Know Your Markers Before You Go Deeper
Bloodwork is the foundation of every informed decision on PEDs, hormones and TRT. This hub shows how to read blood test results one marker at a time, in plain language and with numbers from published studies.
Most scary results have a boring cause: hard training, dehydration or the wrong reference range. Some do not. The guides below help you tell the two apart.
Start With Your Result
Most men open this page with one flagged number. Pick the line that matches your report. Each one leads to the steroid blood work guide for that marker.
Core Bloodwork Guides
Blood test results explained by system: baseline labs, CBC, lipids, liver, kidneys and blood pressure. Start with the baseline, then read each marker in its own guide.
Blood Tests Before Steroids
Seven markers to check before a cycle: CBC, lipids, liver, kidney, glucose, hormones and blood pressure. Your baseline for every later test.
Hematocrit & Hemoglobin
On testosterone gel, hemoglobin rose about 7% and hematocrit about 10% in six months. How to read both on a CBC.
HDL, LDL & Triglycerides
Six weeks of oral stanozolol cut HDL by 33% and raised LDL by 29% in 11 lifters. How to read every line of a lipid panel.
AST, ALT & GGT
An updated healthy ALT limit for men is 30 U/L, not the usual 40. What AST, ALT and GGT each tell you.
Creatinine, eGFR & BUN
Active people had higher creatinine, 1.04 vs 0.95 mg/dL, with the same cystatin C. Why muscle skews kidney tests.
Blood Pressure Before Steroids
On 24 hour monitoring, 51% of current steroid users had systolic hypertension vs 17% of controls. Measure it right first.
Read Bloodwork Step by Step
Learning how to read blood test results works best in order: baseline first, then each marker with its partner, then timing.
Test Before Anything Changes
A baseline turns every later number into a comparison, not a guess.
Read Markers in Pairs
Blood test results explained in pairs: AST with CK, creatinine with cystatin C, HDL with LDL.
Separate Training From Damage
Hard sessions, hydration and muscle mass all move results.
Retest at the Right Time
Steroid blood work taken too early or too late can mislead you.
Steroids & Your Bloodwork
Does gear actually move each marker, and by how much? These guides answer the direct questions of steroid blood work, then link to the matching marker guide.
The marker guides above apply to anyone reading a lab result. The deep dives below look at anabolic steroid use, meaning doses above the normal range taken for muscle and performance. If you are on prescribed TRT rather than a cycle, the TRT and hormones hub covers your markers.
Do Steroids Raise Blood Pressure?
In 100 men on a cycle, systolic pressure rose 6.87 mmHg and was back at baseline three months after it. Six measured routes, and what lowered it in trials.
Do Steroids Raise Cholesterol?
In 19 strength athletes on steroids, HDL fell from 1.08 to 0.43 mmol/L. What orals, tren and high dose test do to lipids.
Do Steroids Damage Your Liver?
One cycle raised ALT 18.7 U/L, reversibly. Real injury is jaundice from orals, about 2 months in, with 0 deaths in 121 cases. How to tell muscle from liver.
Do Steroids Affect Your Kidneys?
FSGS in 10 long term users; creatinine stabilised in the 7 who stopped (PMID 19917783). Why creatinine misleads lifters and why cystatin C catches it (PMID 37680426).
Do Steroids Cause High Hematocrit?
Erythrocytosis reached up to 66.7% of men on prescription testosterone. Why red cells climb and what to do about it.
Why Is My CK High?
The CK reference range in 483 male athletes ran up to 1,083 U/L. How to read a scary CK result without panic.
How Often Should You Get Bloodwork on a Cycle?
The HAARLEM study drew blood 4 times: before, at the end, 3 months after and one year out. Lipids were back in 3 months; 34% still had low sperm at one year.
How to Read Blood Test Results Over a Cycle
Steroid blood work makes sense only as a series: before, during and after. One result on its own tells you very little.
Get a baseline panel
Steroid blood work starts before anything changes. The guide to blood tests before steroids lists seven markers: CBC, lipids, liver, kidney, glucose, hormones and blood pressure.
