Thyroxine Total (T4), Serum in Mumbai
Also called: Total T4 test, T4 test, Serum thyroxine test
Report
1 Parameters
The test at a glance
What it checks
Report delivery
Test for
Age group
Commonly advised for
What is a Thyroxine Total (T4), Serum ?
Know More About This Test
The Thyroxine Total (T4), Serum test measures the total amount of thyroxine hormone present in your blood. Thyroxine, also called T4, is one of the main hormones produced by the thyroid gland and plays a major role in regulating metabolism, energy production, body temperature, heart function, and overall growth and development.
This test measures both the bound and free forms of T4 circulating in the blood. Because most T4 is attached to proteins, the total T4 value reflects the overall hormone level rather than only the active portion. Doctors often interpret this result together with TSH and sometimes T3 to assess thyroid gland function more accurately.
Why Is This Test Recommended?
Your doctor may advise this test to:
Evaluate symptoms of hypothyroidism or hyperthyroidism
Assess thyroid gland function
Monitor ongoing thyroid treatment
Investigate abnormal TSH results
Help diagnose thyroid disorders such as goiter or thyroiditis
Symptoms or Conditions That May Require This Test
Unexplained tiredness or weakness
Weight gain or weight loss
Hair fall or dry skin
Feeling unusually cold or hot
Palpitations or rapid heartbeat
Anxiety, irritability, or restlessness
Constipation
Menstrual irregularities
Swelling in the neck or suspected thyroid enlargement
Why Do I Need This Test?
The thyroid gland influences many important body functions. Even mild hormone imbalance can affect energy levels, mood, heart rate, body weight, and menstrual health. Measuring total T4 helps doctors identify whether the thyroid may be underactive or overactive and whether additional testing or treatment is needed.
How Do I Prepare for the Test?
No fasting is usually required unless advised with other tests
Inform your doctor about thyroid medication, steroids, oral contraceptives, and supplements
Biotin supplements should ideally be stopped for 48–72 hours before testing, if medically appropriate
If you are already taking thyroid replacement medicine, your doctor may advise the best timing for sample collection
How Is the Test Performed?
A blood sample is collected from a vein in your arm and sent to the laboratory for analysis. The procedure is quick and usually completed within a few minutes.
What Do the Results Mean?
High Total T4: May suggest hyperthyroidism, excess thyroid medication, or certain thyroid conditions
Low Total T4: May suggest hypothyroidism, pituitary dysfunction, or other medical conditions affecting thyroid hormone production
Normal Total T4: Usually indicates normal thyroid hormone levels, but interpretation should always be done with TSH, T3, symptoms, and medical history
What Should I Do If Results Are Abnormal?
If your result is outside the normal range, your doctor may advise additional thyroid testing such as TSH, Free T4, T3, or thyroid antibody tests. Treatment depends on the underlying cause and should be guided by a qualified healthcare professional.
Factors That Can Affect Results
Thyroid medicines
Biotin supplements
Pregnancy
Birth control pills or estrogen therapy
Steroids and certain other medicines
Severe illness
Changes in blood protein levels
FAQs
Is Total T4 different from Free T4?
Yes. Total T4 measures both bound and free hormone, while Free T4 measures only the active unbound hormone.Do I need fasting for this test?
Usually no, unless your doctor has ordered it along with other fasting blood tests.Can medicines affect the result?
Yes. Thyroid medicines, oral contraceptives, steroids, and biotin supplements may affect the test result.Can this test alone diagnose thyroid disease?
Not always. It is usually interpreted along with TSH, T3, symptoms, and clinical findings.Can I do this test from home?
Yes, home sample collection can be used if available.
