Research
Hormonal
Testosterone replacement therapy increases hemoglobin and hematocrit levels in older hypogonadal men, requiring monitoring for polycythemia.
Testosterone therapy will increase your red blood cell count (hemoglobin). This is a known effect. You need regular blood tests to monitor this. If your levels get too high, your doctor may need to adjust your dose or perform phlebotomy (blood removal) to keep you safe.
GoodSupportsHIGH confidence
Hemoglobin increased significantly with testosterone by 3 months and was sustained throughout the study... Four men (24%) in the testosterone group developed elevations in hematocrit >52%.
Why this rating
RCT design, clear statistical significance, but small sample size limits generalizability of side effect rates.
Source
Testosterone Replacement in Older Hypogonadal Men: A 12-Month Randomized Controlled Trial
Rahmawati Sih et al. · The Journal of Clinical Endocrinology & Metabolism · 1997
DOI 10.1210/jcem.82.6.3988
rct · n=32Cited 895×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Testosterone replacement therapy (200 mg testosterone cypionate biweekly) significantly improves upper body strength (grip strength) in older hypogonadal men over a 12-month period.Good
- Testosterone replacement therapy significantly decreases serum leptin levels in older hypogonadal men, suggesting a hormonal modulation of adiposity regulation.Good
- Testosterone replacement therapy has no significant effect on memory, cognitive function, or prostate-specific antigen (PSA) levels in older hypogonadal men over 12 months.Good
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