My parathyroid hormone is very low. vitamin d, calcium and tsh are normal. does this matter?

Yes: Parathyroid hormone controls calcium metabolism and cause hypocalcemia.You have to periodically monitor blood calcium level.

No: I assume you have not had any surgery to remove parathyroids . How low was the level. And i would want to know what the vitamin d level was. Many labs report normal bit i consider 30 to be low for vitamin d. Increase vitamin d replacement by 2000 if it is 30 or less. Why were these levels checked ? Where you having problems ? What symptoms ?