What are the reference ranges for TSH?
What are the reference ranges for TSH?
TSH normal values are 0.5 to 5.0 mIU/L. Pregnancy, a history of thyroid cancer, history of pituitary gland disease, and older age are some situations when TSH is optimally maintained in different range as guided by an endocrinologist. FT4 normal values are 0.7 to 1.9ng/dL.
How do you set a reference range?
The lower reference limit would be the third number from the beginning (top) of the sorted list and the upper reference limit would be the third number from the (end) bottom. The reference range would be the central 95% of the data, which falls between the 3rd and 117th values.
How do you establish laboratory reference ranges?
Individual variability: References ranges are usually established by collecting results from a large population and determining from the data an expected average (mean) result and expected differences from that average (standard deviation).
What is normal range of TSH T3 and T4?
Generally, healthy TSH levels are an indicator the whole system is working well, but that’s an oversimplification at best. 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).
What is normal TSH level for age?
| Age | Free T4* (ng/dL) | TSH (mU/L) |
|---|---|---|
| 1 to 5 years | 0.8 to 1.8 | 0.7 to 6.6 |
| 6 to 10 years | 1.0 to 2.1 | 0.8 to 6.0 |
| 11 to 18 years | 0.8 to 1.9 | 0.6 to 5.8 |
| >18 years | 0.9 to 2.5 | 0.4 to 4.2 |
What is a normal reference range?
A reference range may also be called “normal values.” You may see something like this on your results: “normal: 77-99mg/dL” (milligrams per deciliter). Reference ranges are based on the normal test results of a large group of healthy people. The range helps show what a typical normal result looks like.
What do reference ranges mean?
Listen to pronunciation. (REH-frents raynj) In medicine, a set of values that a doctor uses to interpret a patient’s test results. The reference range for a given test is based on the results that are seen in 95% of the healthy population.
What is a reference interval in a lab test?
Definition of reference interval The reference interval for many laboratory tests is defined by threshold values between which the test results of a specified percentage (usually 95%) of apparently healthy individuals would fall.
Why are reference ranges different?
A reference range can vary between different laboratories when a collection of people who are considered ‘normal’ are used to establish a reference range for a given blood test. Complex mathematics are applied to allow for a natural variation within this chosen collection of people and therefore the reference range.
At what TSH level should hypothyroidism be treated?
If your TSH level is higher than 10 mIU/L, you should start treatment, because you will very likely develop symptoms of an underactive thyroid, even if you don’t have them now.
What is the ideal TSH level for a woman?
An optimal TSH level in a woman is 0.4-2.5 mIU/L. For pregnant women, that upper limit is stricter than if you are not pregnant. A dangerously high level of TSH is above 5.0 mIU/L. High TSH means low thyroid hormones.
How do you calculate reference value?
The common formula to calculate the reference range is: mean±1.96x SD.