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”

Effective Date 06/30/2026
Update Type Inactivated/Replace Test
Test Update View Test Update ›

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

Minimum Volume

0.5 mL

Transport Temperature

Refrigerated

Rejection Criteria

Grossly lipemic samples.

Stability

Room temperature: Undetermined
Refrigerated: 7 days
Frozen: 3 months

Methodology

Quantitative Nephelometry
more

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
more

Performing Laboratory

Warde Medical Laboratory
more

New York DOH Approval Status

Yes
more

Interface Map for CYST

Test Name Ordering Code Result Code Component Name LOINC Code AOE Prompt Units
Cystatin C with eGFR3000979
3688340Cystatin C, Serum33863-2No
3000981eGFR Calculated50210-4No
WML Test Directory Update | June 2026 | Warde Medical Laboratory Page