Reading Hormonal Markers: LH, FSH, Estradiol
Blood Work · 8 min read · Updated on May 23, 2026
Reading a hormonal panel on cycle means understanding what each marker reflects, and especially what it means in context (before cycle, on cycle, during PCT, post-PCT). An LH of 0.3 IU/L is expected and normal under exogenous testosterone; the same value 8 weeks after the end of PCT is a red flag. Context drives the read, not the isolated value.
This guide goes through the key hormonal markers (LH, FSH, total and free testosterone, estradiol, SHBG, prolactin), their targets, and the classic reading traps. It belongs to the blood work on cycle cluster, and complements the PCT protocol guide for post-cycle reading.
The HPTA: what gets measured, what gets controlled
The hypothalamic-pituitary-testicular axis (HPTA) controls endogenous testosterone production through a feedback loop: the hypothalamus releases GnRH, the pituitary responds with LH (which stimulates testicular Leydig cells) and FSH (which drives spermatogenesis), and the testicles produce testosterone. Testosterone (and the estradiol that comes from aromatizing it) feeds back to the brain and dampens GnRH: that is the feedback loop.
Under exogenous testosterone, the brain reads that the target is hit (and largely overshot), cuts GnRH, so LH and FSH collapse, so testicular production stops and the testicles atrophy [3]. The hormonal panel on cycle reflects exactly that mechanic: LH/FSH floor-bound, total testosterone very high (the exogenous alone), estradiol elevated (aromatization of the exogenous dose) [1].
The key hormonal markers
| Marker | Adult male reference | Role / reading |
|---|---|---|
| Total testosterone | 300–1000 ng/dL (10–35 nmol/L) | Artificially high on cycle; recovery target post-PCT |
| Free testosterone | 5–20 ng/dL | Bioactive fraction; modulated by SHBG |
| SHBG | 10–60 nmol/L | Carrier protein; drops under orals (free artificially raised) |
| LH (luteinizing hormone) | 1.5–9 IU/L | On cycle: crushed. Post-PCT: key recovery indicator |
| FSH (follicle-stimulating) | 1.5–12 IU/L | Drives spermatogenesis; crushed on cycle |
| Estradiol (sensitive E2) | 10–40 pg/mL | Commonly cited target: 20–40 pg/mL on cycle |
| Prolactin | < 15 ng/mL (male) | Request with nandrolone or trenbolone (progestins) |
| DHT | 30–85 ng/dL | Request if hair loss / balding |
The total testosterone trap on cycle
Measuring total testosterone on cycle has limited intrinsic value: the reading will be very high because of the exogenous input, and it tells you nothing about endogenous production (which is shut down anyway). What actually matters on cycle:
- Free testosterone and SHBG — useful for understanding the bioactive fraction, which SHBG modulates. A low SHBG (frequent under orals) raises free testosterone at equal total.
- Estradiol — for the estrogen monitoring, see next section.
- Non-sex markers (CBC, lipid, liver) that reflect the actual impact of the cycle.
Estradiol: the sensitive on-cycle marker
Estradiol (E2) is produced by aromatizing testosterone. Under exogenous testosterone at high dose, that aromatization can push E2 above the physiological range. What this causes: gynecomastia, marked water retention, blood pressure rise. But on the flip side, crashing estradiol with an aromatase inhibitor (anastrozole, exemestane) is worse than letting it run a bit high: dead libido, joint pain, degraded lipids, low mood.
The target: 20 to 40 pg/mL
The commonly cited cycle target is estradiol between 20 and 40 pg/mL. Below 20 pg/mL (crash), adverse effects show up quickly. Above 40 pg/mL, you enter monitoring territory, but bringing in an AI is only justified with clinical signs (nipple sensitivity, rapid water retention) — not to drop a number into range 'because it is high'. The aromatase inhibitors guide details the call.
LH, FSH and reading post-PCT recovery
Four to six weeks after the last SERM dose (Nolvadex or Clomid), the post-PCT panel is the moment of truth. It is what tells you whether the HPTA has restarted.
A typical successful recovery
- LH inside your personal baseline range (typically 2 to 6 IU/L for a non-suppressed adult male).
- FSH inside your personal baseline range.
- Total testosterone back inside your personal range — not just 'within lab range'. Your personal baseline is the reference.
- Estradiol back to a level consistent with the endogenous testosterone (typically 15 to 30 pg/mL).
An incomplete recovery
If at 6 to 8 weeks post-PCT, LH and FSH remain < 1 IU/L and testosterone sits in the bottom quartile of the range (or below), recovery is incomplete [4]. Possible causes are many: bad PCT timing, deeper suppression than expected (long cycles, deca, trenbolone), individual predisposition, or simply a longer recovery delay than average. The right move: stop cycling, see a doctor (ideally trained in post-AAS hypogonadism), and do not chain into a new cycle to 'mask' the trough.
SHBG and prolactin: useful secondary markers
SHBG (Sex Hormone Binding Globulin)
SHBG is the carrier protein that binds testosterone and estradiol and modulates their free (bioactive) fraction. A low SHBG raises the free fraction at equal total testosterone. Under 17α-alkylated orals, SHBG typically drops (Winstrol, Anavar notably) — a sought-after effect on cuts to raise free testosterone. That is also why free testosterone is a better reflection of hormonal activity than total in this context.
Prolactin
Prolactin is specifically worth watching with compounds that carry progestogenic activity — nandrolone and trenbolone — that can drive it up [1]. Elevated prolactin causes libido drop, erectile dysfunction, and favors a 'progestogenic' gyno distinct from estradiol-driven gyno. If values clearly exceed the range with symptoms, cabergoline (by prescription) is the dopamine agonist used to bring it down.
