One of the most common recovery questions is "How long after my last injection should I get blood work?" The answer is ester-specific arithmetic. This article covers the timeline per compound, why your natural testosterone does not reappear on schedule, and which numbers at which weeks tell you whether recovery is actually happening.
Let's run the numbers for a standard 500 mg/week cypionate cycle. Peak total T typically lands around 1500-2000 ng/dL 24-48 hours after the last injection. With a 4.5-day half-life, that drops to roughly 900-1200 by day 7, 500-700 by day 14, and 300-400 by day 21. That means at week 3 you are still above the 300 ng/dL threshold that keeps your HPTA suppressed. Drawing at week 2 or 3 will show a total T that looks like a mild cycle, not recovery. The only useful information from that draw is confirming the ester is clearing. Wait until week 4 for the first meaningful read.
Ester Half-Lives: The Arithmetic of Coming Off
Every ester has a half-life, the time it takes for the injected depot to release half its contents. After your last injection, exogenous testosterone drops by roughly half with each half-life that passes. The practical consequence: your last shot keeps suppressing your HPTA until levels fall below roughly 300-400 ng/dL, and only below that does your own LH/FSH production get the signal to restart.
The half-life math is exponential, not linear. Each half-life removes half of what remains, so the drop is steep early and flattens out. For enanthate, half-life is 4.5 days, so after 7 days you have about 40% left, after 14 days about 16%, after 21 days about 6%. That residual 6% of a 2000 ng/dL peak is still 120 ng/dL, which is below the suppression threshold but still detectable. The practical point: you cannot speed up clearance. No amount of water, liver support, or cardio changes the ester's release rate. Only time and the ester's specific half-life matter. This is why PCT timing is tied to the ester, not to how you feel.
Time From Last Injection to Exogenous T Below ~300 ng/dL
| Marker | Compound | Typical Timeline |
|---|---|---|
| Testosterone propionate (100mg EOD) | ~5-7 days | Short ester, fast drop |
| Testosterone cypionate/enanthate (500mg/wk) | ~3-4 weeks | The standard cycle ester |
| Testosterone enanthate (250mg/wk) | ~2-3 weeks | Lower dose = faster to threshold |
| Sustanon 250 (single shot) | ~2 weeks | Mixed esters, dominated by long ones |
| Nandrolone decanoate (400mg/wk) | ~6-8 weeks | Deca outlasts your PCT by a mile |
| Boldenone EQ (600mg/wk) | ~5-7 weeks | Undecylenate is slow |
The Deca Trap
What Happens Week by Week
Week 0-2 Post-Injection: The Hormone Falls
Exogenous testosterone falls through this window, but it still sits above physiological range for most of it. LH and FSH stay suppressed. What that blood work is really telling you is how the ester is clearing, not how your own axis is recovering. There's nothing clinical to act on yet.
At week 2-3 post injection, your total T might still read 600-900 ng/dL, which is within normal range for a healthy man. Do not mistake that for natural recovery. Your LH and FSH are still near zero because the exogenous hormone is still above the threshold that suppresses the pituitary. A blood draw in this window that shows total T in the 500s with LH below 1 is exactly what you expect. It tells you nothing about your axis. The only reason to draw this early is to confirm the ester is clearing or to check for other issues like hematocrit or estradiol. For recovery assessment, it is a wasted draw.
Week 3-5: The Signal Returns
Once exogenous levels drop below ~300 ng/dL, LH and FSH start to climb if your HPTA is still responsive. A draw at week 4-5 showing FSH above 3 mIU/mL is an encouraging early sign. Total T may still read low (200-400) because your axis is just waking up. That's normal, not hypogonadism.
When LH and FSH start to rise, they do so slowly. At week 4-5, an FSH of 2-3 mIU/mL is a good sign, but total T may still be 200-300 because the Leydig cells are just waking up. Do not panic if total T is low while LH is climbing. That lag is normal. The pituitary releases LH, but it takes days to weeks for the testes to ramp up testosterone production. A common mistake is to interpret a low total T at week 5 as permanent damage. The correct read is to look at the trend: if LH is rising and total T is stable or slightly up, you are on track. If LH is flat and total T is dropping, that is a different story.
