Before starting a steroid cycle, you need a comprehensive set of blood tests that cover your hormones, liver, kidneys, heart health, and blood cell counts. These baseline values serve two purposes: they reveal any pre-existing conditions that could make steroid use dangerous, and they give you a reference point to compare against during and after your cycle so you can spot problems early.
Hormonal Panel
Your hormone levels are the most important baseline to establish. At minimum, you need total testosterone, free testosterone, estradiol (a form of estrogen), luteinizing hormone (LH), follicle-stimulating hormone (FSH), and prolactin. Normal total testosterone for adult males falls between 291 and 1,100 ng/dL. Knowing where you sit in that range before introducing exogenous hormones is essential for recovery planning afterward.
LH and FSH are the two hormones your brain sends to your testes to signal testosterone and sperm production. Steroids suppress both, sometimes to near zero. If your LH or FSH is already low before you start, that’s a red flag worth investigating. Estradiol matters because steroids convert (aromatize) into estrogen in your body, and knowing your starting level helps you gauge how much that conversion is affecting you mid-cycle.
Prolactin is worth adding, especially if you plan to use compounds in the 19-nor family (like nandrolone or trenbolone), which can raise prolactin levels. In men, elevated prolactin can cause low sex drive and erectile dysfunction. For the most accurate prolactin reading, schedule your blood draw three to four hours after waking up, since levels fluctuate throughout the day.
Liver Function
Oral steroids in particular place significant stress on your liver. The key markers are ALT, AST, alkaline phosphatase (ALP), and total bilirubin. ALT and AST are enzymes your liver releases when its cells are damaged or inflamed. Elevated levels before you even begin a cycle could indicate fatty liver disease, alcohol-related damage, or another underlying issue that steroids would worsen.
If your baseline liver enzymes are already above the normal range, adding a hepatotoxic oral compound on top of that is asking for trouble. Having those numbers on file also makes it much easier to interpret mid-cycle bloodwork. A modest rise might be expected; a dramatic spike tells you something needs to change.
Lipid Panel
Steroids are well documented to disrupt cholesterol balance, typically by lowering HDL (the protective cholesterol) and raising LDL (the harmful kind). A systematic review in the International Journal of Cardiovascular Sciences confirmed that even low-to-moderate doses of anabolic steroids alter HDL, LDL, and triglyceride levels in people who resistance train.
Your pre-cycle lipid panel should include total cholesterol, HDL, LDL, and triglycerides. Optimal LDL is below 100 mg/dL. Borderline-high sits between 130 and 159 mg/dL, and anything above 189 mg/dL is considered very high. If your LDL is already elevated or your HDL is low before starting, a cycle will push those numbers further in the wrong direction, increasing your cardiovascular risk. This test requires fasting for 8 to 12 hours beforehand.
Complete Blood Count
A complete blood count (CBC) checks your red blood cells, white blood cells, and platelets. The most critical marker here is hematocrit, which measures what percentage of your blood is made up of red blood cells. Normal hematocrit for adult males is 41% to 50%. For females, it’s 36% to 44%.
Testosterone, whether natural or injected, stimulates red blood cell production. That’s why “taking testosterone” is specifically listed as a cause of high hematocrit. When hematocrit climbs too high, your blood becomes thicker and more viscous, raising the risk of blood clots, stroke, and heart attack. If your hematocrit is already at the upper end of the normal range before a cycle, you’re starting from a risky position. Hemoglobin, the oxygen-carrying protein inside red blood cells, should be tracked alongside hematocrit for the same reason.
Kidney Function
Your kidneys filter waste products from your blood, and steroid use combined with the high-protein diets and heavy training loads common in this population can strain them. The standard markers are serum creatinine and estimated glomerular filtration rate (eGFR).
Creatinine is a waste product your muscles generate. Healthy kidneys filter it out efficiently, so elevated blood creatinine suggests your kidneys aren’t keeping up. Your eGFR is calculated from your creatinine level along with your age, sex, height, and weight. A normal eGFR for a healthy adult is around 100, though it naturally declines with age. Average eGFR for someone in their 20s is about 116, dropping to around 93 by their 50s. An eGFR that stays below 60 for three months indicates chronic kidney disease. One important note: because creatinine comes from muscle breakdown, people with significantly more muscle mass can have slightly elevated creatinine without actual kidney problems, but having the baseline number still helps you track changes.
Prostate Health
A PSA (prostate-specific antigen) test is particularly important for men over 40, though younger users with a family history of prostate cancer should consider it as well. Testosterone and its derivatives stimulate prostate tissue, and an undetected prostate issue could be accelerated by steroid use.
Normal PSA levels increase with age. For men aged 40 to 50, normal is 0 to 2.5 ng/mL. Between 50 and 60, anything up to 3.5 ng/mL is considered normal. A PSA greater than 10 ng/mL carries over a 50% chance of prostate cancer. To get an accurate reading, avoid sexual activity (including masturbation) and vigorous exercise for 48 hours before the test, as both can temporarily elevate your PSA.
How to Prepare for the Blood Draw
Schedule your blood draw in the morning, ideally within a few hours of waking. Testosterone peaks in the early morning and declines throughout the day, so morning testing gives the most accurate hormonal snapshot. This timing also works well for prolactin, which should be measured three to four hours after you wake up.
Fast for 8 to 12 hours beforehand. This is required for an accurate lipid panel and helps with several other markers. Water is fine, but skip coffee, juice, soda, and flavored water. Don’t chew gum, smoke, or exercise during the fasting period. If you accidentally eat or drink something, let the lab know rather than hoping it won’t matter. You may need to reschedule.
If you’re taking any medications, especially finasteride for hair loss or prostate issues, mention them before the draw. These drugs directly affect PSA results and can mask abnormalities. Stop any supplements that might skew liver or kidney values for a few days beforehand, particularly anything containing biotin, which is known to interfere with several blood tests.
Putting the Full Panel Together
When you order bloodwork, you’re looking for a panel that covers all of the following:
- Hormones: total testosterone, free testosterone, estradiol, LH, FSH, prolactin
- Liver: ALT, AST, ALP, total bilirubin
- Lipids: total cholesterol, HDL, LDL, triglycerides
- Blood counts: CBC with hematocrit and hemoglobin
- Kidney: serum creatinine, eGFR
- Prostate: PSA (especially if over 40)
Some people also add thyroid markers (TSH and free T4), fasting glucose, and insulin to get a broader metabolic picture. These aren’t as directly affected by most steroid compounds, but they round out your understanding of your baseline health.
Plan to repeat these same tests mid-cycle (around weeks 4 to 6 for most compounds) and again 4 to 6 weeks after finishing post-cycle therapy. The mid-cycle draw catches problems while you still have time to adjust. The post-cycle draw tells you whether your body has recovered to its pre-cycle baseline, particularly your hormonal axis, liver enzymes, and hematocrit. Without that pre-cycle snapshot, you’re flying blind on all three.