Irregular periods? Hormone and blood tests doctors commonly advise

A cycle between about 21 and 35 days is usually considered regular. Periods that keep coming late, skip months, come too often or are very heavy can be due to PCOD, thyroid problems, high prolactin, stress or weight changes. Hormone blood tests help your gynaecologist understand what is going on and plan the next steps.

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Tests to ask about

Thyroid profile (T3, T4, TSH)

Thyroid imbalance commonly disturbs the cycle.

₹1,200 Book Details

Prolactin

High prolactin can stop or delay periods.

₹600 Book Details

LH & FSH

The LH:FSH pattern helps in PCOD and menopause evaluation.

₹565 Book Details

Testosterone

Raised in some women with PCOD, acne or extra hair.

₹735 Book Details

PCOD profile

Combines the common hormone tests in one booking.

₹2,350 Book Details

Fasting insulin

Insulin resistance is common with PCOD.

₹460 Book Details

Common reasons doctors look for

PCOD/PCOS – often with acne, weight gain or extra facial hair
Thyroid imbalance (low or high)
High prolactin – sometimes with milky discharge from breasts
Stress, sudden weight loss or gain, intense exercise
Pregnancy or breastfeeding
Approaching menopause (late 30s–40s)

How to prepare

LH, FSH and some other hormones are usually checked on day 2–5 of the period – follow your doctor's advice. Prolactin is best tested in the morning after resting. Fasting is needed only for fasting sugar, insulin or lipid tests (10–12 hours, water is fine).

When to see a doctor

If you might be pregnant, do a pregnancy test first. See a doctor urgently for very heavy bleeding soaking a pad every hour, bleeding with dizziness or fainting, severe one-sided lower abdominal pain, or any bleeding after menopause.

Irregular Periods – FAQs

Which tests are done for irregular periods?

Commonly thyroid (TSH), prolactin, LH, FSH, testosterone, blood sugar/insulin and CBC. Many labs offer a combined PCOD profile.

On which day should hormone tests be done?

LH and FSH are often tested on day 2–5 of the cycle. Your gynaecologist will tell you the right day for your case.

Can thyroid cause irregular periods?

Yes, both low and high thyroid can change cycle length and flow. TSH is one of the first tests doctors check.

Is ultrasound also needed for PCOD?

Often yes. PCOD is diagnosed using symptoms, blood tests and sometimes a pelvic ultrasound, as decided by your doctor.

This page is general information, not medical advice or a diagnosis. Please talk to a doctor about your symptoms.

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LIVER 12SERUM ALB/GLOBULIN RATIOALKALINE PHOSPHATASEBILIRUBIN -DIRECTBILIRUBIN (INDIRECT)BILIRUBIN - TOTALGAMMA GLUTAMYL TRANSFERASE (GGT)SGOT / SGPT RATIOPROTEIN - TOTALALBUMIN - SERUMSERUM GLOBULINASPARTATE AMINOTRANSFERASE (SGOT )ALANINE TRANSAMINASE (SGPT)
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VITAMIN 2VITAMIN B-1225-OH VITAMIN D (TOTAL)

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Irregular periods? Hormone and blood tests doctors commonly advise

Tests to ask about

Common reasons doctors look for

How to prepare

When to see a doctor

Irregular Periods – FAQs

All of these in one package

WOMEN BASIC PROFILE WITH UTSH

JAANCH - WOMENS SKIN CARE CHECKUP

FEMALE CYCLE 1

SENIOR CITIZEN PROFILE FEMALE

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