How many meq of sodium would raise blood level from 139 to 144?

If would depend on body weight, more importantly you volume of body water. Both levels are within normal limits and there is medical reason to making the change. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs.

Serum sodium depends on water balance not the sodium intake. This is a common error for lay people as well as certain medical practitioner. The right question will be how much water a person has lost for sodium increasing from 139 to 144. Water intake or depletion is the primary cause of change in serum sodium. So if you eat extra salt, your body with retain water in order to maintain a normal Na.