I had some blood done, my b12 results were 572 which was in the standard range, but my folate, (folic acid) serum result was 15.70. should i be concerned?

That is normal: The Folic Acid level is normal.

See your doctor: To discuss your concerns. That would be a normal value for an adult in my lab. Normal range is usually posted as : •adults: 2-20 ng/ml, or 4.5-45.3 nmol/l •children: 5-21 ng/ml, or 11.3-47.6 nmol/l •infants: 14-51 ng/ml, or 31.7-115.5 nmol/l for plasma folate (folic acid) levels.