When low desire is worth testing

Situations where labs add value

When low desire clearly began with a stressful period, a new relationship issue or a new antidepressant, tests are less likely to explain it, though they may still be reasonable to rule out other issues.

In short, labs are most useful when they can change what happens next, either by revealing a treatable condition or by confirming that hormones aren't the issue.

• Desire dropped over months without an obvious life or relationship reason
• Men with fewer morning erections, erectile problems, loss of body hair or breast tenderness
• Fatigue, weight change, feeling cold, or other signs of a body-wide problem
• Irregular periods, hot flashes or night sweats suggesting the menopause transition
• A history of diabetes, thyroid disease, pituitary problems or long-term opioid use
• Before starting any hormone therapy, to establish a baseline

Useful tests for men

Testosterone should be measured in the morning, roughly between 7 and 10 a.m., when levels peak. A low result needs repeating on a separate morning before it's considered confirmed. The AUA uses 300 ng/dL total testosterone as a reasonable threshold, alongside symptoms.

• Total testosterone, with free testosterone or SHBG in some cases
• LH, to show whether low testosterone starts in the testes or in pituitary signaling
• Prolactin, when testosterone is low and LH is low or low-normal
• Hematocrit and PSA, if testosterone therapy is being considered
• Glucose or A1C and lipids, because ED and low testosterone often travel with metabolic disease

Useful tests for women

For women, testing is mainly about finding other conditions, not measuring desire. An international consensus statement advises that a blood testosterone level should not be used to diagnose hypoactive sexual desire disorder. During perimenopause, estrogen and FSH fluctuate so much that a single test rarely clarifies things.

• Thyroid function
• Blood count and ferritin, especially with heavy periods
• Glucose or A1C
• Prolactin, if periods have stopped unexpectedly or there's nipple discharge
• A baseline testosterone before testosterone therapy, mainly for safety monitoring rather than diagnosis

Tests that are rarely helpful

Large hormone panels ordered without a clear question often produce borderline results that create worry rather than answers. Saliva hormone testing has limited validation for guiding treatment. Testing estrogen and progesterone repeatedly during perimenopause usually adds little to symptoms and cycle history.

If your results are normal

A normal panel is useful information. It shifts attention to causes that don't appear in blood, such as medications, mood, sleep, pain with sex, stress and relationship factors. These are common and often very treatable.

It also means hormone treatment is unlikely to help, and may expose you to side effects without benefit.

Preparing for testing

At HealifyMD, the Comprehensive Lab Panel is $199 as a one-time cost, confirmed at your eligibility review.

• Schedule blood draws in the morning, particularly for testosterone.
• Ask whether fasting is needed for glucose or lipids.
• Tell your clinician about biotin supplements, which can interfere with some hormone tests.
• Note where you are in your menstrual cycle, if you still have periods.
• Avoid testing during an acute illness, which can temporarily lower testosterone.

Combining tests with history

Labs are interpreted alongside your story. A borderline testosterone in a man with clear sexual symptoms, obesity and sleep apnea means something different from the same number in a lean man without symptoms.

Likewise, a normal thyroid test in someone with heavy periods doesn't rule out iron deficiency. That's why your clinician will ask about cycles, sleep, mood, medications and relationship context before deciding which results matter.

How often to retest

If results are normal and symptoms are stable, repeat testing isn't usually needed unless something changes. If you start hormone therapy, follow-up labs are scheduled to check levels and safety markers, such as hematocrit and PSA in men.

Signs that need in-person care

Low desire with severe headaches, vision changes, milky nipple discharge, breast enlargement in men, or a testicular lump needs prompt in-person evaluation, as these can point to pituitary or testicular conditions.