Thyroid

TSH receptor antibodies (TRAb) unit converter

Antibodies against the TSH receptor (Graves disease)

Also known as: TRAb, TRAK, TSH-R-Ak, Thyrotropin receptor antibodies

Converter

Enter a value in any unit and all other units fill in.

IU/L = mIU/mL

Conversion formulas

Equivalent notations	IU/L = mIU/mL	1 : 1

Good to know

TSH receptor antibodies are reported in IU/L or in mIU/mL, which are numerically identical.

1 IU/L = 1 mIU/mL.
The cut-off differs between assays (for example 1.75 or 1.8 IU/L).

Reference range

Unit	Adults
IU/L = mIU/mL	0 – 1.8

Source: Newcastle Hospitals Laboratories: TSH Receptor Antibodies · Last reviewed: 2026-10-19

Note from the source: Results above 1.8 U/L (read here as IU/L) are positive (Newcastle Hospitals Laboratories); the cut-off differs between assays

Frequently asked questions

What is the reference range of TSH receptor antibodies (TRAb)?

For adults the range is 0 – 1.8 IU/L (Newcastle Hospitals Laboratories: TSH Receptor Antibodies). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for TSH receptor antibodies (TRAb)?

Common units are IU/L.