Warning about frequent blood donations used to decrease hematocrit.

NOTE: Be very careful if you donate blood more than every 3 months to decrease hematocrit. This could happen to you.



In the U.S., 70 percent of the blood supply comes from repeat donors. Limiting their giving may hamper a system that already suffers shortages. The Mayo Clinic predicts a 10 percent drop in its supply from its restrictions on donors after finding that one-third had iron deficiency.



“We want to make sure we don’t have a group of people walking around being iron deficient,” said Manish Gandhi, the medical director of the Mayo Clinic’s blood donation center. “Blood donation in the U.S. is an altruistic thing. We need to focus on what we should be doing to protect these wonderful donors.”



Almost 10 million Americans annually give blood. Still, that’s only 5 percent of those eligible, according to a national survey conducted by the U.S. Department of Health and Human Services. The agency’s REDS-III study, under way since 2011, is examining donors’ iron levels as part of an effort to improve blood banking and transfusion practices. Boosting the number of donors may be key to a healthier blood banking system.



http://www.bloomberg.com/news/articles/2013-07-15/u-s-blood-supply-threatened-as-donors-face-iron-losses
 

hCG Mixing Calculator

HCG Mixing Protocol Calculator

TRT Hormone Predictor Widget

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

Predicted Hormone Levels

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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