How should we monitor men receiving testosterone replacement therapy?

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Clinical Inquiries

How should we monitor men receiving testosterone replacement therapy?

J Fam Pract. 2010 December;59(12):711-712

By

Manuel Alsina, MD

Leilani St. Anna, MLIS, AHIP

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References

1. Calof OM, Singh AB, Lee ML, et al. Adverse events associated with testosterone replacement in middle-aged and older men: a meta-analysis of randomized, placebo-controlled trials. J Gerontol A Biol Sci Med Sci. 2005;60:1451-1457.

2. Isidori AM, Giannetta E, Greco EA, et al. Effects of testosterone on body composition, bone metabolism and serum lipid profile in middle-aged men: a meta-analysis. Clin Endocrinol (Oxford). 2005;63:280-293.

3. Wang C, Nieschlag E, Swerdloff R, et al. ISA, ISSAM, EAU, EAA and ASA recommendations: investigation, treatment and monitoring of late-onset hypogonadism in males. Int J Impot Res. 2009;21:1-8.

4. Morgentaler A, Schulman C. Testosterone and prostate safety. Front Horm Res. 2009;37:197-203.

5. Haddad RM, Kennedy CC, Caples SM, et al. Testosterone and cardiovascular risk in men: systematic review and meta-analysis of randomized placebo-controlled trials. Mayo Clin Proc. 2007;82:29-39.

6. Practice Committee of American Society for Reproductive Medicine in collaboration with Society for Male Reproduction and Urology. Androgen deficiency in the aging male. Fertil Steril. 2008;90(5 suppl):S83-S87.

7. Rhoden EL, Morgentaler A. Risks of testosterone-replacement therapy and recommendations for monitoring. N Engl J Med. 2004;350:482-492.

8. Seftel A. Testosterone replacement therapy for male hypogonadism: Part III. Int J Impot Res. 2007;19:2-24.

9. Petak SM, Nankin HR, Spark RF, et al. American Association of Clinical Endocrinologists medical guidelines for clinical practice for the evaluation and treatment of hypogonadism in adult male patients—2002 update. Endocr Pract. 2002;8:440-456.

10. Bhasin S, Cunningham GR, Hayes FJ, et al. Testosterone therapy in adult men with androgen deficiency syndromes: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2006;91:1995-2010.

EVIDENCE-BASED ANSWER

MONITOR HEMATOCRIT AND BONE MINERAL DENSITY (BMD) (strength of recommendation [SOR]: B, meta-analysis of non–patient-oriented outcomes). Monitoring prostate-specific antigen (PSA), performing prostate digital rectal examination, and observing symptom response to testosterone are also recommended, although direct evidence is lacking (SOR: C, consensus opinion).

Monitoring lipid levels is unnecessary (SOR: A, based on several meta-analyses), as is monitoring testosterone levels (SOR C, consensus opinion). Unless the patient is taking oral testosterone, no evidence exists for or against monitoring liver function (SOR: C, consensus opinion).

Evidence summary

A hematocrit >50% is the most frequent testosterone-related adverse event in clinical trials. In a meta-analysis of 19 randomized controlled trials (RCTs)—with a total of 1084 subjects, 651 on testosterone, 433 on placebo—testosterone-treated men were nearly 4 times as likely as placebo-treated men to have a hematocrit >50% (odds ratio [OR]=3.67; 95% confidence interval [CI], 1.82-7.51; number needed to harm [NNH]=14).¹ The clinical significance of the increase is unclear.

Increased BMD at lumbar spine
A meta-analysis of 5 RCTs with a total of 264 subjects (135 on testosterone, 129 on placebo) demonstrated a 3.7% (95% CI, 1.0%-6.4%) absolute increase over baseline in lumbar spine BMD after ?12 to 36 months of treatment.² However, pooled effects on lumbar spine BMD across all studies failed to reach statistical significance because of differences in baseline bone density among subjects (BMD increase=0.03 g/cm²; 95% CI, 0-0.07).

No studies in this meta-analysis showed statistically significant improvement in BMD at the femoral neck. We found no studies that demonstrated reduced fracture risk in patients taking testosterone replacement.

No correlation between testosterone therapy and cancer

FAST TRACK

Clinicians who prescribe testosterone therapy should monitor hematocrit and bone mineral density.

Although testosterone can stimulate the growth of locally advanced and metastatic prostate cancer,3 at least 16 longitudinal studies have failed to show any correlation between testosterone replacement and the development of malignancy.4 In the previously mentioned meta-analysis of 19 RCTs, rates of prostate cancer, PSA >4 ng/mL, increase in International Prostate Symptom Score (IPSS) >4, and prostate biopsies were all numerically higher in testosterone-treated men, but the differences between the testosterone and placebo groups weren’t statistically significant.1 Moreover, the average serum PSA level in the testosterone-treated men increased only 0.3 ng/mL from a baseline of 1.3 ng/mL.

Evidence-based answers from the Family Physicians Inquiries Network

How should we monitor men receiving testosterone replacement therapy?

References

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