Blood Panels for Biohackers: What to Test and When

Wearables tell you how you slept. Scans show you how your shape is changing. Neither can tell you what’s happening in your blood.

That’s why blood work is the most important feedback you can get when you’re running any kind of protocol. It’s the only place you’ll catch some side effects before you feel them. And it’s the only way to know whether a compound that’s supposed to change a hormone actually did.

Here’s what to test, when to test, and how to read the results without fooling yourself.

The Core Markers, and Why Each One Matters

Think of this as a menu to discuss with your clinician, not a prescription. What you need depends on your health, your history and what you’re tracking.

IGF-1. If you’re doing anything that targets growth hormone, this is the marker. GH acts largely through IGF-1, and because IGF-1 levels stay steady through the day, it’s the standard way to screen GH activity, according to MedlinePlus. Levels naturally decline with age, so results have to be read against an age-appropriate range.

Growth hormone itself. Usually less useful than you’d think. GH is released in pulses, so a single GH test may catch a peak, a trough or anything in between. In clinical practice, it’s mostly measured with stimulation or suppression testing.

Fasting glucose, HbA1c and insulin. Essential if anything you’re doing could affect insulin sensitivity. That includes GH-related compounds. In a two-year trial, the oral GH secretagogue MK-677 raised fasting glucose and reduced insulin sensitivity in older adults. HbA1c gives you a roughly three-month average, which smooths out day-to-day noise in blood glucose. Fasting insulin adds context.

Testosterone (total, and free if your clinician suggests it). Your broader hormonal backdrop. See the timing section below, because when you draw blood matters a lot. MedlinePlus on testosterone.

Estradiol. Often skipped in men’s panels, but useful context alongside testosterone. MedlinePlus on estrogen tests.

Morning cortisol. Cortisol follows a daily rhythm, so timing matters here too. MedlinePlus on cortisol.

TSH (thyroid). Thyroid problems are common and can mess with energy, weight and recovery regardless of anything else you do. A TSH test is the usual first check.

CBC. Red and white cells, hemoglobin, hematocrit, platelets. A broad health check. MedlinePlus on CBC.

Comprehensive metabolic panel. Glucose, kidney markers, liver enzymes and electrolytes in one draw. MedlinePlus on CMP.

Lipids. Total cholesterol, LDL, HDL, triglycerides. Long-term cardiovascular context. MedlinePlus on cholesterol.

Ferritin. Iron stores. Worth having if you train hard, donate blood or feel unexplained fatigue. MedlinePlus on ferritin.

When to Test

A single result tells you very little. You want a before and at least one after, taken the same way.

Before you start anything. This is the most important draw. Without a baseline, you can’t attribute any later change to what you did. If you’ve already started, a baseline now is still better than none.

At a midpoint. A smaller check on the markers most likely to move, as agreed with your clinician. This is where you catch problems early.

At the end of a tracking block. Repeat the baseline panel and compare marker by marker.

How long between draws depends on what you’re doing and on your clinician’s advice. Our 12-week tracking guide shows one way to line blood work up with scans and wearable data.

Keep Your Results Comparable

Most “changes” in blood work are noise created by inconsistent conditions. Control these:

Time of day. Testosterone is the classic example. In a study of men in Boston, Brambilla et al. (2009) found levels were 20–25% lower at 4 p.m. than at 8 a.m. in men aged 30–40, and some men who looked low in the afternoon were normal in the morning. The Endocrine Society guideline recommends morning fasting measurements and confirming low results with a repeat test.

Fasting. Do it the same way every time, or not at all, based on what’s being tested.

Training. Hard training the day before can shift some markers. Keep the day before a draw similar each time.

Illness and alcohol. A cold or a big night out can skew results. Reschedule if you can.

Same lab. Reference ranges and methods differ between labs. Switching labs mid-block adds noise you can’t remove later.

How to Read a Lab Report

Lab reports look intimidating, but most of them follow the same structure: the marker, your result, the units, and a reference range, sometimes with a flag for high or low.

A few things are worth understanding about that reference range. According to MedlinePlus, reference ranges are based on test results from large groups of healthy people. That has three consequences:

It’s common for healthy people to sometimes fall outside the range. A flag isn’t a diagnosis. Your clinician looks at it alongside everything else.

Being inside the range isn’t a guarantee of good health. Some people with health problems have “normal” results, which is why symptoms matter.

