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Test Code PSYR Psychosine, Whole Blood

Shipping Instructions

Must be sent refrigerated.

Necessary Information

1. Patient’s age is required.

2. Date of hematopoietic stem cell transplantation (HSCT), if performed.

Specimen Required

Collection Container/Tube:

Preferred: Lavender top (EDTA)

Acceptable: Green top (sodium heparin, lithium heparin)or yellow top (ACD)

Specimen Volume: 2 mL

Useful For

Aiding in the biochemical diagnosis of Krabbe disease using whole blood specimens


Follow-up of individuals affected with Krabbe disease


Follow-up testing after an abnormal newborn screening result for Krabbe disease


Monitoring of individuals at risk to develop late onset Krabbe disease


Monitoring of individuals with Krabbe disease after hematopoietic stem cell transplantation

Method Name

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

Reporting Name

Psychosine, RBC

Specimen Type

Whole blood

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Whole blood Refrigerated 7 days

Reference Values

Normal <10 pmol/g Hb

Day(s) and Time(s) Performed

Tuesday, Thursday; 8 a.m.

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
PSYR Psychosine, RBC 93687-2


Result ID Test Result Name Result LOINC Value
606152 Interpretation (PSYR) 59462-2
606145 Psychosine, RBC 93687-2
606151 Reviewed By 18771-6