Reference values of parathyroid hormone in very low birth weight infants.

The physiological range for PTH levels for preterm neonates without 25(OH)D deficiency was estimated as 0.9 - 11.9 pmol/l (8.5 - 112.3 pg/ml). It seems that elevation of serum PTH above this range can be considered as hyperparathyroidism in very low birth weight infant.