Classic reading traps
- Ignoring your personal baseline. The 'lab range' is a population spread. For someone whose baseline was 750 ng/dL of testosterone, coming back to 350 ng/dL post-PCT is not recovery, it is a half-collapse.
- Mixing units. ng/dL ↔ nmol/L for testosterone (1 ng/dL ≈ 0.0347 nmol/L), pg/mL ↔ pmol/L for estradiol (1 pg/mL ≈ 3.67 pmol/L). A unit error skews interpretation by a factor of 3 to 30.
- Comparing non-equivalent assays. Sensitive estradiol vs immunoassay, calculated free testosterone vs equilibrium dialysis: not directly comparable in absolute terms. Always stay on the same method at the same lab to track a trajectory.
- Drawing at the wrong time. Testosterone has a morning peak: draw in the morning (between 7 and 10 AM) fasted. An afternoon draw underestimates endogenous testosterone.
- Measuring too early in PCT. The post-PCT panel goes 4 to 6 weeks after the last SERM dose, not during PCT. During, the SERM skews the read.
Keeping the history in one consistent format lets you read the trajectory — the essential. AnaProtoKol's blood work feature centralizes lab reports and places each marker on the same curve.
Frequently asked questions
Why is my total testosterone at 1500 ng/dL and flagged 'out of range'?
That is normal and expected under exogenous testosterone. The lab reference range (300–1000 ng/dL in men) reflects endogenous production in an unsupplemented adult male. On cycle, measured total testosterone is mostly from the injection: 1200 to 2500+ ng/dL is common depending on the dose and the timing of the draw relative to injection. This value tells you nothing about endogenous production (shut down by feedback) nor about health per se. The on-cycle warning markers are not total testosterone but hematocrit, estradiol, lipid profile and liver panel.
When do I draw for the post-PCT panel?
The consensus delay is 4 to 6 weeks after the last SERM dose (Nolvadex or Clomid). Earlier, the SERM is still active and skews the read (LH and FSH can be artificially raised by the SERM itself). Later is also an option if you want to confirm a still-uncertain recovery. Draw in the morning (between 7 and 10 AM), fasted, no intense training in the 48 to 72 hours before.
My estradiol is at 55 pg/mL: do I need an AI?
A value at 55 pg/mL is above the commonly cited target (20 to 40 pg/mL on cycle), but bringing in an AI is not justified on the number alone. The decisive criterion is the presence of associated clinical signs (nipple sensitivity or pain, rapid uncomfortable water retention, blood pressure rise). Without clinical signs, many practitioners recommend re-checking the assay (ideally sensitive if the first was not) before introducing an AI. The risk of crashing estradiol by overdosing the AI is underestimated and much more problematic than letting it run a bit high without symptoms. See the aromatase inhibitors guide.
How long for an HPTA to fully recover after a cycle?
With a properly run PCT on a standard testosterone-only cycle, recovery is generally effective at 4 to 8 weeks post-PCT. For longer cycles or cycles including compounds with extended suppression (nandrolone decanoate, trenbolone), the delay can stretch to 8 to 12 weeks or more. Past 12 weeks without measured recovery, a specialist consult is in order. The 'time on = time off' rule applies for the delay before a new cycle, and even that is only a floor until the post-PCT panel has actually confirmed recovery.
Sources
Studies and scientific publications this guide relies on.
- Anawalt BD (2019). Diagnosis and Management of Anabolic Androgenic Steroid Use. Journal of Clinical Endocrinology & Metabolism. doi: 10.1210/jc.2018-01882
Revue clinique : le bilan hormonal des utilisateurs d'AAS doit inclure testostérone totale et libre, LH, FSH, œstradiol, SHBG et prolactine ; sous cure, LH et FSH sont effondrées et la testostérone totale n'est pas interprétable (apport exogène).
- Bhasin S, Brito JP, Cunningham GR, et al. (2018). Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. Journal of Clinical Endocrinology & Metabolism. doi: 10.1210/jc.2018-00229
Guideline 2018 : dosage d'œstradiol par spectrométrie de masse (LC-MS/MS) recommandé chez l'homme ; les immunodosages classiques surestiment l'E2 chez l'homme et peuvent conduire à une prescription d'AI inutile.
- Coviello AD, Matsumoto AM, Bremner WJ, et al. (2005). Low-dose human chorionic gonadotropin maintains intratesticular testosterone in normal men with testosterone-induced gonadotropin suppression. Journal of Clinical Endocrinology & Metabolism. doi: 10.1210/jc.2004-0802
RCT chez 29 hommes : sous testostérone exogène (200 mg/sem), LH et FSH s'effondrent et la testostérone intratesticulaire chute de 57 % vs baseline ; l'ajout de 250 UI de hCG tous les deux jours maintient la testostérone intratesticulaire proche du baseline.
- Rahnema CD, Lipshultz LI, Crosnoe LE, et al. (2014). Anabolic steroid-induced hypogonadism: diagnosis and treatment. Fertility and Sterility. doi: 10.1016/j.fertnstert.2014.02.002
Revue clinique sur l'ASIH : critères biologiques d'une récupération hormonale (LH > 1,5 UI/L, FSH > 1,5 UI/L, testostérone totale > 300 ng/dL) à 4-6 semaines post-PCT, et conduite à tenir en cas de récupération incomplète.
- Pope HG Jr, Wood RI, Rogol A, et al. (2014). Adverse health consequences of performance-enhancing drugs: an Endocrine Society scientific statement. Endocrine Reviews. doi: 10.1210/er.2013-1058
Énoncé scientifique : l'utilisation prolongée d'AAS supprime systématiquement l'axe HPT (LH et FSH au plancher) et peut induire une dysrégulation hormonale persistante après l'arrêt, avec hypogonadisme prolongé chez certains sujets.
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