T 4

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 (T4) [thi-rok´sin]
a thyroid hormone that contains iodine and is a derivative of the amino acid tyrosine, occurring naturally as l-thyroxine; its chemical name is tetraiodothyronine. It is formed and stored in the thyroid follicles as thyroglobulin and released from the gland by the action of a proteolytic enzyme. It is deiodinated in peripheral tissues to form triiodothyronine (T3), which has a greater biological activity.

Thyroxine acts as a catalyst in the body and influences a great variety of effects, including metabolic rate (oxygen consumption); growth and development; metabolism of carbohydrates, fats, proteins, electrolytes, and water; vitamin requirements; reproduction; and resistance to infection. Pharmaceutical preparations of thyroxine, extracted from animals or made synthetically, are called levothyroxine.
free thyroxine the fraction of thyroxine in the serum that is not bound to a binding protein.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

Thyroxine (T 4 )

Thyroid hormone that regulates many essential body processes.
Mentioned in: Hypothyroidism
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

Patient discussion about T 4

Q. i've been having a neckache 4 2 wks what could be causing it?

A. Have you tried changing the way that you sleep?

Q. i am a size 12 and i need to get down to a size 4 fast how do i do it??

A. you are 15- try not to develop an eating disorder..i'm not sure that size 12 is considered overweight for age 15.. (depends on height and some other things) but size 4 is extremely thin for a 15 years old. i mean- an anorexic skeleton. that's not even the least attractive, if that is what you want to accomplish. loosing weight "fast" is always- ALWAYS!! a bad idea. it should be done moderately so your body will have the time to adjust, unless you look for severe health problems.

Q. what could cause leg pains in a 4 yr old?

A. It depends on many factors. Was there any trauma to the leg? In that case the pain may result from fracture or damage to the joint.

Is there any swollen/red/painful joint? In that case the pain may result from inflammation of the joint. Prompt referral to medical treatment is essential since in that case, early treatment may make the save the joint.

Does he have any rash on his legs? Elsewhere on his or her body? Rash with pain in the joint may be due to rheumatologic diseases such as rheumatic fever, henoch-shonlein purpura and many others.

The causes are numerous, and I wrote only a fraction of them. Not to mention the fact that it's practically impossible to diagnose people over the net. Pediatrician is the address in this case.

Take care,

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