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Test ID SSCTU S-Sulfocysteine Panel, Urine

Ordering Guidance

This is the recommended test when clinical features are suggestive of, or when molecular testing results suggest, molybdenum cofactor deficiency, isolated sulfite oxidase deficiency, and hereditary xanthinuria. This test includes measurement of relevant purines in addition to urine S-sulfocysteine and uric acid. If the clinical features are suggestive of a purine and pyrimidine metabolism disorder or are nonspecific, order PUPYU / Purine and Pyrimidines Panel, Random, Urine.

  This test will be canceled if ordered with PUPYU.

Necessary Information

Patient's age is required.

Specimen Required

Supplies: Urine Tubes, 10 mL (T068)

Container/Tube: Plastic, 10-mL urine tube

Specimen Volume: 3 mL

Collection Instructions: Collect a random urine specimen.

Useful For

Diagnosis of molybdenum cofactor deficiency, isolated sulfite oxidase deficiency, and hereditary xanthinuria


Monitoring patients with molybdenum cofactor deficiency or isolated sulfite oxidase deficiency who are on treatment

Method Name

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

Reporting Name

S-Sulfocysteine Panel, U

Specimen Type


Specimen Minimum Volume

2 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Frozen 90 days

Reference Values


0-3 years

4-6 years

7-12 years

13-18 years

>18 years













Uric Acid













All results reported as mmol/mol creatinine

Day(s) Performed

Tuesday, Thursday

Report Available

3 to 7 days

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 US Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
SSCTU S-Sulfocysteine Panel, U 94397-7


Result ID Test Result Name Result LOINC Value
607007 Interpretation (SSCTU) 59462-2
607002 Hypoxanthine 38366-1
607003 Xanthine 38371-1
607004 Uric Acid 34385-5
607005 S-Sulfocysteine 33876-4
607006 Reviewed By 18771-6