Who should take this test
T4 is the main hormone produced by the thyroid gland. This test is advised if:
- You feel tired, or unusually restless
- Your weight has changed without a change in diet
- You have hair fall, dry skin, or feel cold or hot more than others
- You have palpitations or tremors
- Your TSH result was abnormal
- You are on thyroid treatment and need a review
Thyroxine Total (T4), Serum testing in Mumbai
Tapadia Diagnostic Centre in Mumbai offers NABL-accredited Thyroxine Total (T4), Serum test from a Blood sample(s). Total T4 test, T4 test, Serum thyroxine test is also prescribed for Thyroid disorder evaluation, fatigue, weight changes, hair loss, cold or heat intolerance, palpitations. Established in 1989, this doctor-led diagnostic centre ensures high accuracy. Home sample collection and walk-in facility available at our Mumbai center. Pay at the centre with no advance payment. Book online or visit us.
Frequently asked questions
Related Pathology Tests in Mumbai
Centers You Can Choose To Visit
Thyroxine Total (T4), Serum in Mumbai
Rated 4.6 on Google
From 6,477 patient reviews across our Hyderabad centres.
Every report, kept for you
Past reports stay in your account and can be downloaded again.
NABL accredited
Every result reviewed by a qualified pathologist before it reaches you.
Four decades of practice
A family-run diagnostic centre, trusted by doctors and households since 1989
Medically Reviewed by Qualified Biochemists
Thyroxine Total (T4), Serum in Other Cities
Thyroxine Total (T4), Serum in Vijayawada
Thyroxine Total (T4), Serum in Visakhapatnam
Thyroxine Total (T4), Serum in Ahmedabad
Thyroxine Total (T4), Serum in Bengaluru
Thyroxine Total (T4), Serum in Mumbai
Thyroxine Total (T4), Serum in Secunderabad
Thyroxine Total (T4), Serum in Karimnagar
Thyroxine Total (T4), Serum in Hyderabad
Thyroxine Total (T4), Serum in Warangal
Thyroxine Total (T4), Serum in Aurangabad
HIV 1 & 2 Antibodies, Serum-Elisa Method in Mumbai
Dengue IgG, IgM Antibodies + NS1 Antigen-Rapid, Serum in Mumbai
Lipoprotein A (Lp A), Serum in Mumbai
Erythrocyte Sedimentation Rate (ESR) in Mumbai
Thyroxine Total (T4), Serum in Mumbai
Triiodothyronine Total (T3), Serum in Mumbai
CA 19.9 (Pancreatic Cancer Marker), Serum in Mumbai
NIPT with Microdeletions in Mumbai
NIPT Basic in Mumbai
Complete Blood Picture (CBP) in Mumbai
Serum Phosphorus Test in Mumbai
TIBC in Mumbai
Urology Profile in Mumbai
Beta HCG Free, Serum (Pregnancy Test) in Mumbai
Viral Screening in Mumbai
AFP Test in Mumbai
Microalbuminuria test in Mumbai
Diabetes Testing (FBS + PLBS) in Mumbai
Antithrombin III in Mumbai
D-dimer test in Mumbai
Creatine Kinase (CK) Test in Mumbai
AST Test in Mumbai
Cardiac Markers in Mumbai
Pap Smear - LBC in Mumbai
DVT Profile in Mumbai
Bleeding Time and Clotting Time (BT & CT) in Mumbai
Estradiol Test in Mumbai
hs-CRP Test in Mumbai
Alkaline Phosphatase (ALP) Test in Mumbai
Fertility Profile in Mumbai
Albumin blood test in Mumbai
Troponin T in Mumbai
Infertility Profile Extended in Mumbai
Electrolyte Panel in Mumbai
Anticardiolipin Antibodies (IgG) in Mumbai
PSA Test in Mumbai
FSH Test in Mumbai
