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Peter O'Brien, NP
Board-certified family nurse practitioner with a broad clinical background spanning critical care, family medicine and urgent care — six years in the intensive care setting, three years in family practice and eight years in urgent care.
Why the background matters
Peter's clinical background allows him to look at the full picture — not just a single symptom or lab result. He can evaluate your health history, order and interpret appropriate labs, determine whether treatment makes sense, and prescribe when clinically appropriate.
His experience across critical care, family medicine and urgent care has shaped a practical, thorough approach to medicine. Whether the concern is straightforward or more complex, the goal is the same: provide thoughtful, safe and personalized care with clear communication throughout the process.
My job is not to sell you testosterone. My job is to teach you about it, so we can do what's safe, ethical and medically right.
Credentials
- Board certificationAmerican Association of Nurse Practitioners
- California RNLicensed
- Nurse practitionerLicensed
- MSNSimmons College of Nursing, 2015
- BSNLakeview College of Nursing, 2009
Peter is licensed in California and board-certified through the American Association of Nurse Practitioners. License and registry details are available on request.
Experience
- Six years, intensive care unit
- Eight years, urgent care
- Ten-plus years total in critical care
- Telehealth practice across California
What he treats
How he practices
Bloodwork before prescriptions. Mechanism explained before instructions. Honest about what a treatment won't do, and willing to say no when treatment isn't right.
Some men shouldn't be on testosterone at all — here is how he decides.
Start with a conversation.
No charge to find out whether you're a candidate.