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 |
| HbA1c |
Screens for diabetes/prediabetes |
| DHEA-S |
Adrenal androgen marker; low DHEA-S suggests adrenal insufficiency |
| PSA (if over 40) |
Prostate baseline before any testosterone therapy |
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.
Where to Get Tested
Through Your Doctor
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.
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.
For a detailed interpretation guide, see how to read testosterone labs. For understanding total vs free testosterone in depth, see our dedicated article.
When to Retest
For Initial Diagnosis
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
For injection frequency considerations and how timing affects trough levels, see our dosing guide.
Monitoring on TRT: What to Watch
| Marker |
Target on TRT |
Red Flag |
| Total Testosterone (trough) |
500-800 ng/dL |
Above 1100 or below 400 |
| Free Testosterone |
Upper third of range |
Above range or below range |
| Hematocrit |
Below 54% |
Above 54% (polycythemia risk) |
| Estradiol |
20-40 pg/mL |
Above 50+ (potential aromatization issue) |
| PSA |
Stable or slight increase |
Rapid rise (>1.4 ng/mL per year) |
Key Takeaways
- Test between 7-11 AM, fasting, after adequate sleep for accurate results
- Order the comprehensive panel: total T, free T, SHBG, LH, FSH, estradiol (sensitive) at minimum
- Two confirmed morning draws are required for diagnosis
- Direct-to-consumer labs offer comprehensive panels at $120-200 without a doctor visit
- Interpreting results requires looking at multiple markers together, not just total T
- Retest every 3-6 months on TRT, always at trough timing
Related Reading
This content is for informational purposes only and is not medical advice. Consult a qualified healthcare provider before starting any treatment.