Selenium At-Home and Finger-Prick Testing Options
Everything you need to know about selenium at-home test kits, finger-prick collection, normal reference ranges, optimal levels for thyroid and antioxidant function, and how to interpret your results.
Selenium (Lab Test)
16 source-based articles maintained by the HealthRX.com Editorial Team.
16articles
3topic areas covered
Jul 14, 2025latest review
Selenium (Lab Test) library
Showing 16 of 16 clinical reviews.
Selenium Blood Test: What It Actually Measures and Why It Matters
A clinical guide to the serum selenium test, including what it measures, normal reference ranges, causes of high and low levels, and how selenium status affects thyroid function and antioxidant defense.
Selenium Interpretation by Decade of Life
A decade-by-decade guide to selenium lab values, deficiency risk, and clinical context for thyroid health and antioxidant defense, with an evidence-boundary map showing what is established versus unverified.
Selenium Lab Results: Normal Reference Range vs. Functional Optimal
Standard selenium ranges span 70-150 ng/mL, but functional targets for thyroid and antioxidant optimization are narrower. Learn what your selenium level means and how to act on it.
Selenium Longevity-Medicine Target Ranges: What Labs Actually Show
Evidence-based selenium reference ranges for longevity medicine, thyroid conversion, antioxidant enzyme function, and cardiovascular health. Includes optimal targets, deficiency cutoffs, toxicity thresholds, and how to interpret your serum and plasma results.
Selenium Medication-Driven Changes: How Drugs and Supplements Shift Your Levels
A guide to how medications, supplements, and hormonal therapies change selenium status, what the optimal range looks like, and how to interpret your lab results in clinical context.
Selenium Nutrition and Fasting Impact: Normal Range, Optimal Levels, and Clinical Guidance
How diet, fasting, and supplementation affect serum selenium levels. Includes normal range, optimal targets, thyroid conversion effects, antioxidant function, and evidence-based clinical guidance.
Selenium Rate-of-Change Interpretation: How to Read Falling, Stable, or Rising Levels
A guide to selenium lab interpretation, normal and optimal ranges, rate-of-change thresholds, and what trends mean for thyroid conversion, antioxidant defense, and longevity protocols.
Selenium Sex- and Cycle-Related Differences: Normal Range, Optimal Levels, and What Changes Your Results
Selenium levels differ by sex, menstrual cycle phase, and hormonal status. Learn the normal range, optimal targets, and why your result may shift with estrogen, pregnancy, or thyroid disease.
Selenium, Training, and Exercise: What Athletes and Active Adults Need to Know
How exercise changes selenium requirements, what optimal selenium levels look like, and how to interpret your selenium lab result if you train regularly.
Selenium: Drugs That Distort This Test
Which medications raise, lower, or interfere with serum selenium results? A clinical guide to drug-selenium interactions, timing adjustments, and accurate interpretation.
Selenium: Evidence-Based Ways to Improve This Number
How to raise or lower your selenium level with dietary changes, supplementation, and clinical monitoring. Includes normal ranges, food sources, and dosing backed by peer-reviewed research.
Selenium: How to Interpret Your Result
Learn how to read your selenium blood test, what normal ranges mean, and what high or low levels signal for thyroid function, antioxidant defense, and overall health.
Selenium: What Your Number Changes About Your Treatment
Your serum selenium level directly shapes thyroid medication dosing, antioxidant status, and supplementation decisions. Here is what each range means for your care plan.
Selenium: When to Order This Test
Learn when clinicians order a serum selenium test, what normal ranges mean, and how to interpret high or low results in the context of thyroid function, antioxidant status, and chronic disease.
Selenium: Which Tests to Order Alongside a Selenium Level
A guide to interpreting serum selenium results and the companion lab panel every provider should order: thyroid function, glutathione peroxidase, iodine, and more.