Getting your testosterone tested is straightforward, but doing it correctly matters. Testing at the wrong time of day, skipping key markers, or using unreliable methods can produce results that are misleading enough to either miss a real problem or create a false one.
This guide covers exactly how to prepare, what tests to order, where to get them done, and what to expect from the process and cost.
Preparation: Before Your Blood Draw
Testosterone testing is not a walk-in-anytime blood draw. Several factors affect accuracy.
Timing: Early Morning Is Non-Negotiable
Testosterone follows a circadian rhythm, peaking between 6-8 AM and reaching its nadir in the late afternoon/evening. In younger men, the difference between morning and afternoon levels can be 20-35%. Even in men over 60 (where the diurnal variation is blunted), morning levels are still meaningfully higher.
The Endocrine Society guidelines specify testing between 7-11 AM. An afternoon draw risks producing a falsely low result that could lead to unnecessary treatment, or conversely, a "low-normal" result when the true morning level would have been clearly low.
Practical tip: Schedule the earliest available lab appointment. If you cannot get a morning slot, 10-11 AM is acceptable but not ideal.
Fasting: 8-12 Hours
Eating, particularly carbohydrate-rich meals, acutely suppresses testosterone. One study showed a 25% decline in total testosterone following a glucose load. Fasting for 8-12 hours before your draw eliminates this variable.
Water, black coffee (unsweetened), and prescribed medications are fine. Skip breakfast.
What to Avoid Before Testing
Intense exercise within 24 hours. Heavy resistance training causes an acute testosterone spike followed by suppression. Testing within 24 hours captures the rebound suppression, not your baseline.
Alcohol within 48 hours. Alcohol acutely suppresses testosterone and disrupts the HPG axis. Even moderate drinking the night before can meaningfully lower your result.
Poor sleep. One night of significantly restricted sleep (4-5 hours) can lower testosterone by 10-15%. If you had a particularly bad night, consider rescheduling.
Acute illness or severe stress. Being sick or under extreme psychological stress suppresses the HPG axis temporarily. Test when you are in your normal health state.
What Not to Worry About
Sexual activity: Does not meaningfully affect morning testosterone levels
Supplements: Routine supplements (vitamin D, zinc, magnesium) do not need to be stopped
Normal daily stress: Ordinary work/life stress is part of your baseline
What to Order: The Comprehensive Hormone Panel
The Essential Panel (Minimum)
These six markers are the bare minimum for evaluating testosterone status:
Test
Why It Matters
Total Testosterone
Primary screening marker; request LC-MS/MS assay if possible
Free Testosterone
The biologically active fraction; calculated from total T + SHBG is preferred
SHBG
Required to interpret the relationship between total and free T
LH (Luteinizing Hormone)
Distinguishes primary (testicular) from secondary (pituitary) hypogonadism
FSH (Follicle-Stimulating Hormone)
Supports LH in diagnosing the cause; also reflects Sertoli cell function
Estradiol (Sensitive)
Assesses testosterone-to-estrogen balance; request the sensitive/LC-MS/MS assay
With these six values, a clinician can determine whether testosterone is low, whether the problem is in the testes or the brain, and whether estrogen conversion is a factor.
The Comprehensive Panel (Recommended)
For a complete hormonal and metabolic picture, add these:
Test
Why It Matters
CBC (Complete Blood Count)
Baseline hematocrit/hemoglobin (TRT raises these; need a starting point)
CMP (Comprehensive Metabolic Panel)
Liver and kidney function, electrolytes, glucose
Lipid Panel
Cardiovascular risk baseline
Prolactin
Elevated prolactin suppresses GnRH; can indicate pituitary adenoma
TSH + Free T4
Thyroid dysfunction mimics many low T symptoms
Fasting Insulin
Assesses insulin resistance, which drives SHBG down and worsens hormonal picture
This comprehensive panel costs more but prevents missing conditions that mimic low testosterone (hypothyroidism, diabetes, hyperprolactinemia) and establishes baselines that are essential if you start treatment.
Understanding LH and FSH Results
LH and FSH are critical for determining the cause of low testosterone:
Low T + Low/Normal LH + Low/Normal FSH = Secondary hypogonadism (the brain is not signaling the testes properly). Causes: pituitary tumors, medications, obesity, chronic illness.
Low T + High LH + High FSH = Primary hypogonadism (the testes are not responding despite adequate signaling). Causes: testicular damage, Klinefelter syndrome, aging, varicocele.
Low T + Very High LH = The pituitary is screaming for more testosterone but the testes cannot deliver.
This distinction matters because treatment approaches differ. Secondary hypogonadism may respond to enclomiphene or clomiphene (which stimulate LH), while primary hypogonadism typically requires direct testosterone replacement.
The traditional route: your doctor orders the labs, you go to a local draw station (Quest, LabCorp, hospital lab), insurance covers most or all of the cost.
Pros: Insurance coverage, physician interpretation, medical record integration
Cons: Some doctors only order total testosterone (missing free T, SHBG, LH), may need to specifically request the comprehensive panel, appointment wait times
Tip: If your doctor is unfamiliar with hormone panels, print the comprehensive panel list above and bring it to your appointment. Most doctors will order what you ask for.
Direct-to-Consumer Lab Services
Several services let you order your own labs without a doctor's visit:
Quest Diagnostics / LabCorp (self-pay): Order directly through their websites. Basic hormone panels $100-200.
Discounted Labs / Walk-In Lab: Third-party ordering services that use Quest/LabCorp facilities at reduced prices. Comprehensive male hormone panels $120-180.
Online TRT clinic intake panels: Many TRT clinics offer lab panels as part of their onboarding. Typically $99-199 bundled with a consultation.
