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Vitamin A

Alternate test name


Lab area
Clinical Biochemistry - Special
Method and equipment
Expected turn-around time
14 days
Specimen type

300 uL Serum or Plasma

Specimen requirements
  • Collect 1mL whole blood, spin, separate and freeze (-20oC)
  • Separated within 2 hrs of collection.
  • Stored protected from light
  • Unacceptable Specimens:    Oxalate, citrate and EDTA cause significant losses of vitamin A and E
Storage and transportation

Stability: 1 month @ -20oC

Ship Frozen

Special requirements

Patient should be fasted for 12-14 h prior to sample collection.
No vitamin supplement within the previous 24 h.
No alcohol intake within the previous 24 h.

Indicate whether sample is from fasting patient or not

Shipping information
The Hospital for Sick Children
Rapid Response Laboratory
555 University Avenue, Room 3642
Toronto, ON
M5G 1X8
Phone: 416-813-7200
Toll Free: 1-855-381-3212
Hours: 7 days/week, 24 hours/day
Background and clinical significance

Vitamin A is critical for vision, growth, and many cell functions. High concentrations of vitamin A are seen with renal failure, but this is not associated with toxicity, and excessive ingestion. High concentrations are associated with bone fractures. Low concentrations of vitamin A are consistent with fat malabsorption and rarely due to inadequate diet. Vitamin A, vitamin E, and carotene are always extracted and detected simultaneously. This is a free vitamin A (retinol).

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