Normal T4 and T3 Levels in Pregnancy. The cohort was followed for 6.3 ± 4.4 years. Free thyroxine is often more useful than total thyroxine (total T4) in assessing thyroid function, but total T4 can be a useful biomarker in some cases. Median TSH values ranged from 6.10 mIU/L (0.07 ng/mL; Alaskan Malamute and Golden Retriever) to 17.6 mIU/L (0.26 ng/mL; Collie). 0-5 days: 0.9-2.5 ng/dL. The normal range was 0.93‐1.7 ng/dL for FT4, 2.0‐4.4 pg/mL for FT3 and 0.25‐5.0 ulU/mL for TSH. The normal range for free T 4 in adults is 0.8 to 1.8 nanograms per deciliter (ng/dL). The suppressed TSH, and serum total T4 above the "normal range for pregnancy" (approximately 9-18 mg/dl, 120-240 nmol/L) are consistent with hyperthyroidism. Next: Interpretation. Hypothyroidism: T4 (thyroxine) levels will be low ; Newborns are screened using total T4 tests to detect hypothyroidism. If not, can she have thyroid in future based on these values. Free T4 (FT4, Free Thyroxin) ... Because of the normal feed-back loop, TSH rises whenever the thyroid gland fails to produce sufficient thyroid hormone. Estimation of anti-TPO-Ab was done using Elecsys 2010 Immunoassay autoanalyzer (Roche Diagnostics) by electrochemiluminescence immunoassay. There are also specific reference values for children. Optimal range: 0.7 –1.9 ng/dL Thyroxine, or T4, is one of the two important thyroid hormones. Normal ranges for adults generally fall between these values . Normal Range. The value lying outside this range leads to thyroid problems. Reference ranges for free thyroxine (FT4) are as follows: In children/adolescents: 0.8-2 ng/dL (10-26 pmol/L) In adults: 0.7-1.8 ng/dL (9-23 pmol/L) In pregnant patients: 0.5-1 ng/dL (6.5-13 pmol/L) Normal value ranges may vary among different laboratories. 2-12 Years 0.9-1.4 ng/dL. Melmed S, Polonsky KS, Larsen PR, et al: Williams textbook of Endocrinology. Serum FT4, FT3 and TSH level were measured by an electrochemiluminescent immunoassay (Roche, Tokyo, Japan) with a lower limit detection of 0.023 pg/dL, 0.26 pg/mL and 0.005 ulU/mL, respectively. 6-10 years: 1.0-1.7 ng/dL. May 17, 2019. So, values >35 IU/ml were considered positive. The normal range for free T4 in adults is 4.6 to 11.2 micrograms per deciliter (mcg/dL). Clinical laboratory units online conversion from conventional or traditional units to Si units. Normal blood levels of free thyroxin (FT4) range between 0.8 and 1.8 nanograms per deciliter (ng/dL). When a high blood level of T4 has been reported, then there is an overactive thyroid gland in the patient leading to hyperthyroidism. This means your thyroid is not making enough hormones. THYROID STIMULATING HORMONE (TSH) 6 days-2 months: 0.9-2.2 ng/dL. Talk to your provider about the meaning of your specific test results. For simplicity sake I only listed the reference ranges for adult females. Almost all of the T4 in the blood (99.97%) is bound to blood proteins, but only the unbound T4 is active. Some laboratories use different measurements or may test different specimens. Normal T4 Level . Your hypothalamus and pituitary glands control the release of T4. Mine is .04 - I was Also diagnosed with Hashimoto Thyroiditis. 0. It is elevated in hyperthyroidism and depressed in hypothyroidism. SI units Conversion Calculator. Free T4 1.0-3.0 ng/dL. 2 months ago, my TSH with reflex was 7.99. Clinical Reference . A heel stick is used to collect the blood. T4 4.6-12 ug/dl Free thyroxine fraction FT4F 0.03-0.005% Free Thyroxine FT4 0.7-1.9 ng/dl Thyroid hormone binding ratio THBR 0.9-1.1 Free Thyroxine index FT4I 4-11 Serum Triiodothyronine T3 80-180 ng/dl A high T4 result could mean you have hyperthyroidism. 0-5 days: 5.0-18.5 mcg/dL The free T4 test measures the tiny amount of circulating T4 that is unbound, active T4. Pearls: Half-life: 4 hours. Normal Ranges for Free T4: 1-23 Months 0.9-1.4 ng/dL. Elevations in FT4 cause hyperthyroidism, while decreases cause hypothyroidism. FT4 is available to the tissues and is, therefore, the metabolically active fraction. 