How to read a testosterone blood test
What the test measures, why timing matters, and why one low value does not establish a diagnosis.
Read the blood-test guideMen’s hormone health
Our articles start with testosterone: understanding blood tests, comparing results, and preparing for a conversation about treatment.
Thinking about treatment
Thinking about testosterone treatment? Start with these questions.
How was the diagnosis confirmed? Could treatment affect fertility? What will follow-up involve? Bring these questions to the conversation before a prescription.
Read the treatment questionsTests and results
Total vs. free testosterone: what is the difference?
Understand the two measurements, binding proteins, and when an additional test may help. The image is a conceptual metaphor, not proportions.
Read the comparisonPrint and bring
Your testosterone appointment checklist
Put your questions, lab reports and agreed next steps in one place. Print the checklist and make notes on paper.
Open the printable checklistMy main question for this visit
What happens next, and who arranges it?
Quick answers about testing and treatment
Start with a short answer, then follow the link for the explanation and its sources.
Does one low result confirm a diagnosis?
No. In adults being evaluated for male hypogonadism, a clinician considers symptoms and confirms low testosterone with repeat, accurate tests. Read the full answer.
Can I have coffee before a fasting blood test?
If you were told to fast, drink plain water only. Confirm your preparation instructions with the ordering clinician. Read the full answer.
Should I mention plans for children?
Yes, before treatment. Testosterone medication can suppress sperm production. Discuss current or future fertility plans before a prescription. Read the full answer.
About Hormone Desk
Hormone Desk is an educational publication about men’s hormone health. Current articles focus on adults researching possible testosterone deficiency. It does not interpret personal results or prescribe treatment.
Prepared with AI assistance; not independently reviewed by a clinician. How the articles are prepared. Sources checked September 12, 2026. Page updated .