Cystatin C
CPT4 code
Name of the Procedure:
Cystatin C Test, Serum Cystatin C, CysC
Summary
The Cystatin C test is a blood test used to measure the level of cystatin C, a protein produced by cells in the body. This test helps assess kidney function and is often used as an alternative or complement to creatinine-based tests.
Purpose
The test primarily addresses the diagnosis and monitoring of kidney function and early detection of kidney disease. It aims to provide a more accurate assessment of kidney health, particularly in cases where creatinine-based tests may be less reliable.
Indications
- Symptoms of kidney dysfunction: edema, fatigue, high blood pressure
- Patients with a family history of kidney disease
- Conditions known to affect kidney function: diabetes, hypertension, cardiovascular disease
- Monitoring kidney function in patients on nephrotoxic medications
Preparation
- Generally, no fasting is required.
- Inform the healthcare provider of all medications and supplements being taken.
- No specific pre-test diagnostics are typically needed.
Procedure Description
- Blood Sample Collection: A healthcare professional will draw a blood sample, typically from a vein in your arm.
- Laboratory Analysis: The blood sample is sent to a lab where the level of cystatin C is measured using specialized techniques.
No anesthesia or sedation is needed for this simple blood draw.
Duration
The blood draw takes only a few minutes. Results are generally available within a few days.
Setting
The test is typically performed in a hospital, outpatient clinic, or laboratory.
Personnel
- Phlebotomist or nurse to draw the blood sample
- Laboratory technician or medical technologist to analyze the sample
- Physician to interpret the results
Risks and Complications
- Minor risks include bruising or infection at the puncture site.
- Rarely, patients may feel lightheaded or faint.
Benefits
- Provides a more accurate assessment of kidney function than some other tests.
- Early detection of kidney disease can lead to timely intervention and management.
- Particularly useful for patients where creatinine levels may be influenced by other factors (e.g., muscle mass, diet).
Recovery
- No recovery time is needed.
- Patients can resume normal activities immediately after the blood draw.
Alternatives
- Creatinine blood test: Less expensive but less accurate in certain populations.
- Glomerular Filtration Rate (GFR) test: Often used in conjunction with creatinine measurement.
- Urine albumin test: Used to detect protein in the urine as an indicator of kidney damage.
Patient Experience
- Mild discomfort or pain from the needle stick.
- Brief bruising or soreness at the puncture site, managed with a cold pack and over-the-counter pain relief if necessary.
- Generally, minimal disruption to daily life.