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

FSH

$10

Measures FSH levels important for reproductive function and fertility assessment.

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LH

$8

Measures LH which triggers ovulation and testosterone production.

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Estradiol

$12

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

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Progesterone

$12

Measures progesterone levels important for menstrual cycle and pregnancy.

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TSH

$8

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

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Testosterone

$32

Comprehensive testosterone panel measuring both free and total testosterone levels.

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DHEA-S

$11

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

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Prolactin

$12

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

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When to See a Doctor

If your irregular periods is severe, rapidly worsening, or accompanied by alarming symptoms (chest pain, shortness of breath, high fever), seek immediate medical attention. 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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Content reviewed for accuracy by the JustLabs editorial team.