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Test Mnemonic:


Specimen Requirements:

Whole blood (5 mL volume) or serum.  Plasma is also satisfactory.


Routine venipuncture.


Red top tube (no anticoagulant) or green top tube (heparinized).

Minimum Volume:

3.0 mL whole blood


Protect the sample from light and refrigerate or freeze.  See Shipping Instructionsfor more details. 

Specimen Preparation:

Centrifuge the whole blood and remove serum/plasma from red cells. Freeze and light protect until analyzed. 


Stable when light protected and refrigerated or frozen.

Causes for Rejection:

Samples not protected from light or not refrigerated or frozen will not be rejected, but their condition on arrival will be recorded in the results report.

Reference Range:

0 - 0.6 microgram/mL

Turnaround Time:

Routine; test is performed semi-weekly.


Spectrophotometry after separation by ion exchange chromatography and addition of Ehrlich reagent. 


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 77555-1109; Phone: (409) 772-9103 or 1803.


Porphyria Laboratory

Clinical Indication:

Screening test for acute porphyrias (e.g. AIP) in patients with advanced renal disease.  Less sensitive than urine porphobilinogen in patients with normal renal function. 

Patient Preparation :

Not applicable

CPT 4 Code:



Call the Porphyria Laboratory at (409) 772-4661 or (409) 772-9103 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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