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Test Code LAB90416 Parathyroid Hormone (PTH), Intraoperative, Plasma

Additional Codes


Reporting Title

Intraoperative PTH



Used exclusively for patients in surgery for parathyroidectomy.

Performing Laboratory

OhioHealth Laboratory Services-RMH, GMC, DH, DMH Core Laboratories

Specimen Requirements

This test must be scheduled prior to surgery with RMH Special Testing Laboratory by calling 614-566-4755. Patient’s name and surgery date can be left on voice mail. Surgery should be scheduled for a.m. Usual protocol involves a preoperative specimen, a pre-excision specimen drawn when parathyroid is visualized, but prior to excision, and 1 or more post-excision specimen(s) drawn 10 minutes after excision. For each specimen, call RMH Special Testing Laboratory to let them know that specimen is en route. This speeds testing process and assures timely receipt of results.


Draw a full, lavender-top (EDTA) tube; and send EDTA whole blood. Avoid manipulations likely to cause hemolysis (eg, dispensing whole blood through a syringe needle into VACUTAINER®). Tube must be full; incomplete filling of tube results in falsely lowered results. Forward unprocessed whole blood promptly at ambient temperature only.

Note:  1. Lipemic specimen will have to be cleared prior to analysis.

2. Heterophile antibodies may interfere with this assay.

Specimen Transport Temperature

Ambient/Refrigerate NO/Frozen NO

Reference Values

A drop of 50% from the higher of the 2 pre-excision values (preoperative or pre-excision) indicates successful removal of the problem gland.

Note:  Bilirubin and hemolysis falsely lower results.

Day(s) Test Set Up

Monday through Friday

Test Classification and CPT Coding