to determine whether the increases in serum ipth might be the result of increased renal retention of inactive pth fragments rather than stimulation of parathyroid function , we measured plasma intact pth by immunoradiometric assay and estimated parathyroid size by ultrasonography in men who had received short term ( less than 6 months ) or long term ( greater than 3 yr ) lithium treatment and in normal subjects .
C0229671
serum
C0032105
plasma