dgrhoads.com INR Table

---

The International Normalized Ratio (INR) was introduced by the World Health Organization (WHO) in 1983 to provide common basis for the interpretation of PT results independent of the sensitivity of the thromboplastin reagent used. Commercial thromboplastin reagents are calibrated against the International Reference Preperation (IRP); this calibration yields a value called the International Sensitivity Index (ISI). To calculate the INR, a normal patient or control value must be know

           

The calculator below prints a one-page chart of INR values for measured PT ranging from 9.0 to 40.9.

• Enter the ISI and Normal Value in the input cells at the top (from the thromboplastin package insert). Normal Value must be greater than zero. ISI is something in the general vicinity of 1.00.
• You can also enter a Method and Lot number for documentation.
• Be sure to TAB after entering each field. That makes the INR table on the screen recalculate.
• Click the Print button to print the table. The only thing that prints is the part below the blue line, so it should fit on one page.

   Go back to previous page.