Fasting Required: Yes 10-12 Hours Specimen: Blood Results: 2-3 Business Days Description: Insulin is the hormone that enables cells to take in glucose. Without insulin, glucose can't get into the cells and it stays in the bloodstream. With too little insulin, blood sugar remains higher than normal (a condition known as hyperglycemia) and cells can't get the energy they need. With too much insulin, blood sugar decreases (hypoglycemia), causing symptoms such as sweating, trembling, lightheadedness, and in extreme cases, shock. Methodology Immunoassay (IA) Reference Range(s) 2.0-19.6 µIU/mL Clinical Significance For diagnosis and monitoring of diabetes and insulin-secreting tumors.