3-11 months: 0.9-2.0 ng/dL. Normal value ranges may vary slightly among different laboratories. Canine samples containing T3 AA were compared to serum from three rabbits actively immunized against T3 to provide anti-T3 for commercial RIA. The thyroid gland releases T4 when it is stimulated by thyroid-stimulating hormone, also known as TSH or thyrotropin. For these test values does the patient has thyroid issues. Free T3 0.25-0.65 ng/dL. The normal range is more variable among laboratories than total T4; the typical range is 75 to 195 ng/dL (1.1 to 3 nmol/L). Thyroxine (T4) Unit Conversion between ng/dL and pmol/L. For the same reason, whenever there is too much thyroid hormone present in the serum, the brain responds by lowering the TSH. Yes, 0.9 ng/dL is considered normal, however, wouldn't it also be on the low end of normal? Thyroid hormones are vital to the growth and development of a fetus. FTI (Free Thyroxine Index, FTI, T7) The FTI is obtained by multiplying the (Total T4) times (T3 Uptake) to obtain an index. 1 This test may provide a better indication of T4 levels since it is not affected by binding proteins. 1.8 3. Curious. A low T4 test result is a sign of hypothyroidism. Normal Range: Total T4 (TT4) bound and free T4: 4.5 -11.5 ug/dL: Free T4 (FT4) free T4: 0.8 - 1.7 ng/dL (up to 2.7 ng/dL depending on the reference). 11-19 years: 1.0-1.6 ng/dL. Women with thyroid nodules also had higher free T 4 levels, but only in the first trimester (1.08 ng/dL) compared with women without nodules (1.03 ng/dL; P < .001). Normal range was 0–35 IU/ml. 1 Serum Free T4 concentration: This measures T4 unbound to proteins; a low free T4 will indicate hypothyroidism, while a high free T4 will indicate hyperthyroidism. Researchers divided the reference range of fT4 into quartiles (Q): Q1, 0.75 to 0.90 ng/dL; Q2, 0.91 to 1.01 ng/dL; Q3, 1.02 to 1.14 ng/dL; Q4, 1.15 to 1.50 ng/dL. Free T4 is the most accurate assessment of thyroid hormone levels, because it avoids changes in plasma protein binding capabilities. High T4 Level . A 31-year-old female asked: Thyroid ultrasound results showed hyperthyroidism but blood tests came back saying hypothyroidism TSH 11.4 antibodies teat also came back high? FRT4 : Free thyroxine (FT4) comprises a small fraction of total thyroxine. 2 doctor answers • 2 doctors weighed in. The range of mean concentration of T4 (19.7 nmol/L [1.53 µg/dL] in English Setters to 29.0 nmol/L [2.25 µg/dL] in Keeshonds) and FT4 (12.6 pmol/L [0.98 ng/dL] in English Setters to 20.2 pmol/L [1.57 ng/dL] in Samoyeds) was considerable. 0.8. Definition of euthyroid was normal ranges of FT4, FT3 and TSH concentration. Normal Ranges for Total T4: Adults: 4.5-111.7mcg/dL. If it's 0.9 ng/dL, it's normal. SI conversion: pmol/L = 12.9 x ng/dL. For example, according to Quest Diagnostics, the lab reference range for free T4 for those 2 to 12 years in age is 0.9-1.4 ng/dL, but those people over 20 years old should have a reference range between 0.8-1.8 ng/dL. After three months, there was a fall in TSH to 12.74 μIU/ml, however, with unexpectedly high free T4 (FT4) - 6.8 ng/ml and free T3 (FT3) - 6.7 pg/ml concentrations [reference range (rr): 0.8-1.9 ng/ml and 1.5-4.1 pg/ml (Siemens®), respectively]. In most cases, free thyroxine (also known as free T4) is good indicator of thyroid function, along with TSH and other measures. Normal Values* Total T4. NORMAL ng/dL. Typical results in adults for the free T4 test generally range from 0.8 to 1.8 nanograms per deciliter (ng/dL). Dr. Muhammad Bader Hammami on Medscape says that total T4 (TT4) range and free T4 (FT4) range are as follows: 10. Abnormally low free T 4 levels may signal hypothyroidism. My clinical reports are as follows: Test value in Aug 08 value in Feb 09 FT3 1.87pg/ml 2.87 