Why Bloodwork Matters
Running compounds without bloodwork is driving blind at 100mph. You might feel fine — until you don't. Here's why testing is non-negotiable.
Establish Your Baseline
Know your numbers BEFORE you start anything. Without a baseline, you have no way to measure progress or detect problems.
Track Real Progress
"I feel better" isn't data. IGF-1 up 40%? HDL stable? That's proof your protocol is working.
Catch Problems Early
Liver enzymes creeping up? Hematocrit getting thick? Blood tests catch silent problems before symptoms appear.
Optimize Your Dosing
More isn't always better. Bloodwork shows your response curve — hit the sweet spot, avoid the side effects.
📋 On this page
The Three Testing Phases
Every compound protocol follows the same testing rhythm: baseline, mid-cycle, and post-cycle. Miss any phase and you're missing critical data.
Baseline Testing
Full panel before you start anything. This is your reference point for everything that follows. Include all markers relevant to your planned compounds — don't skip IGF-1 if you're running GH peptides, don't skip hormones if you're running SARMs.
Mid-Cycle Check
Your compounds have had time to take effect. This draw confirms they're working and screens for red flags. IGF-1 should be elevated on GH peptides. Liver enzymes should be stable. Lipids shouldn't be tanking.
Post-Cycle Recovery
You've stopped — now confirm you've recovered. Compare to your baseline: is everything back to normal? If not, you need more time or intervention before starting anything new.
Bloodwork by Compound Category
Different compounds stress different systems. Here's exactly what to test for each category, with optimal ranges and why each marker matters.
Growth Hormone Peptides
CJC-1295, Ipamorelin, MK-677, Sermorelin, Tesamorelin
Primary marker for GH peptide response. Rising IGF-1 = peptides are working. Too high (>350) may increase certain health risks.
GH peptides can elevate blood sugar. MK-677 in particular may cause insulin resistance over time. Monitor closely.
3-month average of blood sugar. Catches gradual metabolic shifts that fasting glucose might miss.
Low insulin = good insulin sensitivity. Rising levels indicate developing resistance — time to reassess dosing or add metformin.
Some GH peptides and MK-677 can elevate prolactin. High prolactin = low libido, gyno risk. Check if symptoms appear.
Healing Peptides
BPC-157, TB-500, GHK-Cu, Thymosin Beta-4
General health marker. TB-500 affects cell migration and healing — CBC tracks overall blood cell health and immune function.
Systemic inflammation marker. Should decrease if healing peptides are working. Rising CRP = something's wrong.
Another inflammation marker. CRP + ESR together give a complete inflammation picture.
Basic safety monitoring. Any injectable peptide should be paired with liver enzyme checks.
SARMs
RAD-140, LGD-4033, Ostarine (MK-2866), S-23, YK-11
SARMs suppress natural testosterone production. Track this to know how suppressed you are and whether PCT is needed.
Pituitary hormones that signal testosterone production. Low LH/FSH = your body's not making the signal. Critical for PCT planning.
SARMs TANK HDL — often by 30-50%. This is the most predictable side effect. Monitor closely, use fish oil, keep cycles short.
Oral SARMs stress the liver. RAD-140 and YK-11 are particularly hepatotoxic. 3x upper limit = stop immediately.
Suppressed testosterone means less aromatization. Low E2 causes joint pain, mood issues. Track alongside T.
📚 More on SARMs: Complete SARM Guide
TRT & Hormone Optimization
Testosterone, HCG, Enclomiphene, Clomid, Gonadorelin
The primary marker. On TRT, you're targeting the upper range of normal. On enclomiphene, tracking if your body's responding.
The bioavailable fraction. High SHBG can mean high total T but low free T. This is what your tissues actually use.
Testosterone aromatizes to estrogen. Too high = water retention, gyno. Too low = joint pain, low libido. Balance is key.
Testosterone increases red blood cell production. >54% = blood is too thick, stroke risk increases. Donate blood if elevated.
Prostate marker. Testosterone doesn't cause prostate cancer, but it can accelerate existing issues. Baseline and monitor.
Binds testosterone, making it unavailable. High SHBG = high total T but low free T. Low SHBG = more free T per unit total.
📚 Deep dive: Testosterone Bloodwork Guide • Enclomiphene Guide
GLP-1 & Weight Loss
Semaglutide, Tirzepatide, Retatrutide, Liraglutide
GLP-1s dramatically improve glycemic control. This is the primary efficacy marker — watch it drop over 3-6 months.
Short-term glucose control. Should improve early, even before significant weight loss.
Weight loss dramatically improves lipids. Triglycerides drop first, then LDL. Track your metabolic improvements.
Caloric restriction can downregulate thyroid. Monitor for hypothyroid symptoms, especially with rapid weight loss.
Pancreatic enzymes. GLP-1s carry small pancreatitis risk. Check if you experience severe abdominal pain.
