What does thyroxine total blood test tells a doctor about the patient?

Not much. Thyroid hormones like thyroxine float around partly bound to proteins and partly "free". Only the free portion is active. In someone with a normal thyroid, the more protein that is present, the more thyroxine gets stuck, the more thyroxine produced so that the free portion stays normal. So the total goes up, but the free thyroxine is normal. Pregnancy and birth control can make the protein go up.
Total thyroxine. By itself, total thyroxine is not very useful. As with any other lab value, total thyroxine level must be correlated with clinical findings. Tsh and free T4 may be more helpful if you are suspecting hypothyroidism for example.

Related Questions

Hi doctors. My aunt had her blood test done. Her thyroxine is 14.92, hymoglobin is little high and RBC is 4.92.she used to have headaches.

Let her ask the Ques. It looks like she already has a doctor who can address your/her concerns. her Thyroxine level is a bit high, so her dose of medication(Thyroxine/Synthroid) may need to be reduced. But that is the job of her treating doctor. Her RBC number is fine.. For Headaches, if these are frequent, she may need to see a headache specialist(Neurologist). Read more...

I've been told if my thyroxine levels are high or low from my blood test then I can't have my rhinoplasty done, can my doctor not give consent anyway?

Thyroid first. If you have an abnormality of thyroid function, that needs to be addressed anyway. Not treating the thyroid abnormality would increase the risk of surgery. It is not for your doctor to give consent. You have to give consent but the doctor performing the surgery may decline if there is unnecessary risk due to thyroid abnormality. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex. Get HPV vaccine. Read more...

I was on Synthroid (thyroxine) for over 10 years. Internal med. Doc. Prescribed before blood test suggesting I had hypothroid? Last yr. Started having fatique,

Hypothyroid? See pcp or internist to have thyroid evaluated physically as well as via blood tests, which can show whether thyroid is underactive & needs higher med dose or whether other problem is at work. Fatigue can be caused by many things: poor sleep, heart problems, thyroid, work shift changes, anemia, etc. Let doc check you out. Read more...

I was pregnant fr 7 week (now had miscarriage) nd I took a blood test. TSH 3rd gen level is 26.28. what type of thyroid is that. Am taking thyrox-100 thyroxine sodium tablets IP as suggested by doctor.

Se below. All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, your TSH level suggests that an upward revision in your medication dose is warranted and you should discuss it with your doctor. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex. Get HPV vaccine. Read more...

What does prealbumin blood test results tell a doctor about a patient?

Transthyretin. The new name is transthyretin. In short, due to its short half life, it can guide a doc as to the nutritional status of a patient more accurately than albumin. However, it has many other roles in the body and but most docs use it to determine nutritional status! Read more...

Curious: currently on 100mg of levothyroxine. Shouldn't I be on this indefinitely w/o stopping? Doc stopped my med after 1 mth blood test, why?

Can't imagine! Hi. I can't imagine why your doc would stop levothyroxine after only 4 weeks of therapy. Ask your doc. He/she will have data we don't have available. Still, I can't imagine what sort of data or hypothesis prompted that move. Good luck! Read more...

What type of blood test do doctors do for new patients?

No single answer! Of course this varies according to the situation, but i often get a blood count (cbc); a comprehensive metabolic panel to assess blood sugar, kidney and liver function; thyroid (tsh); and vitamin d. I offer HIV and herpes tests and other std screens. In some circumstances, we get a fasting cholesterol panel, and/or a hemoglobin alc to evaluate blood sugar over the prior three months. Lgromkomd. Read more...

How does a doctor determine whether a patient has more than 20% myeloblasts: is it done by examining spinal fluid or can a blood test easily det

Below. The myeloblast is a unipotent stem cell, which will differentiate into one of the effectors of the granulocyte series. The stimulation by G-CSF and other cytokines triggers maturation, differentiation, proliferation and cell survival. It is found in the bone marrow,not normally found in peripheral blood Under certain conditions it is found in the blood. Read more...
Where? This is of course the leukemia / myelodysplasia workup. Most often the burning question is whether there's 20% or more in the marrow. If they're in the blood, we already know. Percentage in spinal fluid -- you need spinal fluid. I'm glad you're interested in your workup and I trust you'll have a productive discussion with your physician. Best wishes. Read more...