What Blood Tests Should I Get for Irregular Periods?

The best blood tests for irregular periods are FSH, LH, estradiol, TSH, testosterone, DHEA-S, and prolactin. These identify the three most common treatable causes: hormonal imbalances, thyroid dysfunction, and PCOS. Testing on cycle day 2-5 gives the most accurate baseline results.

Possible Causes

PCOS (Polycystic Ovary Syndrome)HypothyroidismPerimenopauseHyperthyroidism

Recommended Tests

Recommended panel8 tests · 10 biomarkers
PCOS & Irregular Cycles Panel

$121 + $18 order fee · $139 all-in

The 8 tests ordered separately: $126 (save $5)

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Includes 5 of the 9 recommended tests below (not included: FSH, LH, Estradiol, Progesterone), plus 3 more.

FSH

$13

Measures FSH levels important for reproductive function and fertility assessment.

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LH

$9

Measures LH which triggers ovulation and testosterone production.

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Estradiol

$15

Measures the primary form of estrogen. Important for reproductive health in both men and women.

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Progesterone

$27

Measures progesterone levels important for menstrual cycle and pregnancy.

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TSH

$9

Measures thyroid-stimulating hormone to evaluate thyroid function. TSH is the most sensitive marker for detecting thyroi...

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Testosterone

$34

Comprehensive testosterone panel measuring both free and total testosterone levels.

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DHEA-S

$14

Measures DHEA-S, a precursor hormone from the adrenal glands. Declines with age.

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17-OHP

$26

Screens for nonclassic congenital adrenal hyperplasia in people with high androgen symptoms.

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Prolactin

$12

Measures prolactin hormone. Elevated levels can affect fertility and menstrual cycles.

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All 9 recommended tests

$159 + one $18 order fee = $177 all-in

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When to See a Doctor

Seek immediate medical attention if your symptoms are severe, rapidly worsening, or accompanied by warning signs (chest pain, shortness of breath, high fever). Blood tests are a valuable first step, but they don't replace evaluation by a healthcare professional.

Frequently Asked Questions

Related Symptoms

Mood SwingsBloatingLow LibidoFatigue

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Progesterone Lab Test: When and How to Order

When to test progesterone in your cycle and what the results mean for fertility.

FSH Lab Test: What It Is and When to Order

How FSH levels help evaluate fertility, menopause status, and ovarian reserve.

Content reviewed for accuracy by the JustLabs editorial team.