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Lab Test Dictionary

Porphyrins, Fractionated, Quantitative and Porphobilinogen, 24 Hour Urine (17198)

Methodology

High Performance Liquid Chromatography (HPLC); Chromatography/Mass Spectrometry


Specimen Type

Urine, Timed Collection

Performing Lab

Quest Diagnostics San Juan Capistrano


Epic ID

LAB01312

Lab Test Days

Sunday, Tuesday-Friday

Standard TAT

5-7 Days


Collection Information

Specimen Required

2-4 mL 24 Hour Urine

Container Type

24-Hour Urine Container

Collection Instructions

24-hour urine, collection should be adjusted to a pH of 6-7 with 5 g sodium carbonate (Na2CO3). Add the sodium carbonate at the start of the collection. The urine should be refrigerated and protected from light during collection. Give specimen to Chemistry to measure total volume and Hematology to adjust pH with sodium carbonate (Na2CO3) stored in Hematology hood and supplied by Quest.


Processing Information - Lab Use Only

Transport Temperature

Refrigerate-OK/Frozen-OK

Specimen Stability

Room Temp: Unacceptable; Refrigerated: 7 Days; Frozen: 30 Days

Rejection Criteria

Received room temperature; Not protected from light; pH<4.0 (acidified urine)

Test Volume Required

4 mL 24 Hour Urine

Minimum Test Volume

2 mL 24 Hour Urine

Processing Instructions

24-hour urine, collection should be adjusted to a pH of 6-7 with 5 g sodium carbonate (Na2CO3). Add the sodium carbonate at the start of the collection. The urine should be refrigerated and protected from light during collection. Give specimen to Chemistry to measure total volume and Hematology to adjust pH with sodium carbonate (Na2CO3) stored in Hematology hood and supplied by Quest. Indicate total volume and collection duration in comments and on specimen.


Included Tests

Porphyrins, Fractionated, Quantitative, 24 Hour Urine (Coproporphyrin I, Coproporphyrin III, Heptacarboxyporphyrin, Hexacarboxyporphyrin, Pentacarboxyporphyrin, Total Porphyrins, Uroporphyrin I, Uroporhyrin III) and Porphobilinogen, Quantitative, 24 Hour Urine.


CPT Codes

84120, 84110


Revised

5/17/24

Initials

SA