Getting an Accurate Testosterone Test
If you're experiencing symptoms like low energy, low libido, or trouble building muscle, a testosterone test is a simple first step. But how and when you test can make a big difference in your results.
What Time of Day Should You Test?
Testosterone follows a daily rhythm—it's highest in the early morning and lower in the afternoon and evening. That's why guidelines recommend testing between about 7 and 10 a.m.
Testing later in the day can make your levels look lower than they really are, especially in younger men.
Why You May Need Two Tests
Testosterone levels can vary from day to day. Because of this, a low result should be confirmed with a second morning test on a different day before any diagnosis or treatment.
What Labs Should Be Checked?
A thorough evaluation often includes:
- Total testosterone: The main screening test
- Free testosterone: The portion available for your body to use
- SHBG: A protein that binds testosterone and affects how much is free
- LH and FSH: Pituitary hormones that help identify the cause of low testosterone
- Estradiol: The main form of estrogen, which matters for men too
- Complete blood count (CBC): To check hematocrit before and during treatment
- PSA: A prostate marker, often checked before starting treatment in men over 40
- Prolactin: Sometimes checked if testosterone and LH are both low
How to Prepare for Your Test
- Schedule your blood draw in the early morning
- Get a normal night of sleep beforehand
- Avoid heavy drinking the night before
- Follow any fasting instructions from your provider (some evidence suggests eating, especially sugar, can temporarily lower testosterone)
- Avoid testing during an acute illness
- Tell your provider about medications and supplements you take
Testing Through Heva
Comprehensive lab testing can give you a clear starting point and help a provider decide whether treatment makes sense—or whether something else is causing your symptoms.
Learn more about lab testing here: Heva Lab Testing
The Bottom Line
For accurate results, test testosterone in the early morning, confirm low results with a second test, and check related markers like free testosterone and SHBG. That gives you and your provider the full picture.