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Lab Test Dictionary

Cystine (10947X)


Liquid Chromatography Mass Spectrometry

Specimen Type

Urine, Timed Collection

Performing Lab

Quest Diagnostics San Juan Capistrano

Epic ID


Lab Test Days

Tue Thu

Standard TAT


Collection Information

Container Type

24-Hour Urine Container

Processing Information - Lab Use Only

Transport Temperature

Ship frozen (Do not thaw)

Specimen Stability

Room Temp: Unacceptable , Refrig: Unacceptable , F

Rejection Criteria

Thawed 24-hour urine, pH <2.0, IVP within 48 hours

Test Volume Required

1.8 mL

Minimum Test Volume

0.4 mL

Processing Instructions

Do not use preservatives. Urine with a pH less than 2.0 will be rejected. Keep collection container refrigerated during 24-hour collection. Start collection after first morning void. Collect through first morning void of the next day. Take collection to the laboratory ASAP on the second day. The laboratory will mix sample well, measure total volume and remove an aliquot to send for testing. Freeze aliquot immediately.

CPT Codes