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Lab Test Dictionary

Hydroxyglutaric Acids, Glutaric Acid, Ethylmalonic Acid and Methylsuccinic Acid, Serum (HGEMS)


Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

Specimen Type


Performing Lab

Mayo Medical Lab

Epic ID

Other Reference Test

Lab Test Days

Monday and Wednesday; 8 A.M.

Standard TAT

2-10 Days

Collection Information

Specimen Required

1 mL Blood

Container Type

Red Top (No Additive)

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp: 4 Days; Refrigerated: 90 Days (Preferred); Frozen: 90 Days

Rejection Criteria

Serum separator tube (SST)

Test Volume Required

0.1 mL Serum

Minimum Test Volume

0.02 mL Serum

Processing Instructions

Order in Mayolink and send with Mayo courier Monday-Friday.

CPT Codes