T4
About This Test
T4 (thyroxine) is the main hormone produced by the thyroid gland and is converted in the body to the more active T3. It affects energy use, temperature, and growth. Abnormal levels point toward underactive or overactive thyroid and are interpreted with TSH (and sometimes FT4/FT3) for accuracy. This test is commonly included in routine thyroid evaluations to screen for potential problems early.
Patient Preparation
No fasting needed
Best Time to Test
Morning preferred, but can also be done anytime
Tests Included
T4
Why is it done
Work-up of fatigue, weight change, hair loss, menstrual changes, or mood shifts; diagnosis and monitoring of hypothyroidism or hyperthyroidism; dose-adjustment guidance for thyroid hormone replacement; clarification of abnormal TSH or symptoms suggestive of thyroid disease.
Home Sample Collection and Laboratory Analysis (Metro Manila, Philippines)
This is a laboratory test order with home sample collection and laboratory analysis. A licensed medical technologist visits your address in Metro Manila to collect the required sample using sterile, single-use collection materials. The specimen is then transported for processing at a partner laboratory, and the laboratory report is sent to your email once released.
Frequently Asked Questions
Do you offer home service in Metro Manila?
Yes. Klaro Health offers home sample collection across Metro Manila with free home visit for orders over ₱1,800, only ₱299 otherwise.
A licensed medical technologist visits your address at an agreed time to collect the required samples.
How do I book at home blood tests?
Choose your tests or package, add to cart, fill in patient details, select preferred time slot and pay online to book online in minutes. Next-day scheduling is usually available.
Do I need a doctor’s request?
If you have a lab order, you can also use our Upload Lab Request option and we’ll help you match and price the tests. You can place an order also without a lab request.
When will I receive my results?
Your sample is processed by a partner laboratory. Once released, the laboratory report is sent to your email. Results are released the next day for most tests.
Is fasting required?
It depends on the test. If fasting is needed, it will be stated on the product page under Patient Preparation.
Where do you offer at home blood testing?
We offer home service blood testing in Metro Manila, including Taguig (BGC), Makati, Quezon City, Manila, Pasig, Mandaluyong, San Juan, Marikina, Pasay, Parañaque, Las Piñas, Muntinlupa (Alabang), Caloocan, Valenzuela, Malabon, and Navotas.