Update Summary
| Effective Date | Update Type | Name | |
|---|---|---|---|
| 06/30/2026 | Inactivated/Replace Test | CYSTC – “Cystatin C, Serum” replaced by CYST – “Cystatin C with eGFR” | Jump to update |
CYSTC – “Cystatin C, Serum” replaced by CYST – “Cystatin C with eGFR”
Inactivated Test Details
Mnemonic
CYSTC
Ordering Code
3688340
CPT-4 Codes(s)
82610
Replacement Test Details
Mnemonic
CYST
Ordering Code
3000979
CPT-4 Codes(s)
82610
Turnaround Time
1 - 3 days
Performed
Sunday - Thursday
Legacy Code
CYST
Example Report
Specimen Information
Collect
Serum separator tube (SST)
Specimen Preparation
Centrifuge, separate serum from cells and send 1.0 mL serum refrigerated in a screw capped plastic vial.
Alternate Specimen
Plasma: Green sodium or lithium heparin
Serum: Red top
Serum: Red top
Minimum Volume
0.5 mL
Transport Temperature
Refrigerated
Rejection Criteria
Grossly lipemic samples.
Stability
Room temperature: Undetermined
Refrigerated: 7 days
Frozen: 3 months
Refrigerated: 7 days
Frozen: 3 months
Methodology
Quantitative Nephelometry
Reference Range
Cystatin C: 0.5 - 1.2 mg/L
eGFR Calculated: >90 mL/min/1.73 m2
According to the National Kidney Foundation, the
following interpretation of results is suggested:
• Normal Range: ≥90 mL/min/1.73 m2
• May mean early-stage kidney disease:
60-89 mL/min/1.73 m2
• May mean kidney disease: 15-59 mL/min/1.73 m2
• May mean kidney failure: <15 mL/min/1.73 m2
eGFR Calculated: >90 mL/min/1.73 m2
According to the National Kidney Foundation, the
following interpretation of results is suggested:
• Normal Range: ≥90 mL/min/1.73 m2
• May mean early-stage kidney disease:
60-89 mL/min/1.73 m2
• May mean kidney disease: 15-59 mL/min/1.73 m2
• May mean kidney failure: <15 mL/min/1.73 m2
Performing Laboratory
Warde Medical Laboratory
New York DOH Approval Status
Yes
Interface Map for CYST
| Test Name | Ordering Code | Result Code | Component Name | LOINC Code | AOE Prompt | Units |
|---|---|---|---|---|---|---|
| Cystatin C with eGFR | 3000979 | |||||
| 3688340 | Cystatin C, Serum | 33863-2 | No | |||
| 3000981 | eGFR Calculated | 50210-4 | No |