Optimal Blood Test Timing

GreenMachineX

Well-Known Member
Gentz,
I've been on 7mg test cyp daily since January 23rd or so bumping up from 5mg daily. 6 weeks on that is pretty soon, but the question is since I'm doing my shots before bed, does it matter when I get the blood drawn? Should i skip the nightly dose the day before and get it drawn that next morning? Or do the shot and get it drawn the next morning or at lunch the next day anyway, even though it won't be technically trough?
 
Last edited:
Gentz,
I've been on 7mg test cyp daily since January 23rd or so bumping up from 5mg daily. 6 weeks on that is pretty soon, but the question is since I'm doing my shots before bed, does it matter when I get the blood drawn? Should i skip the nightly dose the day before and get it drawn that next morning? Or do the shot and get it drawn the next morning or at lunch the next day anyway, even though it won't be technically trough?
Peak/trough ratio close to unity and likely within 5 to at most 10% (very unlikely) with every day dosing. Doesnt matter much. See table in post attached.

 

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TRT Hormone Predictor

Predict estradiol, DHT, and free testosterone levels based on total testosterone

⚠️ Medical Disclaimer

This tool provides predictions based on statistical models and should NOT replace professional medical advice. Always consult with your healthcare provider before making any changes to your TRT protocol.

ℹ️ Input Parameters

Normal range: 300-1000 ng/dL

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Enter your total testosterone value to see predictions

Results will appear here after calculation

Understanding Your Hormones

Estradiol (E2)

A form of estrogen produced from testosterone. Important for bone health, mood, and libido. Too high can cause side effects; too low can affect well-being.

DHT

Dihydrotestosterone is a potent androgen derived from testosterone. Affects hair growth, prostate health, and masculinization effects.

Free Testosterone

The biologically active form of testosterone not bound to proteins. Directly available for cellular uptake and biological effects.

Scientific Reference

Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.

DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038

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