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Gestational Thyroid Stimulating Hormone (TSH) Profile with Serum/Plasma Measurement

Published: August 9, 2026Updated: August 16, 2026

This test measures your thyroid-stimulating hormone (TSH) levels in your blood during pregnancy. TSH helps regulate thyroid function, which is important for both maternal and fetal health.

Quick summary

["Your TSH levels are checked to ensure your thyroid is working properly during pregnancy."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
50582-6
Short code
Gestational GTT Pnl Ur+SerPl
Synonyms
Gestational GTT Pnl Ur+SerPl
Category
glucose
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
true
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Pregnant women may have their TSH levels tested if they have a history of thyroid issues, symptoms like fatigue or weight changes, or if their doctor suspects thyroid problems. It may also be part of routine prenatal care for certain risk factors.

What to Expect Before the Test

You’ll typically have a simple blood draw, usually done in a clinic or lab. No special preparation is needed, but fasting may be advised depending on the lab’s protocol. Wear comfortable clothing and arrive with your doctor’s instructions if any apply.

What the Test Results Mean

TSH levels can vary naturally, especially during pregnancy. High or low levels may signal thyroid dysfunction, which could affect hormone balance and fetal development. Your doctor will interpret results in the context of your overall health and symptoms.

Common Symptoms of Thyroid Issues

If your TSH results are abnormal, you might experience symptoms like unexplained weight changes, fatigue, difficulty concentrating, or changes in mood. These can sometimes overlap with pregnancy-related symptoms, so your doctor will guide you next steps.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Gestational TSH Profile

Frequently asked questions

What could cause abnormal TSH levels during pregnancy?
Abnormal TSH levels during pregnancy can be caused by thyroid autoimmunity (e.g., Hashimoto’s thyroiditis or Graves’ disease), iodine deficiency, or other hormonal imbalances. High TSH may indicate hypothyroidism, while low TSH could suggest hyperthyroidism. Early detection helps manage these conditions to support fetal development.
How often will I need this test?
Your doctor may recommend retesting TSH levels periodically during pregnancy, especially if you have a history of thyroid issues or if symptoms persist. Follow-up tests are often scheduled based on your individual risk factors and lab results.
Can I take anything to prepare for this test?
No special preparation is usually required, but always confirm with your lab or doctor. Some tests may ask you to fast before drawing blood, so check their guidelines to avoid delays.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy