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PORPHYRINS, plasma (087-7408)
Test Mnemonic:


Specimen Requirements:

Centrifuge the whole blood specimen, remove plasma from red cells, protect plasma from light, and refrigerate or freeze.   Required Volume: 5 mL.

Test Included:

Fluorescence scan of diluted plasma at neutral pH. 


Routine venipuncture.


Green top tube (heparin).

Minimum Volume:

0.5 mL


Centrifuge the whole blood, remove plasma, protect plasma from light, and refrigerate.  See Shipping Instructions.

Specimen Preparation:

Whole blood or plasma


Stable when light protected and refrigerated or frozen.

Causes for Rejection:

Sample hemolyzed or contaminated with red cells, not light protected or not refrigerated or frozen will not be rejected, but their condition will be recorded in the results report.

Reference Range:

0 - 0.9 micrograms/mL.  Flourescence scan is interpreted qualitatively based on peak wavelength. 


Turnaround Time:

Routine; test is performed weekly.


Excraction and fluorometry. 


Test performed weekly; Samples are accepted 24 hours per day at Sample Management, 7.412 CSW or from 8 AM - 5 PM, Monday - Friday at Room 3.102, Ewing Hall, Galveston, TX 77555, Phone: (409) 772-9103 or 4661.


Porphyria Laboratory


Serum porphyrins (equivalent results) 

Clinical Indication:

First line test for screening for blistering cutaneous porphyrias (e.g., PCT) and (with fluorescence scan) to differentiate variegate porphyria from other porphyrias.

CPT 4 Code:



Call Porphyria Laboratory at (409) 772-9103 or 4661 if any questions.

When ordering tests for which Medicare or Medicaid reimbursement will be sought, physicians should only order tests that are medically necessary for the diagnosis or treatment of the patient. Components of the organ or disease panels may be ordered individually. The diagnostic information must substantiate all tests ordered and must be in the form of an ICD-10 code or its verbal equivalent.
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