Medical reviewer
Youmna DiStefano, MD
Dr. DiStefano is a board-certified anesthesiologist and Florida-licensed physician (license ME132254), in clinical practice since 2017, who reviews TestWell's health content for clinical accuracy. She has signed off 549 pages, most recently on October 7, 2026. She does not authorize orders; a separate licensed physician does.
What are her credentials, and where can you verify them?
Every credential below links to the public primary source it comes from. Two limits are deliberate: her board certification is in anesthesiology only — pain medicine is fellowship training, not a certificate — and neither is a laboratory-medicine credential, so clinical claims on reviewed pages are checked against cited primary sources rather than resting on her specialty.
| Credential | Detail | Verify |
|---|---|---|
| Medical license | Florida Department of Health, ME132254, status clear/active, originally issued 2017 | Florida license lookup |
| Board certification | American Board of Anesthesiology — Anesthesiology, certified October 11, 2024, valid through December 31, 2029, participating in MOCA | ABA diplomate directory |
| NPI | 1851687750 (individual, active) | CMS NPPES registry |
| Fellowship training | Pain medicine (training, not a board certificate) | Diploma on file with TestWell |
| Languages | English, Spanish — she reviews the Spanish mirror (translation and clinical content) herself | /es |
What does the medical reviewer actually check?
Three things on every page she signs: that reference ranges match the cited source and are framed as typical adult values (your report's ranges govern); that the page is honest about who a test is and is not appropriate for, including who can skip it; and that result interpretation stays educational — no dosing, no diagnosis. Prices, turnaround times, sample types and CPT codes are generated from the live catalog and are outside the clinical review; they are checked separately against the labs' data.
Which pages has she reviewed?
549 pages across 7 content families carry her byline. The counts below come from the same review-date fields that render each byline, so a page is counted here only if it displays her name and review date itself.
| Content family | What is reviewed | Pages | Most recent review |
|---|---|---|---|
| Test and panel pages | Reference ranges, who the test is for, and how results are read | 237 | October 5, 2026 |
| “Is it worth it?” guides | Decision guidance on each test page, including who can skip it | 30 | August 6, 2026 |
| Biomarker reference pages | Reference bands, high/low context and citations for every marker | 132 | September 5, 2026 |
| Health and testing guides | Long-form guides on when and how to test | 65 | October 7, 2026 |
| Symptom guides | Which tests help explain a symptom, and which do not | 35 | September 6, 2026 |
| Before-your-test guides | Fasting, supplements, medications and timing effects on results | 32 | October 7, 2026 |
| Condition pages | Screening and monitoring panels by condition | 18 | September 14, 2026 |
Most recently reviewed
- Can you take antibiotics before a blood test — and which results do they change? · October 7, 2026
- Do antihistamines affect allergy blood test results? · October 7, 2026
- Do Ozempic, Wegovy, Mounjaro and Zepbound affect blood test results? · October 7, 2026
- Do you need to fast before a blood test — and which tests does eating affect? · October 7, 2026
- Does marijuana show up on a blood test — and how long does THC stay detectable? · October 7, 2026
- Does metformin affect blood test results — and should you take it before a blood test? · October 7, 2026
- Does prednisone affect blood test results? · October 7, 2026
- How Much Does a Cortisol Test Cost? Blood, Saliva and Urine Cortisol Prices by Setting, With and Without Insurance — and Which Test You Actually Need · October 7, 2026
How is her review independent of what TestWell sells?
Dr. DiStefano is compensated by TestWell for content review and has no role in pricing, catalog selection or order authorization. Her sign-off is per page and dated; TestWell cannot add the byline to a page she has not reviewed, because the byline renders only from a recorded review date. If she declines a claim, the claim is removed or the page ships without the byline. Corrections go to support@test-well.com and are prioritized ahead of new content.
Frequently asked questions
Is Dr. DiStefano the physician who approves my lab order?
No. Dr. DiStefano reviews TestWell's educational content — reference ranges, who a test is and is not appropriate for, and how results should be interpreted. Every order is reviewed and authorized separately by a licensed physician in your state before a lab requisition is issued.
How can I verify her credentials?
Three public primary sources: her Florida medical license (ME132254) in the Florida Department of Health license lookup, her American Board of Anesthesiology certification in the ABA diplomate directory, and her NPI (1851687750) in the CMS NPPES registry. All three are linked on this page.
Is she board certified in laboratory medicine?
No. Her board certification is in anesthesiology, and her fellowship training is in pain medicine. TestWell's reference ranges and clinical claims are checked against primary sources — clinical guidelines, peer-reviewed literature and the reference laboratories' own documentation — which are cited on each reviewed page.
How often is reviewed content re-checked?
Each reviewed page shows its most recent review date. Prices, turnaround times and CPT codes are generated from the live catalog at render time, so they are not part of the clinical review cycle; clinical content is re-reviewed when guidelines or reference ranges change and at least annually.