PTH Ratio

CERNER / EPIC MNEMONIC: PTH RATIO
CPT CODE: 83970-90 (x2)
TEST INFORMATION: Test includes PTH-Total, PTH-CAP, CIP value, CAP/CIP Ratio
TURNAROUND TIME: 7-10 days
CONTAINER TYPE:

Lavender top tube

COLLECTION:

Fasting. For dialysis patients, before dialysis preferred.

SPECIMEN REQUIREMENTS: 4.0 mL EDTA whole blood (2.0 mL EDTA plasma)
REFERENCE RANGE:

PTH, Total: 14.0-66.0 pg/ml

PTH, CAP: 5.0-39.0 pg/ml

CIP Value: 2.5-29.0 pg/ml

CAP/CIP Ratio: 1.1-6.9

METHODOLOGY: Immunoradiometric assay (IRMA)
REFERRAL LABORATORY: Scantibodies Clinical Laboratory
ADDITIONAL INFORMATION: Total Intact PTH is the sum of CAP PTH and N-truncated PTH fragment (likely 7-84). CAP PTH is a true biologically active PTH (1-84). Whole PTH is cyclase activating PTH. CIP is the N-truncated PTH fragment, likely PTH (7-84). The CIP value is obtained by calculation only.