Purpose
Forensic Analysis
Method(s)
Chemistry Analyzer
Colorimetry (C)
Suggested CPT Code(s)
82438
82570
82945
83520
84302
84520
New York State Approval Status

Approved

Turnaround Time

4 days

Test Includes
1 Creatinine (Vitreous Fluid) Colorimetry (C) mg/dL 0.5
2 Sodium (Vitreous Fluid) Chemistry Analyzer mmol/L 80 Metal/Element
3 Potassium (Vitreous Fluid) Chemistry Analyzer mmol/L 1 Metal/Element
4 Chloride (Vitreous Fluid) Chemistry Analyzer mmol/L 70 Electrolyte
5 Glucose (Vitreous Fluid) Chemistry Analyzer mg/dL 35 Sugar
6 Urea Nitrogen (Vitreous Fluid) Chemistry Analyzer mg/dL 3 Electrolyte

Specimen Type
Fluid
Requested Volume
2 mL
Minimum Volume
1.0 mL
Special Handling
Quantitative results for sodium and for potassium in vitreous specimens will be affected if performed on Gray Top Tubes since these collection tubes contain sodium fluoride and potassium oxalate.
Specimen Container
Red top tube (no additive) OR Plastic container (preservative-free)

Additional Collection Instructions

Transport Temperature
Refrigerated
Light Protection
Not Required
Rejection Criteria
None

Rejection criteria pertain to clinical specimen submissions only.

Stability
Room Temperature: Undetermined
Refrigerated: Undetermined
Frozen (-20 °C): Undetermined

Vitreous glucose levels decrease rapidly after death in vivo. This decrease is time and temperature-dependent, with a delay in loss facilitated by cold temperatures. The in vivo loss of glucose is reported to stop at approximately 18 hours post-death. Additionally, NMS studies have demonstrated a continued in vitro loss of glucose in vitreous when specimens are maintained at room temperature or refrigerated. No in vitro loss occurs when specimens are maintained frozen (-20°C) for up to 30 days.
1 Creatinine (Vitreous Fluid) Colorimetry (C) mg/dL 0.5
2 Sodium (Vitreous Fluid) Chemistry Analyzer mmol/L 80 Metal/Element
3 Potassium (Vitreous Fluid) Chemistry Analyzer mmol/L 1 Metal/Element
4 Chloride (Vitreous Fluid) Chemistry Analyzer mmol/L 70 Electrolyte
5 Glucose (Vitreous Fluid) Chemistry Analyzer mg/dL 35 Sugar
6 Urea Nitrogen (Vitreous Fluid) Chemistry Analyzer mg/dL 3 Electrolyte

Interface Map

LOINC® Information