The lab work behind a safe start on hormone therapy

What a baseline is for

Every test on a pre-treatment panel should earn its place. In practice each one does one of three jobs. It confirms the problem, such as low testosterone in a man with symptoms. It rules out a look-alike, such as an underactive thyroid or low iron causing fatigue. Or it sets a starting value that later tests are compared against, such as hematocrit before testosterone.

We do not publish target hormone numbers. The right level is the one at which you feel well and stay safe, and that differs from person to person.

Tests that matter for everyone

Hormone symptoms overlap with many other conditions in midlife. Fatigue, weight gain, low mood and poor sleep can come from thyroid disease, anemia, blood sugar problems or medication side effects. A broad baseline catches those so you are not treated for the wrong thing.

• Fasting glucose and A1c, sometimes with fasting insulin, for blood sugar and insulin resistance
• Lipid panel, often with ApoB, since cholesterol changes in midlife and on some therapies
• Liver and kidney function, which affect how medicines are handled
• TSH, with free T4 if needed, to rule out thyroid disease
• Complete blood count and ferritin for anemia and iron stores
• Vitamin D and B12 when symptoms or diet suggest a gap

Before testosterone or enclomiphene

The Endocrine Society recommends diagnosing low testosterone only when you have symptoms and morning fasting total testosterone is clearly and consistently low on repeat testing. One low result is not enough, because levels vary from day to day and are lower later in the day. MedlinePlus notes that blood is usually drawn between 7 and 10 a.m. for this reason.

LH and FSH show whether the problem starts in the testes or in the brain's signals, which matters for choosing between testosterone and enclomiphene. SHBG helps interpret total testosterone, and estradiol and prolactin round out the picture. Before testosterone, hematocrit and PSA are essential: the guideline lists elevated hematocrit and a raised PSA without urology review among reasons not to start.

Before estrogen and progesterone

If you are over 45 with typical symptoms and changing periods, your clinician usually does not need hormone levels to diagnose perimenopause or menopause. MedlinePlus notes that high FSH is an expected finding at this stage, and testing is mainly useful when symptoms start early or the cause is unclear. The Menopause Society adds that hormone levels swing day to day and that symptom response, not a blood level, is the reliable guide to dosing.

Labs still matter. Metabolic, lipid and liver results feed into your individualized risk discussion about clots, stroke and breast cancer, and into the choice between a patch, gel or pill. If you have a uterus, your plan will include progesterone to protect the endometrium. Your clinician will also confirm that breast screening is up to date (the U.S. Preventive Services Task Force recommends a mammogram every two years from age 40 to 74) and ask about any unexplained bleeding, which needs evaluation before starting.

Tests we usually skip

Saliva hormone testing is not used to start or adjust therapy; the Menopause Society says it has not been shown to be accurate or reliable. A single random estradiol in perimenopause can mislead, since it can be high one week and low the next. The DUTCH Test can add context for some questions, but it is a second-line tool rather than a requirement before HRT.

Timing the draw correctly

Hormone results are only as good as the conditions they were taken under. Book testosterone draws in the early morning after an overnight fast, and repeat on a different day if the first result is low. If you still have periods, note your cycle day, because estradiol, progesterone and FSH change through the month. Pause high-dose biotin as advised, since it can interfere with thyroid and hormone assays. Our preparation guide walks through each step.

Reading the results together

Your clinician looks at results alongside your symptoms, history and medicines. If something other than hormones explains most of what you feel, such as low iron, an underactive thyroid or possible sleep apnea, that usually comes first. Sometimes both are true, and treating them together makes sense.

Once you start treatment, the baseline becomes your reference. Follow-up labs are timed to the therapy: men on testosterone typically have hematocrit and PSA rechecked, while women on HRT are monitored mainly by symptoms, bleeding patterns and periodic general health labs.

Already have recent labs?

Results from the past few months may cover some of what your clinician needs. Share them during your assessment, and only the missing pieces need to be drawn. The Comprehensive Lab Panel is $199 one-time with no membership fee, and your price is confirmed at the eligibility review. Hormone therapy plans are priced separately from labs.