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Free Testosterone Calculator: Estimate Your Free T Using the Vermeulen Equation

Free Testosterone Calculator: Vermeulen Equation | HealthMatters This calculator estimates free testosterone in adult men using the Vermeulen–Södergård mass-action binding equation — a method many endocrinologists consider more reliable than the direct analog immunoassay, particularly when SHBG is abnormal. Enter your total testosterone (ng/dL), SHBG (nmol/L), and albumin (g/dL) to get your estimated free T […]

By HealthMatters.io 12 min read Updated May 11, 2026

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Reviewed by clinicians, written for humans.

Biomarkers · 12 min read

Free Testosterone Calculator: Estimate Your Free T Using the Vermeulen Equation

HealthMatters.io · May 11

Biomarkers · 11 min read

You Got a Positive ANA. Now What? A Practical Guide for the Newly Diagnosed

Most people with a positive ANA — especially at low titers — do not end up being diagnosed with lupus or any autoimmune disease.…

HealthMatters.io · May 10

Biomarkers · 6 min read

I Got an Abnormal NT-proBNP Result. Here’s What to Do Next.

You opened your lab report and something flagged. Here's how to think through it — without panicking.

HealthMatters.io · May 9

Practionier Tools · 5 min read

Practitioners Are Quietly Ditching Spreadsheets for Lab Results — Here’s Why

If you work with clients on their lab results, you know the routine. A PDF arrives — sometimes from LabCorp, sometimes Quest, sometimes a…

HealthMatters.io · May 1

Biomarkers · 4 min read

High Triglycerides: Causes, Risks, and How to Lower Them

Triglycerides are a key marker on a cholesterol test and an important indicator of metabolic and cardiovascular health. If your triglyceride levels are elevated,…

HealthMatters.io · Feb 7

Biomarkers · 4 min read

Optimal LDL Cholesterol Levels by Age and Risk

LDL cholesterol is one of the most closely watched markers on a cholesterol test. While many lab reports provide a single reference range, the…

HealthMatters.io · Feb 7

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Free Testosterone Calculator: Estimate Your Free T Using the Vermeulen Equation

Latest articles

Free Testosterone Calculator: Estimate Your Free T Using the Vermeulen Equation

You Got a Positive ANA. Now What? A Practical Guide for the Newly Diagnosed

I Got an Abnormal NT-proBNP Result. Here’s What to Do Next.

Practitioners Are Quietly Ditching Spreadsheets for Lab Results — Here’s Why

High Triglycerides: Causes, Risks, and How to Lower Them

Optimal LDL Cholesterol Levels by Age and Risk

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Free Testosterone Calculator: Estimate Your Free T Using the Vermeulen Equation

Free Testosterone Calculator: Estimate Your Free T Using the Vermeulen Equation

You Got a Positive ANA. Now What? A Practical Guide for the Newly Diagnosed

I Got an Abnormal NT-proBNP Result. Here’s What to Do Next.

Practitioners Are Quietly Ditching Spreadsheets for Lab Results — Here’s Why

High Triglycerides: Causes, Risks, and How to Lower Them

Optimal LDL Cholesterol Levels by Age and Risk

Biomarkers

Nutrition

Recipes

Tests

Inspiration

Fitness

Practionier Tools

iron

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