What does mean plasma glucose of 119 mean?

Hello and welcome to e health forum.

The normal blood sugar after 12 hours of fasting should be below 100 mg/dl (As per the ADA recommendations). In your case this seems to be 86, and this is within the normal level.

The Random blood sugar (RBS) measures blood glucose regardless of when you last ate. The normal range should be between 70 - 125 mg /dl.

Prediabetes (or Impaired blood glucose) is considered when the fasting blood sugar (FBS) is in the range of 100 - 125 mg/dl.

Diabetes mellitus is considered when the FBS is above 126 mg/dl.

The best way to confirm the glucose control in the body is via the HBA1C test. A normal non-diabetic HbA1C is 3.5 - ‎‎5.5 %. In diabetes about ‎‎6.5% is good.‎ Above 7.0 diabetes is considered as uncontrolled.

You might consult with your doctor for proper counselling and advice.