Week 6-10: The Real Readout
This is where meaningful recovery blood work lives. LH 3-8 mIU/mL, FSH 3-10, testicular T production ramping. Total T above 400 ng/dL at week 8-10 with rising LH is a genuinely recovering axis. Sperm production lags months behind, so fertility recovery is a 6-12 month metric, not a 6-week one.
At week 8-10, you want to see total T above 400 ng/dL with LH in the 3-8 range. But also check free T. SHBG often rises after a cycle, which can keep total T normal while free T stays low. If total T is 500 but free T is below reference, you may still feel symptoms. Also, estradiol matters. Aromatase activity recovers along with testosterone, and a spike in estradiol can suppress LH via negative feedback. If your total T is climbing but LH is stuck, check estradiol. High E2 can blunt the recovery signal. In that case, managing E2 with an AI or SERM may be necessary, but only under medical guidance.
Week 12-16: The Honest Baseline
When total T is still below 350 ng/dL at week 12-14 with LH under 2, that's delayed recovery, not "still clearing." This is the point where discussing intervention with a licensed medical professional becomes reasonable rather than premature. Some axes genuinely take 6-12 months to bounce back. Most healthy axes don't.
Delayed recovery is not a single event. If at week 12-14 your total T is still below 350 with LH under 2, the first step is to repeat the draw in 4 weeks to confirm the trend. One low draw can be a fluke from poor sleep, stress, or a recent illness. If the second draw confirms, then look at the usual culprits: age over 35, multiple prior cycles, use of nandrolone or other 19-nors, and pre-existing subclinical hypogonadism. A trial of a SERM like clomiphene is a common medical approach at this point, but the choice of drug, dose, and duration is a licensed medical professional's call, not something to self-prescribe. The goal is to restart the axis, not to blast it. Most men recover by month 6, but some take a year.
LH (Luteinizing Hormone)
FSH (Follicle Stimulating Hormone)
The Blood Work Schedule That Makes Sense
📅Three draws answer the recovery question. One too early tells you nothing and costs money. Here is the schedule that separates "still clearing" from "not recovering."
— GearCheck Protocol
Draw 1 at ester-clearance week (3-4 weeks post last injection for cyp/enanthate at cycle doses; 6-8 for deca/EQ) gives you a full hormone panel. Expect low T and low-ish LH/FSH, and this draw establishes the starting line. Draw 2 at week 8-10 is the recovery readout: LH/FSH rising, T climbing toward 400+. If LH is still below 1 here, flag it. Draw 3 at week 14-16 is the honest verdict. T above 450-500 with normal LH/FSH means recovery happened. Below 350 with flat LH means the conversation with a licensed medical professional about intervention is now evidence-based, not anxious.
Consistency in blood work matters more than the exact week. Always draw fasted, in the morning, and at the same time of day. Total T has a circadian rhythm, and a 2 PM draw can read 20-30% lower than an 8 AM draw. Also, avoid drawing within 48 hours of a heavy leg workout or a night of poor sleep, both of which can suppress testosterone. For the recovery readout, compare your week 8-10 numbers to your week 3-4 baseline, not to a reference range. A rise from 200 to 400 is more meaningful than a single 400 reading. Track LH, FSH, total T, free T, and estradiol together. That gives you the full picture.
The PCT-Timing Interaction
If you are on a SERM during PCT, your LH and FSH will be artificially elevated. Clomiphene at 50 mg daily can push LH to 10-15, which looks like a strong recovery. But that is a drug effect, not your axis working on its own. To get a true read, you need to stop the SERM and wait 4-5 half-lives. Clomiphene has a half-life of 5-7 days, so 4 weeks after the last dose is the earliest honest draw. Even then, the pituitary may still be adjusting. If you are using enclomiphene, the half-life is similar. The takeaway: never judge natural recovery while on a SERM. The numbers will lie to you.