Growth Hormone, Serum
Directly measures circulating growth hormone — which is released in short pulses with a half-life of minutes.
A single random GH level is nearly uninterpretable because of that pulsatility — which is exactly why IGF-1 is the marker to use instead for assessing GH status. GH itself is mainly useful in formal stimulation/suppression testing.
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Order directly through Marek Diagnostics — no doctor's visit needed, drawn at any Quest location in the US. Code CAMERON applies 10% off automatically.
Order this test — 10% off → Browse all 102 markers →What Growth Hormone, Serum is usually tested alongside
On its own, one marker is a data point. These panels include Growth Hormone, Serum plus the markers that make it interpretable — each names every test, why it is on the list, and loads the whole set into your cart in one click at 10% off.
includes this + 8 more markers — Using ipamorelin, CJC-1295, tesamorelin, sermorelin or MK-677 (ibutamoren).
Why your Growth Hormone, Serum might be wrong
Most abnormal results are interference, not disease. These are the things that measurably move this specific marker — check them before you change anything. Each one says whether the number is wrong and should be repeated, badly timed and should be redrawn, or real with a cause worth explaining.
GH is released in bursts, largely during deep sleep, and is undetectable between pulses. A random GH level is close to meaningless — a low value proves nothing and a high one may be a normal pulse.
GH deficiency and excess are diagnosed by stimulation and suppression testing, not a single draw. Use IGF-1 as the stable proxy.
Fasting, exercise and deep sleep all raise GH acutely and substantially — a value drawn after a hard morning session is not a baseline.
Any single value has to be read against what you were doing beforehand, which is most of why random GH is unhelpful.
What Growth Hormone, Serum means in combination
A single marker tells you a little. Combinations tell you the story — these are the named patterns this marker takes part in, and what each one points at.
Almost certainly nothing. GH is secreted in pulses during deep sleep and is undetectable between them, so a random draw catches a trough far more often than a peak. A single low GH is not evidence of deficiency.
IGF-1 is the stable proxy and it is the number to read. Genuine GH deficiency is diagnosed by stimulation testing, not a random level. If you are considering secretagogues, IGF-1 is the before-and-after marker.
Hepatic growth hormone resistance. The pituitary is shouting and the liver will not answer, because IGF-1 production requires adequate energy. This is the endocrine fingerprint of eating too little for your training load — not a growth hormone problem.
Eat more. No secretagogue overcomes this, because the missing input is calories rather than signal. See the RED-S and performance panels.
What to test next
Markers rarely answer alone. These are the ones that put Growth Hormone, Serum in context — each with its own full breakdown.
Frequently asked questions
0.05–3.0 ng/mL (random, fasting) Ranges vary by laboratory and assay — always compare to the range printed on your own report.
Optimal ranges, root causes and the full correction protocol are available inside Coach Cam's Peptide Academy.
See the full breakdown inside the Academy.
See the full breakdown inside the Academy.
You can order Growth Hormone, Serum directly through Marek Diagnostics without a doctor's visit — drawn at any Quest Diagnostics location in the US. Code CAMERON applies 10% off automatically.