Pros: No doctor visit needed, faster turnaround, often comprehensive panels by default
Cons: Not covered by insurance, results require self-interpretation or separate clinician review
Online TRT Clinics
Many online TRT clinics include lab work as part of their intake process. They send you to a local Quest/LabCorp, order the labs, and review results with you. The lab cost is typically bundled into the consultation fee or offered at a discount.
Maximus takes this a step further with CLIA-certified at-home lab kits included in their $99.99/month subscription — no trip to a draw site required. The convenience factor is significant for men who want to skip the scheduling and commute to Quest or LabCorp.
This is efficient if you are already considering treatment but want confirmation first. For a guide on choosing a clinic, see how to choose a TRT clinic.
Cost Comparison
Route
Approximate Cost
What You Get
Insurance (with doctor order)
$0-50 copay
Depends on what doctor orders
Quest/LabCorp self-pay (basic)
$75-150
Total T, free T, basic metabolic
Discounted Labs (comprehensive)
$120-180
Full hormone panel + metabolic markers
Walk-In Lab (comprehensive)
$150-250
Comprehensive panel + optional clinician review
Online TRT clinic intake
$99-199
Labs + consultation (often bundled)
At-home finger-prick kit
$50-100
Total T only (limited accuracy)
For most men, the direct-to-consumer route through Discounted Labs or similar services offers the best combination of comprehensiveness and value. If you have insurance with good lab coverage, going through your doctor is cheapest but requires ensuring the right tests are ordered.
Interpreting Your Results
When your results come back, here is the framework for initial interpretation:
Step 1: Check Total Testosterone
Below 264 ng/dL: Clearly low by Endocrine Society criteria. Warrants repeat testing and clinical evaluation.
264-350 ng/dL: Low by most clinical standards. Symptoms likely. Further workup indicated.
350-500 ng/dL: "Low-normal" range. Symptoms possible, especially if free T is also low. Context dependent.
500-800 ng/dL: Mid to upper range. If symptomatic, look at free T and SHBG.
Above 800 ng/dL: Upper range. Symptoms of low T unlikely to be testosterone-driven.
Step 2: Check Free Testosterone
Below 5 ng/dL: Low by most standards. Consistent with functional hypogonadism regardless of total T.
5-9 ng/dL: Gray zone. Symptom correlation is important. Many men are symptomatic in this range.
Above 9-10 ng/dL: Generally adequate. If symptomatic, investigate other causes.
Step 3: Evaluate SHBG
Below 20 nmol/L: Low. Usually indicates insulin resistance/obesity. Free T may be inflated relative to total T.
20-50 nmol/L: Normal range.
Above 50 nmol/L: Elevated. Free T may be low despite normal total T. Investigate cause.
Step 4: Assess LH/FSH
Determine whether the issue is central (pituitary) or peripheral (testicular). This guides treatment decisions.
The Endocrine Society requires two confirmed low morning draws before diagnosing hypogonadism. Schedule the second draw 2-4 weeks after the first, under the same conditions (same time, fasting, adequate sleep).
If the first test is borderline (300-400 ng/dL), the second test is especially important because day-to-day variation could place you above or below any threshold.
On TRT
Once on treatment, testing cadence is:
6-8 weeks after starting or adjusting dose (testosterone has reached steady state by this point)
Every 3-6 months once stable on a dose
Annually for comprehensive panels including PSA, lipids, and metabolic markers
Trough testing (draw blood the morning before your next injection) to assess your lowest levels
This content is for informational purposes only and is not medical advice. Consult a qualified healthcare provider before starting any treatment.
Frequently Asked Questions
When should I get my testosterone tested?
Test between 7-11 AM when testosterone levels are naturally highest. Avoid testing when acutely ill, severely stressed, or sleep-deprived, as these temporarily lower testosterone. Fasting is recommended to avoid glucose-induced testosterone suppression.
What testosterone tests should I request?
At minimum: total testosterone (LC-MS/MS), free testosterone (calculated or equilibrium dialysis), SHBG, LH, FSH, and estradiol (sensitive). A comprehensive panel adds CBC, CMP, prolactin, thyroid (TSH + free T4), lipid panel, and fasting glucose/insulin.
Do I need to fast before a testosterone test?
Yes, fasting for 8-12 hours is recommended. Studies show that eating, particularly high-carb meals, can acutely lower testosterone by 15-25%. Fasting produces the most accurate and reproducible results. Water is fine.
How much does testosterone testing cost?
Through insurance with a doctor's order, typically $0-50 copay. Direct-to-consumer labs like Quest or LabCorp self-pay panels range from $75-250 depending on comprehensiveness. Online lab ordering services (Discounted Labs, Walk-In Lab) offer hormone panels for $100-200.
Can I test at home?
At-home finger-prick kits (e.g., Everlywell) exist but have significant accuracy limitations. They use smaller blood volumes and immunoassay methods that are less reliable than venous blood draws analyzed by LC-MS/MS. For initial screening they may catch very low levels, but for clinical decision-making, a standard venous draw is strongly recommended.
How often should I retest?
For initial diagnosis: at least two morning draws, typically 2-4 weeks apart. On TRT: 6-8 weeks after starting or adjusting dose, then every 3-6 months once stable. Annual comprehensive panels are recommended for ongoing monitoring.
Why do I need two tests to be diagnosed?
Testosterone fluctuates day to day by 10-20% due to sleep quality, stress, illness, and normal biological variation. A single low reading might not reflect your true baseline. The Endocrine Society requires two confirmed low morning draws to diagnose hypogonadism, reducing the risk of false diagnosis.
What should I avoid before testing?
Avoid intense exercise within 24 hours (acute testosterone spike then suppression), alcohol within 48 hours, very poor sleep the night before, and eating the morning of the test. Continue all regular medications unless your doctor advises otherwise.