The largest prospective study of a cycle measured 100 men before, at the end, 3 months after and 1 year after the start.
Expect some markers to move
During the cycle, systolic pressure rose 6.87 mm Hg, LDL rose 0.45 mmol/L and HDL fell 0.40 mmol/L.
Mean hematocrit rose 0.03 L/L, which is about 3 points on most lab reports.
Retest once things settle
Three months after the cycle, those markers had returned to baseline in the same 100 men.
That is the usual window for a post cycle steroid blood work panel. The study only followed men for 1 year, so long term heart risk is unknown.
Steroid blood work is a before and after comparison. Without a baseline you cannot tell a real change from your normal.
Training Noise or a Real Problem
Hard lifting moves several markers that labs read as organ damage. Blood test results explained in pairs show which is which.
Training
Rose in bodybuilders using and not using steroids.
Stayed in the normal range in both bodybuilder groups.
Athlete range in 483 men ran up to 1,083 U/L.
Higher with more muscle: 1.04 vs 0.95 mg/dL.
Damage
Rise with liver injury, as in hepatitis.
Rose with AST and ALT in hepatitis patients.
Not a liver marker; read it next to AST.
Did not differ with activity, so it helps confirm kidney function.
High AST and ALT with normal GGT and high CK points to muscle, not liver. Retest after a few rest days before you assume damage.
6 Numbers From This Hub
These figures come up again and again in steroid blood work. Each one is cited in the guide it comes from.
Rise in systolic pressure, mm Hg, during a cycle in 100 men.
Drop in HDL after 6 weeks of oral stanozolol in 11 lifters.
Highest erythrocytosis rate in men on prescription testosterone.
Upper CK reference limit, U/L, in 483 male athletes.
Current steroid users with systolic hypertension, vs 17% of controls.
Time for pressure, lipids and hematocrit to return to baseline.
Most of these shifts are real but reversible within months. Blood pressure and HDL are the two to watch most closely during steroid blood work.
Steroid Blood Work: Frequently Asked Questions
Short answers on how to read blood test results from a cycle. Each one points to the full guide with the numbers.
Which blood tests should you get before a cycle?
The baseline panel covers seven areas: a CBC with hematocrit, a lipid panel, liver markers, kidney markers, glucose, hormones and blood pressure. Our guide to blood tests before steroids explains each one and why it matters.
Are high liver enzymes from steroids or from training?
Often from training. In one study, bodybuilders using and not using steroids both had high AST and ALT, while GGT stayed normal. Rest a few days and retest. Knowing how to read blood test results in pairs, AST next to CK, avoids most false alarms.
How much do steroids change cholesterol?
In 100 men on a cycle, LDL rose 0.45 mmol/L and HDL fell 0.40 mmol/L. Oral stanozolol cut HDL by 33% in six weeks in a small trial.
Why does hematocrit go up on steroids?
Testosterone raises erythropoietin and lowers hepcidin, so the body makes more red cells. A 2025 review found erythrocytosis in up to 66.7% of men on prescription testosterone.
Can muscle mass make creatinine look high?
Yes. Active people had higher creatinine than sedentary people, 1.04 vs 0.95 mg/dL, while cystatin C did not differ. Ask for cystatin C if creatinine is flagged. That is blood test results explained in context, not in isolation.
How long after a cycle do blood test results return to normal?
In 100 men, blood pressure, lipids and hematocrit were back to baseline 3 months after the cycle. That is why a post cycle retest is usually timed for that window.
Explore Other Hubs
Every topic on Muscle Science has its own hub. Move to the next one from here.
Testosterone therapy, labs and side effects.
How to read every marker on your report.
What each compound does to the body.
Hub →SteroidsCompounds explained one by one.
Hub →Cycle DesignHow cycles are structured and why.
Hub →PCTRecovery after a cycle.
Hub →PeptidesResearch peptides and what is known.
Hub →SupplementsEvidence on popular supplements.
Hub →TrainingPrograms and lifting technique.
Hub →NutritionDiet, protein and calories for muscle.
