Thyroxine Total (T4), Serum in Karimnagar
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 Karimnagar
Tapadia Diagnostic Centre in Karimnagar 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 Karimnagar center. Pay at the centre with no advance payment. Book online or visit us.
Frequently asked questions
Related Pathology Tests in Karimnagar
Thyroxine Total (T4), Serum in Karimnagar
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 Karimnagar
Dengue IgG, IgM Antibodies + NS1 Antigen-Rapid, Serum in Karimnagar
Lipoprotein A (Lp A), Serum in Karimnagar
Erythrocyte Sedimentation Rate (ESR) in Karimnagar
Thyroxine Total (T4), Serum in Karimnagar
Triiodothyronine Total (T3), Serum in Karimnagar
CA 19.9 (Pancreatic Cancer Marker), Serum in Karimnagar
NIPT with Microdeletions in Karimnagar
NIPT Basic in Karimnagar
Complete Blood Picture (CBP) in Karimnagar
Serum Phosphorus Test in Karimnagar
TIBC in Karimnagar
Urology Profile in Karimnagar
Beta HCG Free, Serum (Pregnancy Test) in Karimnagar
Viral Screening in Karimnagar
AFP Test in Karimnagar
Microalbuminuria test in Karimnagar
Diabetes Testing (FBS + PLBS) in Karimnagar
Antithrombin III in Karimnagar
D-dimer test in Karimnagar
Creatine Kinase (CK) Test in Karimnagar
AST Test in Karimnagar
Cardiac Markers in Karimnagar
Pap Smear - LBC in Karimnagar
DVT Profile in Karimnagar
Bleeding Time and Clotting Time (BT & CT) in Karimnagar
Estradiol Test in Karimnagar
hs-CRP Test in Karimnagar
Alkaline Phosphatase (ALP) Test in Karimnagar
Fertility Profile in Karimnagar
Albumin blood test in Karimnagar
Troponin T in Karimnagar
Infertility Profile Extended in Karimnagar
Electrolyte Panel in Karimnagar
Anticardiolipin Antibodies (IgG) in Karimnagar
PSA Test in Karimnagar
FSH Test in Karimnagar
STD Panel in Karimnagar
PCOS Profile in Karimnagar
Serum Iron Test in Karimnagar
Cardiac Profile-III in Karimnagar
Plasma Fibrinogen Test in Karimnagar
HBsAg Test in Karimnagar
Cardiac Biomarker Test in Karimnagar
Herpes Simplex Virus (HSV) Types 1 and 2 Antibody Test in Karimnagar
Antenatal Profile in Karimnagar
Activated Partial Thromboplastin Time in Karimnagar
Lipid Panel in Karimnagar
Fine Needle Aspiration Cytology in Karimnagar
CRP test in Karimnagar
Joint Pain / SLE / Collagen Profile-I in Karimnagar
PAPP-A Test in Karimnagar
Insulin Test in Karimnagar
Triple Screen Test in Karimnagar
Anti-HCV Test in Karimnagar
Basic Metabolic Panel (BMP) in Karimnagar
Very low-density lipoprotein (VLDL) test in Karimnagar
Free Testosterone in Karimnagar
Triglycerides Test in Karimnagar
Quad Screen in Karimnagar
Folic Acid in Karimnagar
Urinalysis in Karimnagar
CEA Test in Karimnagar
Ferritin Test in Karimnagar
Transferrin Saturation% in Karimnagar
Protein C Antigen in Karimnagar
Alpha Feto Protein (AFP) - Fluid in Karimnagar
CPK (MB) Test in Karimnagar
Lupus Anticoagulant Testing in Karimnagar
Reticulocyte Count in Karimnagar
Infertility Profile-Basic in Karimnagar
Beta hCG Test in Karimnagar
DIABETIC PROFILE in Karimnagar
LH Test in Karimnagar
Anti-Müllerian Hormone (AMH) Test in Karimnagar
Bile Salts and Bile Pigments, Urine in Karimnagar
HbA1c in Karimnagar
Vitamin D (1,25-Dihydroxyvitamin D) in Karimnagar
Liver Function Test (LFT) in Karimnagar
Anemia Profile Basic in Karimnagar
Rheumatoid Factor in Karimnagar
Widal Test in Karimnagar
Bilirubin blood test in Karimnagar
Inhibin A, Tumor Marker, Serum in Karimnagar
Thyroid Function Tests in Karimnagar
eGFR in Karimnagar
Menopause Profile in Karimnagar
EXTENDED DIABETIC PROFILE in Karimnagar
LDH Test in Karimnagar
Total Cholesterol Test in Karimnagar
Random Blood Sugar Test in Karimnagar
Total Protein Test in Karimnagar
RPR test in Karimnagar
Anti-dsDNA Test in Karimnagar
HDL Cholesterol in Karimnagar
Blood Type Test in Karimnagar
ASO Titre in Karimnagar
Blood Urea(Serum) Test in Karimnagar
Postprandial Blood Sugar Test in Karimnagar
Back Pain Profile in Karimnagar
ANA test in Karimnagar
Serum Creatinine Test in Karimnagar
PT/INR Test in Karimnagar
Fasting Blood Sugar Test in Karimnagar
Extended Anemia Profile III Executive in Karimnagar
Kidney Function Test (Renal Profile) in Karimnagar
Serum Magnesium Test in Karimnagar
Well-woman exam in Karimnagar
LDL cholesterol test in Karimnagar
Prolactin Test in Karimnagar
Malaria Blood Smear in Karimnagar
Liver Function Test (+GGT) in Karimnagar
TPHA Test in Karimnagar
Hepatitis B Surface Antigen (HBsAg) Test in Karimnagar
Antenatal Profile 2 in Karimnagar
TSH Test in Karimnagar
Cardiac Catheterization in Karimnagar
Cardiolipin Antibody (IgM) in Karimnagar
Master Health Checkup in Karimnagar
Calcium Profile in Karimnagar
Coagulation Profile in Karimnagar
Uric Acid Test in Karimnagar
Vitamin D (25 - Hydroxy Vitamin D, Serum) in Karimnagar
Globulin Test in Karimnagar
Fever Profile Test in Karimnagar
Connective Tissue Disease Profile in Karimnagar
Calcium Blood Test in Karimnagar
IHC in Karimnagar
Estriol Unconjugated (E3) Test in Karimnagar
Blood Typing in Karimnagar
Vitamin B12 Test in Karimnagar
Serum Cortisol in Karimnagar
Double Marker Test in Karimnagar
Pap Smear, Conventional in Karimnagar
Protein S Activity in Karimnagar
Non-Invasive Prenatal Testing (NIPT) in Karimnagar
whole exome sequencing in Karimnagar
Newborn Screening (NBS) in Karimnagar
Renal Function Test (RFT) in Karimnagar
