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Lab Test Dictionary

Guanidinoacetic Acid and Creatine

Specimen Type

Plasma or Urine

Performing Lab

Kennedy Krieger Biochemical Genetics (KKI)

Epic ID

Other Reference Test

Lab Test Days

Mondays and Thursdays

Standard TAT

3-5 Days

Collection Information

Specimen Required

2-4 mL Blood collected in an EDTA (lavender-top) tube or 2-4 mL Fasting Random Urine in a sterile container

Collection Instructions

Plasma collected in a sodium heparin (green-top) or lithium heparin (green-top) tube is also acceptable.

Processing Information - Lab Use Only

Transport Temperature


Test Volume Required

2 mL Plasma or 4 mL Fasting Random Urine

Minimum Test Volume

1 mL Plasma or 2 mL Fasting Random Urine

Processing Instructions

Complete a Kennedy Krieger Biochemical Genetics requisition and submit with specimen frozen Monday-Thursday only, no weekends or holidays.


Ok to send on inpatients and outpatients.

CPT Codes