Ranges differ between labs. Labs use different methods, so you can only compare your result with the range on your own report, not with a number you found online. MedlinePlus makes the point directly: if you’re looking for trends, try to use the same lab.

Units matter too. The same marker can be reported in different units depending on the lab or country. If you switch labs, or move abroad, check the units before you compare anything, or you may think a marker tripled when it simply changed units.

Read Trends, Not Single Values

Here’s the mindset shift. A value inside the reference range isn’t automatically fine, and a value just outside it isn’t automatically a problem. What matters is where you started, which direction you’re moving, and whether that direction makes sense.

Say your fasting glucose was comfortably low at baseline and has crept up at every draw since you started something new. Every individual result might still be “normal.” The trend is the signal, and it’s worth a conversation.

The reverse is true too. A marker that didn’t move at all tells you something. Maybe the compound did nothing. Maybe it wasn’t what the label said. Either way, the data saved you from guessing.

A Worked Example (Illustrative)

Here’s a fictional example of reading a trend. The person and details are invented, and no real reference values are used.

Ben has blood drawn at the same lab, at 8 a.m., fasted, on a quiet day with no training the day before, at baseline, at week six and at week twelve of a tracking block his clinician is supervising.

His IGF-1 rises between baseline and week six, then holds steady. That’s the direction he and his clinician expected, and it stays within the lab’s range.

His fasting glucose is a little higher at week six than at baseline, and a little higher again at week twelve. Each value is still inside the reference range, so none of the results is flagged. On the PDFs, everything looks fine.

On a trend chart, the picture is different: a steady climb across three draws in the same direction. Ben adds an HbA1c result from the week-twelve draw, which also nudged up compared with baseline.

He doesn’t change anything on his own. He takes the chart to his clinician, who now has three comparable data points instead of one, and can make an informed decision. That’s the whole value of consistent testing in one example. No single result raised a flag. The trend did.

Common Mistakes

Skipping the baseline. Without it, a result has nothing to be compared against.

Testing at different times of day. Testosterone and cortisol both follow daily rhythms, so an afternoon draw and a morning draw aren’t comparable.

Switching labs. Different methods, different ranges, sometimes different units.

Reading one result in isolation. Healthy people sometimes land outside the range. Confirm and look at the trend.

Ignoring “normal” results that keep moving. A steady drift inside the range can matter more than a single flag.

Over-testing. Drawing blood every few weeks because you’re curious adds cost and noise without adding clarity. Agree on a schedule with your clinician.

Changing your protocol based on a single number. That decision belongs with someone who can see your full picture.

When to Pick Up the Phone

Don’t sit on these. Talk to your clinician promptly if:

• Any result is flagged well outside the reference range
• A marker moves steadily in the wrong direction across draws
• Glucose markers are rising
• Liver enzymes are elevated
• You have new symptoms at the same time as an abnormal result

And don’t adjust what you’re taking based on a number alone. That’s a decision for someone who can see your full picture.

Where Pinnacle Pulse Fits

If you’re on the Pro tier, you can enter blood panel results in Pinnacle Pulse and see them as trend charts next to your protocol log, sleep and HRV, rather than as a pile of PDFs. More on that on our Blood Work page. It won’t interpret your results for you, and it shouldn’t. It just makes the trend obvious when you sit down with your clinician.

For the wearable side of the picture, see HRV and recovery. And if you’re tracking a GH-related stack, our post on CJC-1295 and Ipamorelin explains why IGF-1 and glucose markers deserve a spot on your panel.

This article is for educational purposes only and is not medical advice. Lab results should be interpreted by a qualified clinician, and reference ranges vary between laboratories.

FAQ

Why is IGF-1 tested instead of growth hormone?

Growth hormone is released in pulses, so a single GH blood test can land on a peak or a trough. IGF-1 levels are much more stable through the day, which makes it the usual screening marker for GH activity.

What time of day should I get blood drawn?

Morning, ideally at the same time for every draw. Testosterone in particular is highest in the morning and can be substantially lower in the afternoon, especially in younger men. Ask whether you need to fast for the markers you're testing.

Do I need a doctor to order blood work?

It depends on where you live. Some places allow direct-to-consumer lab testing, others don't. Either way, have a clinician help you interpret results, especially anything outside the reference range.