The concentration of thrombin may be expressed in different units.
Units used to express thrombin include:
(1) NIH unit
(2) WHO unit
(3) USP unit
(4) Iowa unit
(5) microgram
|
Unit term
|
Number of NIH Units
|
|
1 WHO unit
|
0.56
|
|
1 USP unit
|
1
|
|
1 Iowa unit
|
0.83
|
|
1 microgram
|
3.086
|
|
1 NIH unit
|
|
1.7857 WHO units
|
|
1 USP unit
|
|
1.2048 Iowa unit
|
|
0.324 microgram +/- 0.073
|
