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HelpTest Code SAU Sialic Acid, Free and Total, Random, Urine
Ordering Guidance
This is a recommended screening test for patients suspected to have a diagnosis of free sialic acid storage disease.
Urine oligosaccharides are also recommended for patients with a suspected diagnosis of sialidosis or galactosialidosis.
Necessary Information
Patient's age is required.
Specimen Required
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Container/Tube: Plastic, 5-mL urine tube
Specimen Volume: 1 mL
Pediatric Volume: 0.5 mL
Collection Instructions: Collect a random urine specimen (early morning preferred).
Forms
1. Biochemical Genetics Patient Information (T602)
2. If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.
Useful For
Screening for sialic acid disorders
Genetics Test Information
This is a screening test to detect patients with sialic acid disorders such as free sialic acid storage disorder, sialidosis and galactosialidosis.
Quantitation of free and total sialic acid and the ratio of these are provided.
Disease States
- Sialidosis
- Galactosialidosis
Special Instructions
Reporting Name
Sialic Acid, Free and Total, USpecimen Type
UrineSpecimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 90 days | |
| Frozen | 90 days |
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Reference Values
Free Sialic Acid:
≤4 weeks: ≤208 mmol/mol creatinine
5 weeks-12 months: ≤104 mmol/mol creatinine
13 months-18 years: ≤100 mmol/mol creatinine
≥19 years: ≤38 mmol/mol creatinine
Total Sialic Acid
≤4 weeks: ≤852 mmol/mol creatinine
5 weeks-12 months: ≤656 mmol/mol creatinine
13 months-18 years: ≤335 mmol/mol creatinine
≥19 years: ≤262 mmol/mol creatinine
Total/Free Ratio:
≤4 weeks: 1.94-18.68
5 weeks-12 months: 2.34-13.85
13 months-18 years: 2.63-9.18
≥19 years: 3.35-15.81
An interpretive report will also be provided.
Day(s) Performed
Friday
Report Available
5 to 11 daysSpecimen Retention Time
1 monthPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
84275
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| SAU | Sialic Acid, Free and Total, U | 104657-2 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 621069 | Free Sialic Acid | 104658-0 |
| 621070 | Total Sialic Acid | 104659-8 |
| 621071 | Total/Free Sialic Acid Ratio | 104660-6 |
| 621072 | Interpretation | 94423-1 |
| 621073 | Reviewed By | 18771-6 |