STD Panel in Mumbai
PCOS Profile in Mumbai
Serum Iron Test in Mumbai
Cardiac Profile-III in Mumbai
Plasma Fibrinogen Test in Mumbai
HBsAg Test in Mumbai
Cardiac Biomarker Test in Mumbai
Herpes Simplex Virus (HSV) Types 1 and 2 Antibody Test in Mumbai
Antenatal Profile in Mumbai
Activated Partial Thromboplastin Time in Mumbai
Lipid Panel in Mumbai
Fine Needle Aspiration Cytology in Mumbai
CRP test in Mumbai
Joint Pain / SLE / Collagen Profile-I in Mumbai
PAPP-A Test in Mumbai
Insulin Test in Mumbai
Triple Screen Test in Mumbai
Anti-HCV Test in Mumbai
Basic Metabolic Panel (BMP) in Mumbai
Very low-density lipoprotein (VLDL) test in Mumbai
Free Testosterone in Mumbai
Triglycerides Test in Mumbai
Quad Screen in Mumbai
Folic Acid in Mumbai
Urinalysis in Mumbai
CEA Test in Mumbai
Ferritin Test in Mumbai
Transferrin Saturation% in Mumbai
Protein C Antigen in Mumbai
Alpha Feto Protein (AFP) - Fluid in Mumbai
CPK (MB) Test in Mumbai
Lupus Anticoagulant Testing in Mumbai
Reticulocyte Count in Mumbai
Infertility Profile-Basic in Mumbai
Beta hCG Test in Mumbai
DIABETIC PROFILE in Mumbai
LH Test in Mumbai
Anti-Müllerian Hormone (AMH) Test in Mumbai
Bile Salts and Bile Pigments, Urine in Mumbai
HbA1c in Mumbai
Vitamin D (1,25-Dihydroxyvitamin D) in Mumbai
Liver Function Test (LFT) in Mumbai
Anemia Profile Basic in Mumbai
Rheumatoid Factor in Mumbai
Widal Test in Mumbai
Bilirubin blood test in Mumbai
Inhibin A, Tumor Marker, Serum in Mumbai
Thyroid Function Tests in Mumbai
eGFR in Mumbai
Menopause Profile in Mumbai
EXTENDED DIABETIC PROFILE in Mumbai
LDH Test in Mumbai
Total Cholesterol Test in Mumbai
Random Blood Sugar Test in Mumbai
Total Protein Test in Mumbai
RPR test in Mumbai
Anti-dsDNA Test in Mumbai
HDL Cholesterol in Mumbai
Blood Type Test in Mumbai
ASO Titre in Mumbai
Blood Urea(Serum) Test in Mumbai
Postprandial Blood Sugar Test in Mumbai
Back Pain Profile in Mumbai
ANA test in Mumbai
Serum Creatinine Test in Mumbai
PT/INR Test in Mumbai
Fasting Blood Sugar Test in Mumbai
Extended Anemia Profile III Executive in Mumbai
Kidney Function Test (Renal Profile) in Mumbai
Serum Magnesium Test in Mumbai
Well-woman exam in Mumbai
LDL cholesterol test in Mumbai
Prolactin Test in Mumbai
Malaria Blood Smear in Mumbai
Liver Function Test (+GGT) in Mumbai
TPHA Test in Mumbai
Hepatitis B Surface Antigen (HBsAg) Test in Mumbai
Antenatal Profile 2 in Mumbai
TSH Test in Mumbai
Cardiac Catheterization in Mumbai
Cardiolipin Antibody (IgM) in Mumbai
Master Health Checkup in Mumbai
Calcium Profile in Mumbai
Coagulation Profile in Mumbai
Uric Acid Test in Mumbai
Vitamin D (25 - Hydroxy Vitamin D, Serum) in Mumbai
Globulin Test in Mumbai
Fever Profile Test in Mumbai
Connective Tissue Disease Profile in Mumbai
Calcium Blood Test in Mumbai
IHC in Mumbai
Estriol Unconjugated (E3) Test in Mumbai
Blood Typing in Mumbai
Vitamin B12 Test in Mumbai
Serum Cortisol in Mumbai
Double Marker Test in Mumbai
Pap Smear, Conventional in Mumbai
Protein S Activity in Mumbai
Non-Invasive Prenatal Testing (NIPT) in Mumbai
whole exome sequencing in Mumbai
Newborn Screening (NBS) in Mumbai
Renal Function Test (RFT) in Mumbai
