Across the blood work GearCheck sees from AAS users — real athletes who train hard and cycle with varying degrees of care — the same handful of patterns show up again and again, from textbook-clean panels to genuine red flags.
This isn't a clinical study; it's an observational pattern from a self-selected population, and the figures below are illustrative of that pattern rather than a precise, audited statistic. But the direction is consistent enough to be worth paying attention to: these patterns describe what's "expected for AAS use" versus what's genuinely pathological.
Low 20s-30s
Typical HDL on Blast (mg/dL)
Oral compound users tend to run even lower, often well below the athletic minimum of 35 mg/dL.
The HDL crash is driven by hepatic lipase activation and increased reverse cholesterol transport. Orals like anavar and winstrol are particularly harsh because they bypass first-pass metabolism and hit the liver directly, and HDL tends to drop within the first couple weeks of starting one. It also tends to recover reasonably quickly after discontinuation. A markedly low HDL mid-cycle — especially on an oral — is worth bringing to whoever manages your protocol; compound choice is one of the levers that conversation can cover. Omega-3 intake and soluble fiber are commonly discussed as supportive habits, but they don't offset the drop on their own — time off the compound and a clean diet do most of the work.
Around 50%
Typical Hematocrit on Blast
Boldenone and oxandrolone users tend to trend toward the higher end of this range.
A hematocrit around or just above 50% is common on a blast. The mechanism is erythropoietin stimulation from androgens, which increases red cell mass — boldenone and oxandrolone are notorious for this because of their longer half-life and more sustained EPO effect. But the number alone isn't the full risk picture: it becomes a real concern specifically alongside an elevated platelet count and reduced activity, or via the blood-pressure route. A hematocrit creeping upward responds well to more hydration and, if it keeps climbing past the low 50s, a blood donation (checking ferritin first) — both safe steps to take directly. Reducing the dose is always an option too. If it stays elevated despite those measures, especially alongside rising platelets or blood pressure, that combination is worth a licensed medical professional's attention.
Most
Panels Missing ApoB
Particle count is the most commonly missed marker we see — most panels have no particle-count data at all.
Wide Range
Total T on Blast (ng/dL)
The lab flags it as high, but the user reports it's working. Total testosterone in this group commonly ranges from the high hundreds in lower-dose protocols up into the thousands on high-dose stacks.
Total testosterone tells you little without SHBG. AAS users often have SHBG suppressed to single digits, which means free T is disproportionately high relative to what the total number suggests. That's why some users report strong effects at a total T that looks unremarkable on paper if their SHBG is naturally low, while others with a higher total T but higher SHBG feel less. Always request free testosterone and SHBG alongside total T — a low SHBG means more of the total is biologically active than the raw number implies. Don't chase total T numbers in isolation; read them alongside SHBG and how you actually feel.
Ranked roughly by how often each one shows up outside athletic reference ranges in the AAS users we see, from most to least common:
Common Abnormality Pattern, Most to Least Frequent
| Marker | Marker | How Common on Blast |
|---|---|---|
| Low HDL | Very common | The most universal AAS effect. Affects nearly every user regardless of compound. |
| Elevated Hematocrit | Common | More common on boldenone, oxandrolone, and high-dose testosterone. |
| High Total Testosterone | Expected by design | Lab-flagged as "high" but intentional. Useless as a safety marker on cycle. |
| Low SHBG | Common | Pharmacologically suppressed by AAS. Makes free T calculations unreliable. |
| Elevated AST | Common | More muscle than liver in most cases. Check CK and GGT to confirm. |
| Elevated Creatinine | Common | Reflects muscle mass and recent training, not kidney damage. |
| Elevated CK | Fairly common | Training-induced muscle enzyme release. Can exceed 1000 U/L. |
| Low LDL Particle Size | Fairly common | Pattern B phenotype under AAS. Small dense LDL is more atherogenic. |
| Elevated ALT | Less common | Less common than AST but more specific. Often normal in injectable-only cycles. |
😲A minority of users on blast keep their HDL in a genuinely healthy range, which says something real about how much individual genetics and compound choice matter. Your training partner's results on the same cycle do not predict yours.
The Users Who Defy the Trend
Not everyone crashes their HDL. A minority of users maintain a healthy HDL even on heavy cycles, and they tend to share a few characteristics: testosterone-only cycles (no orals, no 19-nors), consistently high omega-3 intake, and naturally high HDL before starting AAS.
Your baseline genetics are the whole ballgame. If you're walking in with naturally high HDL, you've got a buffer, you can afford to lose some before you're in the danger zone. But if your baseline HDL is already 35-40 mg/dL, a moderate cycle alone could drop you into single digits. That's why you need to know your baseline before you start.
The lesson here is to get a full baseline panel before you ever pin. That means lipids, liver enzymes, kidney markers, CBC, and hormones. If your baseline HDL is already 30, you have no room to lose. If your baseline hematocrit is 48, you will likely cross 54 on cycle. Knowing your baseline lets you set personal action limits, not generic reference ranges. For example, if your HDL drops 50% from baseline, that is a red flag even if the absolute number is still above 35. Track trends, not just single values. The athletes who avoid problems are the ones who have a year of baseline data before they start. If you are already cycling, start now; it is never too late to establish a reference.
The markers we most frequently see missing from uploaded blood panels tell their own story about gaps in standard medical care:
Missing from most panels
Skip ApoB and you're flying blind on cardiovascular risk. It's the single most important marker we're missing in this dataset.
Almost never included
Every AAS user should request this test, because it separates training-elevated creatinine from actual kidney impairment.
Frequently omitted from liver panels
This marker separates muscle-leak AST/ALT from true hepatobiliary stress, which is exactly why it matters for anyone running compounds that push the liver. It's the most underrated liver marker for athletes, hands down.
Rarely included
Chronic inflammation is a known AAS side effect, yet it flies completely under the radar for most guys running cycles. Nobody checks for it, nobody talks about it, and that's a shame because monitoring it is simple, cheap, and tells you a hell of a lot about what's going on under the hood.
High-sensitivity CRP is one of the cheapest inflammation markers you can add. AAS use, especially with orals, can raise CRP through hepatic stress and increased cytokine activity. An elevated CRP that persists after a cycle is worth a licensed medical professional's attention rather than something to self-manage, since chronic inflammation is a driver of atherosclerosis and insulin resistance. Diet, alcohol, and sleep all plausibly contribute and are reasonable things to look at, but treat any supplement regimen as a conversation with whoever manages your health, not a substitute for finding out why CRP is elevated in the first place. Do not ignore CRP; it is a window into systemic stress that standard panels miss.
The eGFR Trap
The single most misinterpreted number across every lab we reviewed is eGFR calculated from creatinine. In strength athletes, eGFR by creatinine almost always reads below 90, even when cystatin C shows normal kidney function.
eGFR formulas were validated in sedentary populations with average muscle mass, and that's exactly the problem. A 200 lb bodybuilder on 500 mg of testosterone has double the average creatinine production. Their kidneys are fine. The formula is wrong for their physiology.
A large majority of the AAS users we see have an eGFR below 90 when measured by creatinine, while abnormal Cystatin C is genuinely uncommon in the same group. That gap tells you something important: if you're relying on eGFR alone to track kidney health, you're very likely getting a distorted picture. Adding Cystatin C to the panel is what tells you whether that's a muscle-mass artifact or something real.
Cystatin C is the gold standard for kidney function in athletes because it is independent of muscle mass. It's a modest add-on cost and isn't always covered, but it's worth it. A low eGFR by creatinine is a reason to check Cystatin C, not to panic — if Cystatin C comes back normal, that's real reassurance about kidney function; if it's also elevated, that's a result to bring to a licensed medical professional promptly. If you are using an ACE inhibitor or ARB for blood pressure, those can affect creatinine but not Cystatin C. Always pair creatinine with Cystatin C for a true picture, and don't let a misleading eGFR alone become the reason to stop an otherwise well-tolerated cycle without checking further first.
Testosterone-Only vs. Stacked Cycles
Users on testosterone-only cycles consistently show meaningfully better lipid profiles than those stacking orals and 19-nor compounds on top — HDL in the testosterone-only group tends to sit clearly higher than in the stacked group.
This is not an argument against stacks. Many users need multiple compounds to achieve their goals. But it is a reminder that every additional compound adds physiological cost. If you are stacking, you must monitor more aggressively, not less.
Cycle Duration and Recovery
Users who kept their cycles to 12 weeks or less consistently bounced back faster on both HDL and hematocrit than those running 16+ week cycles. The gap shows up most clearly in HDL recovery, which takes noticeably longer to return to baseline after an extended cycle than after a shorter one.
This is consistent with the principle that longer exposure to androgens creates deeper metabolic remodeling. Your body adapts to the presence of AAS over time, and that adaptation takes longer to reverse. Time on equals time off is not just a convention, it is supported by real recovery data.