pg/ml FT4 1.45 ng/dl 1.45 ng/dl TSH 2.33 uIU/ml 2.43 uIU/ml T3 65 ng/dl 64 ng/dl T4 2.0 ug/dl 1.8 ug/dl My doctor said that since Ft3 and FT4 are in range hence no issues and not suggested any medicine in August 2008. A normal T4 test result means your thyroid gland works like it should. The resin T3 uptake value is not reduced as it should be in pregnancy, and confirms that the suppressed … Free thyroxine is often more useful than total thyroxine in assessing thyroid function. It is elevated in hyperthyroidism and depressed in hypothyroidism. In dogs with normal total T4 concentrations the average calculated T3 not bound by T3 AA was 147.2 +/- 144.4 ng/dl while in dogs with low total T4 the value was 15.7 +/- 26.3 ng/dl (normal canine range is 45-150 ng/dl). A normal T3 level might be somewhere between 100 to 200 nanograms per deciliter (ng/dL), while a normal T4 level falls between 5.0 to 12.0 micrograms per deciliter (μg/dL). The normal range of free T4 (thyroxine) is 0.9 to 2.3 ng/dL, or 12 to 30 pmol/L. Table of conversion factors for Thyroxine (total T4) unit conversion to nmol/L, µg/dL, µg/100mL, µg%, ng/mL, µg/L. Conditions and circumstances associated with changes in thyroid … Tsh 1.38 uiu/ml, free T4 1.09 ng/dl, free T3 (liothyronine) 3.09 pg/ml 3.09 but have anti thyroglublulin of 0.65 iu/ml can I have a thyroid problem? Note: Fill in one box to get results in the other box by clicking "Calculate" button. Monitoring T4 and T3 levels in pregnant women is more complex. 6 -10 years: 6.0-13.8 mcg/dL. 11 -19 years: 5.9-13.2 mcg/dL T4 (THYROXINE), FREE. Lab Reference Range: 8-25 ng/dL When to order: - To initially screen for hyper or hypothyroidism - To monitor thyroid medication usage. Reference Range Uses Application ... Free T4: 0 - 4 days = 2 - 6 ng/dL (26 - 77 pmol/L) 2 weeks to 20 years = 0.8 - 2 ng/dL (10 - 26 pmol/L) Adult = 0.80 - 2.8 ng/dL (10 - 36 pmol/L) Indications & Uses. Total T4 5.0-12 μg/dL . 1-5 years: 1.0-1.8 ng/dL. A level of free T 4 that is higher than normal could mean you have an overactive thyroid. Aug 24, 2020. The normal ranges of serum hormone concentrations: FT3 = 1.2–4.4 pg/ml, FT4 = 0.8–2 ng/dl, and TSH = 0.5–5 mIU/L. Adult (≥20 years of age): 0.9-1.7 ng/dL. Nell. Total T3 80-190 ng/dL. A typical normal range is 0.9 to 2.3 nanograms per deciliter (ng/dL), or 12 to 30 picomoles per liter (pmol/L). Like total T4 in adults, free T4 also varies in children according to age. Low T4 Level . Conditions associated with hyperthyroidism include Graves disease, an autoimmune disorder. Convert Thyroxine (total T4) level to nmol/L, µg/dL, µg/100mL, µg%, ng/mL, µg/L. Of the total cohort, 7.4% of patients were below, 88.4% were within, and 4.2% were above the fT4 reference range. Data should be separated in … What's your unit? Adults: 80 – 220 ng/dL; Normal free T3 (FT3) range: Adults: 260 – 460 pg/dL (4 – 7.4 pmol/L) Normal T4 levels (Normal Free T4 Levels and Total T4) Testing for normal levels of T4 thyroid hormone is a common lab test along with TSH to diagnose thyroid issues. Free T3Your Value2.2 pg/mLStandard Range2.3 - 4.2 pg/mL T4 FreeYour Value1.18 ng/dLStandard Range0.76 - 1.46 ng/dL TSHYour Value0.62 mU/LStandard Range0.40 - 4.00 mU/L I know other people on this thread have had success with other treatments too... so I'm open to any suggestions. Free T4 .9 (normal range) have thyroid nodule, prolactinoma 1 doctor answer • 2 doctors weighed in Im 42 type2 diabates for 10 yrs (avg 180 sugar level), recent lab test shows high tsh:11.5 (range 0.3-4.2) but normal free t4: 19 (ref12-22), vit d 11.3 T3: 0.8 ng/ml, T4: 8.5 ug/dl, TSH: 1.35 uIU/ml. Your Thyroxine, Free (FT4) is . High or Low T4. The normal t4 level range in adults is 0.8 to 2.8 nanograms per deciliter (ng/dL). Free T4, which tests for the amount of T4 that is available in the body, should range between 0.8 to 1.8 nanograms per deciliter (ng/dL).