Click here if you are in a crisis
If you are here because your horse is laminitic please join the ECIR Group outreach at for immediate help from senior volunteers. It's free.

Click here to go to the ECIR Group outreach   Close

Equine Cushing’s and Insulin Resistance Group Inc.

EMS Calculator

Enter blood results in the boxes below, then click the "calculate" button for results.
Insulin Value
Insulin Unit of Measure
Insulin Convert
Glucose Value
Glucose Unit of Measure
Glucose Convert

EMS Calculations
G/I Ratio
RISQI Calculaton
MIRG Calculation
G/I Interpretation
RISQI Interpretation
MIRG Interpretation


  1. Insulin and glucose are strongly influenced by diet, time of feeding and exercise.
  2. The interpretations of results from this calculator are only valid for animals fed nothing but hay or pasture from the night before testing through the time of testing, with hay available at all times. If the horse runs out of hay overnight, wait to test until at least 4 hours after hay was provided again. 
  3. No exercise on the day of testing, including vigorous exercise on turnout.
  4. Some labs report insulin as mU/L which is equivalent to uIU/mL.
  5. EMS can be diagnosed from insulin alone (RISQI), but it is helpful to know glucose to make sure the horse is not in the diabetic range.
  6. MIRG > 5.6 indicates EMS even when the G/I ratio does not.


  • Treiber KH, Kronfeld DS, Hess TM, Boston RC, Harris PA. Use of proxies and reference quintiles obtained from minimal model analysis for determination of insulin sensitivity and pancreatic beta-cell responsiveness in horses AJVR, Vol 66, No. 12, December 2005.