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Parathormone, Body fluid (FNA)
(Not a routinely available test. See 'Additional information')

Item Value
Approval req'd? No
Available Stat? No
Test code PTHB
Test group Parathormone
Performed by China Basin Chemistry
In House Availability Monday, Wednesday, Friday day shift only
Method Chemiluminescent Immunoassay (Siemens Immulite 2000)
Collection Instructions Submit each FNA sample suspended in 0.5 mL (10 drops) of saline in a sterile tube. Each sample should be labeled with an identifier and the same information listed below to allow for proper identification of sample(s) on lab reports.

Deliver immediately to laboratory
Container type Sterile tube (see collection instructions)
Amount to Collect 0.5 mL (see collection instructions)
Sample type FNA fluid or tissue aspirate
Preferred volume 0.5 mL fluid
Min. Volume 0.5 mL fluid
Processing notes Centrifuge sample in refrigerated centrifuge and freeze in original tube at -20C.
Units ng/L
Normal range
Synonyms PTH FNA; Parathyroid hormone
Stability Room temperature 2 hours, refrigerated unacceptable, frozen at -20C 1 week.
Turn around times 1-3 days
Additional information As normal samples are not available for validating the performance of this assay, the UCSF Clinical laboratory makes no claims with regard to the accuracy of the result.

All results will be appended with a disclaimer: "The reference range and other method performance specifications have not been established by the UCSF Clinical Laboratory for this body fluid. The test result must be integrated into the clinical context for interpretation."

Assay for intact PTH in "neck" or "thyroid" cytology aspirates may be helpful in determining presence of inadvertently sampled parathyroid adenoma tissue. In aspirate samples of parathyroid adenomas, the ratio of PTH in the aspirate samples versus in serum is typically > 3 even without accounting for dilution of the aspirate sample (Owens CL et al. Diagnostic Cytopathology 26:227-231, 2008).
CPT coding 83970
Last Updated 6/21/2016 14:12:34
Entry Number 1177
Lab Procedure Link Click here for procedure
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