fish, including sport fish from Pennsylvania waters.
- Copies of any past blood lead or metal test results.
- Your full medication and supplement list.
For help reading the report afterward, see how to read a heavy metals report.
What collection is like
The clinic has confirmed that the current test uses no provocation agent, so you will not be given a chelating drug before collection. The test is a urine collection using a Doctor's Data kit, and the kit's instructions explain how to collect the sample and send it back. Use only the acid-washed containers that come in the kit, and do not collect while you are menstruating. Follow the instructions exactly, and ask our team if any step is unclear.
Next step: ordering the test
Heavy Metals Testing is an $89 add-on selected at checkout with the $599 Peptide Assessment or the $724 Hormone Assessment on the payment page. Visits are in person at the Conshohocken office in Montgomery County or by telehealth for patients located in Pennsylvania. Interpretation and planning come with membership, and the test kit is billed separately. Testing is self-pay through the clinic; ask our team about receipts for your own insurer or HSA. Questions about prep, specimen or timing can go to the team through the contact page. For the local logistics, see heavy metals testing near Philadelphia.
Frequently asked questions
Do I need to fast before a heavy metals test?
The clinic's prep for this urine test covers seafood, supplements, over-the-counter medicines and contrast scans, not fasting. Follow the kit's instructions, and ask our team if anything is unclear.
Should I stop eating fish before the test?
Yes. Avoid all fish, shellfish, sushi, seaweed and algae products for at least 3 to 7 days before collection, because the test reports total arsenic and seafood can raise it. Tell our team about any seafood you ate in the week before.
Can I take my supplements on the day of the test?
Pause non-essential vitamins, minerals, herbal remedies and over-the-counter medicines for 48 hours before and during collection. Never stop a prescription without your prescriber's advice, and bring your full list to the assessment.
I had an MRI last week. Should I wait?
Yes, if it used contrast dye. Wait at least 96 hours (4 days) after an MRI, CT scan or X-ray with gadolinium, barium or iodine contrast before collecting, and tell our team the date and type of scan.
Related reading
This article is for general education and is not medical advice. Decisions about testing and treatment should be made with your clinician. If you have severe symptoms, call 911. For a suspected poisoning, call Poison Control at 1-800-222-1222.
