Erythrocyte Porphyrin (EP)
Label Mnemonic: FEP
Epic Lab Code: LAB942
Downtime Form: A-1a Miscellaneous Request
Commercial Mail-out Laboratory
5231 RCP
356-8593
Specimen(s):
Whole Blood
Specimen Instructions:
Protect from light during collection, storage, and shipment.
Collection Medium:
Lavender top tube 3 mL (EDTA)
Minimum:
Recommended Minimum: 1.0 mL whole blood
Absolute Minimum: 0.5 mL whole blood
Rejection Criteria:
Specimens not collected in EDTA. Clotted specimens.
Delivery Instructions:
Wrap specimen in aluminum foil to protect from light.
Turn Around Time:
1-4 days upon receipt at reference laboratory
Reference Range:
0-35 μg/dL
Test Limitations:
Elevated Erythrocyte Porphyrin (EP) results are seen in early and late iron deficiency, in the anemia of chronic disease, and in chronic lead poisoning (typically when blood lead is greater than 25 Elevated protoporphyrin (as in erythropoietic protoporphyria) and zinc coproporphyrin (usually associated with childbirth) can increase the apparent EP signal.

Specimens which are hemolyzed, clotted, or improperly aliquoted may show false elevations.
Methodology:
Fluorometry
CPT Code:
84202