TSH (Thyroid) Level

TSH is the pituitary’s signal telling the thyroid to work harder. When the thyroid is underactive the pituitary shouts louder and TSH rises; when the thyroid is overactive, TSH drops instead.

Your numbers

TSH (mIU/L)(mIU/L)

Result

TSH (mIU/L)

2.5mIU/L

What it means

Within the normal range (0.4–4.0).

Formula

Result = band(TSH (mIU/L))

The normal range differs during pregnancy. This result alone does not diagnose thyroid disease.

What to enter

Input	Default	Accepted range
TSH (mIU/L) (mIU/L)The pituitary signal telling the thyroid to work harder; it rises when the thyroid is underactive.	2.5	0 ~ 100

Step by step

FormulaResult = band(TSH (mIU/L))

With the default numbersResult = band(2.5)

AnswerResult = 1

Quick reference table

Results when only TSH (mIU/L) (mIU/L) changes and everything else stays put.

TSH (mIU/L) (mIU/L)	Result	TSH (mIU/L) (mIU/L)
1.25	1	1.25
1.88	1	1.88
2.5	1	2.5
3.75	1	3.75
5	2	5

What each result means

Result	At default values
ResultWhat the formula gives back — the answer this page is for.	1
TSH (mIU/L) (mIU/L)The pituitary signal telling the thyroid to work harder; it rises when the thyroid is underactive.	2.5

Common mistakes

The normal range differs during pregnancy. This result alone does not diagnose thyroid disease.

Glossary

TSH (mIU/L): The pituitary signal telling the thyroid to work harder; it rises when the thyroid is underactive.
Result: What the formula gives back — the answer this page is for.

Frequently asked questions

QHow is TSH (Thyroid) Level calculated?

Result = band(TSH (mIU/L)) — TSH is the pituitary’s signal telling the thyroid to work harder. When the thyroid is underactive the pituitary shouts louder and TSH rises; when the thyroid is overactive, TSH drops instead.

QCan you walk through an example?

With TSH (mIU/L) 2.5mIU/L, the answer is Result 1.

QWhat do I need to enter?

Enter TSH (mIU/L). The result recalculates as you type, and an empty box counts as zero.

QHow much does the answer move if I change a number?

Changing only TSH (mIU/L) (mIU/L) moves the answer to TSH (mIU/L) (mIU/L) 1.25 → Result 1 and TSH (mIU/L) (mIU/L) 5 → Result 2. The table below lays out five steps.

QHow are the numbers rounded?

Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.

QAnything to watch out for?

The normal range differs during pregnancy. This result alone does not diagnose thyroid disease.

Related calculators

Mean Arterial PressureGet MAP and pulse pressure from systolic and diastolic readings.Pulse PressureThe gap between your systolic and diastolic readings.Cholesterol RatioTotal cholesterol divided by HDL — a cardiovascular risk marker.LDL Cholesterol (Friedewald)Calculate LDL from the three numbers on your lipid panel.

These calculators help you understand health figures; they do not replace diagnosis or prescription. See a clinician if you have symptoms.