What Lab Tests Are Needed Before Starting Bioidentical Hormone Therapy?

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Dr. James D. Fontaine

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3/15/2026

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Are you considering bioidentical hormone replacement therapy, but not sure what tests you'll need first? Lab tests are essential for identifying hormone imbalances and determining the right treatment plan. 

 At Fontaine MD Aesthetics and Anti-Aging Medicine in San Diego, CA, Dr. James D. Fontaine uses comprehensive testing to create personalized plans. If you're experiencing menopause symptoms or want to book a testosterone test, call today for a consultation. 

Symptoms of a hormonal imbalance 

Hormone imbalances commonly occur in women over 40, though they can also affect younger women who've had a hysterectomy. Common symptoms include fatigue, decreased sex drive, trouble sleeping, weight gain, mood changes, and mental fog. 

For men, these imbalances can lead to erectile dysfunction, loss of muscle mass, fatigue, and decreased libido. Addressing these changes with bioidentical hormones can help restore your health and quality of life. 

What are bioidentical hormones? 

So, what are bioidentical hormones? These hormones are structurally identical to the hormones your body naturally produces. They're used to address hormonal imbalances and restore levels to their optimal state. 

By stabilizing hormones, bioidentical hormone replacement therapy (BHRT) can improve mood, sexual performance, energy, sleep, mental focus, and more. 

Why lab testing is important before and after BHRT 

Before starting hormone treatment, comprehensive lab testing is essential to identify which hormones are out of balance and by how much. This allows Dr. Fontaine to create a custom treatment plan. 

For example, a testosterone test may be ordered to check testosterone levels in men, as low testosterone can cause fatigue, decreased sex drive, and mood changes. Testing for low estrogen is also common in women, especially for women experiencing early menopausal symptoms. 

Follow-up testing is also done after a few months of starting hormone treatment to monitor your progress and make adjustments as needed. This ensures your hormone levels stay consistent and your symptoms continue to improve. 

How BHRT treatment works 

Once your lab results are reviewed in San Diego, CA, Dr. Fontaine can address your specific symptoms through treatment. BHRT may involve hormone pellets, creams, patches, or other methods based on your preferences and needs. 

The goal of BHRT is to help you feel like yourself again, whether you're dealing with low estrogen, low testosterone, or other hormone imbalance issues. And as mentioned, regular monitoring and adjustments ensure the process continues to work effectively over time. 

Results you can expect from BHRT 

Many patients notice improvements in energy levels, mood, sexual desire, and mental clarity within a few weeks to months of starting bioidentical hormone replacement therapy. 

Long-term benefits include enhanced sexual performance, better sleep, improved weight management, and sharper mental focus. By restoring your hormone levels, treatment helps you regain vitality and well-being. 

Results vary depending on your specific situation, but with proper testing, including a testosterone test and personalized treatment, most patients experience noticeable improvements. 

Get tested and start feeling better 

So, what are bioidentical hormones, and how does hormone therapy work? If you have questions or are experiencing fatigue, low sex drive, or other signs of hormone imbalance, Fontaine MD Aesthetics and Anti-Aging Medicine in San Diego, CA, is here to help. Dr. James D. Fontaine specializes in treatment for low estrogen, low testosterone, and other issues. Call today and see how bioidentical hormones can help you feel better.

When I came to Dr. Fontaine several years ago, I was going into early menopause and experiencing so many symptoms. Hot flashes, fatigue, pain, brain fog, and depression that were being dismissed by my regular doctors. Dr. Fontaine was truly a godsend. He listened, took my concerns seriously, and helped me create a plan that worked for my body. Over time, we adjusted my medication, and I now feel 100% better. I’m so grateful for his care and support!

A.H. Google

Louise initially treated me with Botox at an MD clinic I had been using for years. I was so pleased with my results, when she moved to Fontaine MD I followed her even though it was much farther away. Recently, I decided to also get fillers and expressed to her my desire for a very natural and youthful look, and she nailed it! She is a licensed RN with an Art degree therefore she really understands the anatomy and symmetry of the face. She is welcoming, professional, never rushes and very skilled at injecting both Botox and fillers, I highly recommend Louise!I also highly recommend Fontaine MD, great Doctor, and staff in a lovely, serene setting. They were instrumental in aiding me in a 20+ lb weight loss (so easy) and I could not be more grateful. I feel and look so much better and have maintained my new weight. That is not easy for many 60-year-old females.

L.L. Google

Louise is absolutely wonderful to work with! I have seen her for both an IPL facial and Botox (my very first time!). She took the time to answer my questions, address my concerns, and put my mind at ease. I could sense that I was in the hands of someone who was going to take care of me. Louise cares about her clients and their desired outcomes. I have done IPL facials in the past with other providers and the procedures felt very harsh on my skin. With Louise, my skin was not red, bumpy, or painful after and my sunspots were treated effectively! I also trusted Louise with my first Botox experience. Louise made me feel both comfortable and excited about the natural but effective results I was hoping to have! I am thankful I found Louise and will be a returning client!

N.B. Yelp

Louise listened to my skin concerns, made recommendations and completed Botox and filler procedures that that made an amazing difference!

C.T. Google

Before seeing Dr. Fontaine, I had no idea I could feel better. I just assumed that as I got older, low energy, hormonal struggles, and general decline were just part of life—something I had to accept. Looking back, I realize how much I had normalized feeling exhausted, unmotivated, and off-balance. My energy had dipped, my sleep was inconsistent, and no matter what I did, things like weight gain and mood swings seemed unavoidable. I wasn’t in crisis—I just wasn’t thriving. Dr. Fontaine completely changed that. From the first appointment, he took the time to listen, evaluate my symptoms, and explain what was really happening in my body. Seeing my lab results was an eye-opener—I finally had real data that explained why I felt the way I did. Within a couple of months of starting treatment, I started feeling like myself again. My energy improved, my focus sharpened, and I finally started sleeping through the night. Over time, the changes were undeniable—I was stronger, my mood was steady, and I didn’t feel like I was constantly fighting against my own body. Dr. Fontaine has been with me every step of the way, adjusting my treatment as needed and making sure I feel my best. He’s thorough, knowledgeable, and truly invested in his patients' well-being. I never feel rushed in my appointments, and he always takes the time to answer my questions. I didn’t realize how much I was missing out on until I started feeling this good again. Now, I feel like I’ve regained the energy, confidence, and vitality I thought were long gone. I’m beyond grateful to Dr. Fontaine for helping me.

C.M. Google

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