venkacelnor said:
Bioexplorer said:
venkacelnor said:
Hey everyone, just a brief update. Today my baseline IGF-1 results came in, so I now have a clear reference point prior to introducing HGH.
The result was 129 ng/mL, with the lab's reference interval listed as 58–219 ng/mL.
What's frustrating is that no Z-score for my age (41) appeared on the report — only the raw value and that broad range. I searched for an online calculator, but the Labcorp tool I came across caps out at age 18.
Does anyone know of a trustworthy site that computes adult Z-scores from age and ng/mL? Or can someone here walk me through the math so I can see precisely where I fall?
If not, I figure I'll just treat 129 as my baseline, start at 1 IU, and retest in eight weeks to see whether it pushes my numbers up or actually brings them down. What would you recommend I do?
Why not have an AI model run the math? Here's what Gemini came back with:
"Using typical statistical approximations for lab reference intervals, the
IGF-1 Z-score works out to -0.24."
That figure holds if the lab gave you the right age-based range, and for a 41 yo male it seems plausible. Is your goal to land in the high-normal zone? Keep us posted on what 1 is does for you.
Appreciate it, man.
I ran that check too. A simple linear estimate lands at -0.24, but adult IGF-1 reference ranges are right-skewed, so once you apply the correct log-transformed math, the true median for my age on this particular assay comes out to roughly 122 ng/mL. That shifts my real Z-score to +0.40.
As for what you asked: yeah, I'm aiming for the high-normal band (+1.0 to +2.0 SD). The primary reason is connective tissue and joint repair, since I'm moving toward heavier lifting in CrossFit.
My plan is to begin at 1 IU per day and re-test after 8 weeks. I'll come back with results then to show whether this dose raises my score or just blunts my natural baseline.