Nootropics & Longevity
NAD+, Methylene Blue, Semax, Selank, Epithalon
Many nootropics are metabolized by the liver. Basic safety monitoring, especially with oral compounds.
Kidney clearance matters for peptide elimination. Declining GFR means slower clearance and potential accumulation.
Cardiovascular and cognitive risk marker. NAD+ precursors can affect methylation pathways. Keep this optimized.
Methylene blue can affect B12 metabolism. Low B12 causes cognitive issues that mimic what you're trying to fix.
The Essential Panels
Don't order random tests. Here are the actual panel names and what's included in each. Mix and match based on your compounds.
Basic Panel
- CBC (Complete Blood Count)
- CMP (Comprehensive Metabolic)
- Lipid Panel (LDL, HDL, Triglycerides)
Bare minimum for anyone. ~$50-80
Hormone Panel
- Total Testosterone
- Free Testosterone
- Estradiol (E2)
- LH, FSH
- SHBG
- Prolactin
- DHEA-S
For TRT, SARMs, PCT. ~$150-200
Metabolic Panel
- Fasting Glucose
- HbA1c
- Fasting Insulin
- Thyroid (TSH, T3, T4)
For GLP-1s, GH peptides. ~$100-150
Inflammation Panel
- CRP (C-Reactive Protein)
- ESR (Sed Rate)
- Homocysteine
For healing peptides, longevity. ~$50-80
GH Axis
- IGF-1
Essential for GH peptides. ~$40-60
Liver/Kidney
- Full Hepatic Panel (ALT, AST, ALP, Bilirubin)
- BUN
- Creatinine
- GFR
Safety monitoring. Usually included in CMP.
Where to Order Bloodwork
You don't need a doctor's order. These services let you order your own tests, use Quest or LabCorp draw sites, and get results directly.
HealthLabs.com
No doctor visit required. 2,000+ Quest & LabCorp locations nationwide. Results in 1-3 days. Easy-to-read reports. Excellent panel selection for peptide users including IGF-1 and hormone panels.
Visit HealthLabs →Walk-In Lab
Competitive pricing on individual tests. Uses Quest & LabCorp network. Good for custom panels when you know exactly what you need.
Visit Walk-In Lab →Ulta Lab Tests
Custom panel builder lets you pick exactly what you want. Frequent sales and discounts. Good option for comprehensive testing on a budget.
Visit Ulta Lab Tests →Marek Diagnostics
Built by the MPMD crew specifically for the biohacker community. Peptide-specific panels, telehealth consultations available. Premium service, premium price.
Visit Marek →Your Doctor
Insurance may cover baseline labs with the right codes. Ask for an "annual wellness panel with hormone add-on." May require explaining why you want certain tests.
Talk to your PCPHow to Read Your Results
Lab "normal" ranges are based on the general population — including sick people. Here's how to interpret your results like a biohacker, not a patient.
⚖️ Normal vs. Optimal
Lab reference ranges are wide. A testosterone of 300 ng/dL is "normal" but not optimal. Same with fasting glucose of 99. Aim for the optimal ranges in this guide, not just "in range."
🚨 Red Flags
These need immediate attention:
- Hematocrit > 54% — blood too thick
- Liver enzymes > 3x upper limit
- Fasting glucose > 125 mg/dL
- Creatinine rising rapidly
- HDL < 30 mg/dL
🔄 When to Retest
Mildly elevated markers? Retest in 4-6 weeks. Significantly elevated? Reduce dose or discontinue, then retest in 2-4 weeks. Don't wait for symptoms.
Common Bloodwork Mistakes
These are the errors that cost people time, money, and sometimes health. Don't learn them the hard way.
⚠️ No Baseline Before Starting
You start peptides, feel great, but have no idea what your IGF-1 was before. Now you can't tell if your $200/month protocol is actually working. Get baseline labs 2-4 weeks before starting anything.
⚠️ Wrong Tests for Your Compounds
Running GH peptides but only checking testosterone? That tells you nothing. On SARMs but skipping lipids? You're missing the most predictable side effect. Match your panels to your compounds.
⚠️ Ignoring Elevated Liver Enzymes
ALT at 80 on oral SARMs and you keep going because you "feel fine"? Liver damage is silent until it isn't. Enzymes over 3x normal = stop the compound, period.
⚠️ Assuming You Recovered
You finish a SARM cycle, wait a month, "feel normal," and start again. But you never confirmed your LH and testosterone recovered. Post-cycle bloodwork isn't optional.
⚠️ Testing at the Wrong Time
Testosterone peaks in the morning and can vary 30% throughout the day. Getting bloods at 3pm gives you unreliable data. Test fasted, in the morning, every time.
⚠️ Only Testing When Symptomatic
By the time you feel symptoms, the problem has been developing for weeks. Bloodwork catches issues before symptoms appear. Test on schedule, not just when something feels wrong.
Frequently Asked Questions
Essential Supplies
Gear you'll need for safe peptide handling and health monitoring. All links go to Amazon.