Cystatin C with Estimated Glomerular Filtration Rate (eGFR), Serum/Plasma

Test Overview

Method

Immunoturbidimetry

Analytical Platform

Roche Cobas c501

Result Included

Cystatin C; Cystatin C eGFR

Specimen

Specimen Type

Serum
Plasma (Li heparin)

Volume

Sample Volume

1 mL

Collection & Handling

Handling Information

Separate and freeze immediately. Store and send frozen.

Stability

Refrigerated	Frozen
7 days	See below

Stability at -20°C or lower: Plasma 6 months or serum 24 months.<br>If the specimen thaws, it is unsuitable for analysis.

Rejection Criteria

Criteria	Specification
Specimen	Not frozen

Performance & Interpretation

Turnaround Time

5 days

Results

Cystatin C

mg/L

≤ 1.20

mg/dL x 10
CYSCeGFR

mL/min/1.73m2

≥ 90
CYSCeGFR = GlomerularFiltration Rate estimatedfrom measured Cystatin C)
NOTE: Accuracy of eGFR formula has not been validated for eGFR ≥90 mL/min/1.73m²

Comment

For anyone <18 years of age, eGFR will be calculated using the Schwartz Cystatin C Equation (Kidney Int. 2012 Aug;82(4):445-53).
For anyone ≥18 years of age, eGFR will be calculated using the CKD-EPI Cystatin C Equation (NEJM. 2012 Jul5;367(1):20-9).

Referral Location

Canada

Interface & Setup

HL7 Interface Codes

Order Code	Result Name	Result Codes	Units
CYSTC	Cystatin C	28596	mg/mL
	CYSTCeGFR	28597	mL/min/1.73m2

Test Version

Last Updated

2023-05-26