Patent ID: 7459276

Claim:
A parathyroid hormone (PTH) assay control, comprising a composition having a known concentration of a whole PTH component mixed with a known concentration of a PTH fragment component, comprising: a) a whole PTH component having an amino acid sequence set forth in SEQ ID NO:1 (PTH 1-84 ), wherein the N-terminal amino acid residue of the PTH molecule must be intact; and b) a PTH fragment component having an amino acid sequence set forth in SEQ ID NO:1 (PTH 1-84 ), wherein the N-terminal amino acid residue of the PTH fragment starts at any position spanning position 2 through position 33 of the PTH 1-84 , the C-terminal amino acid residue of the PTH fragment ends at any position spanning position 35 through position 84 of the PTH 1-84 ; and the PTH fragment has a minimal length of four amino acid residues; wherein the ratio of the whole PTH component to the PTH fragment component ranges between about 1% to about 99%, wherein said composition further comprises a protein matrix base, and wherein said assay control is lyophilized.