Employee Login  |   Subscribe  |   Careers  |   Appointments
List All Test Names Beginning With:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Vitamin A

Source Blood
Mnemonic VITA

 
Specimen Requirements

1 x 3.5 mL gold top SST tube

0.5 mL serum

Minimum Blood Volumes for Microcollections

Minimum 10 hour fast. No alcohol or nutritional supplements within 24 hours.

Protect from light by wrapping tubes in foil immediately after collection.  Specimens not protected from light will be rejected.

 

Specimen Handling

PSC & RRL:
Centrifuge and pour off serum.  Protect from light by using amber aliquot tube and lid, or wrap tubes in foil. Transport serum on ice to DSC. 

Extra-regional:
Centrifuge and pour off serum. Protect from light by using amber aliquot tube and lid, or wrap tubes in foil. Freeze serum before transporting to DSC.

DSC:
Freeze specimens upon receipt in lab; ensure frozen specimens do not thaw.

 

Additional Information This assay does not measure other vitamin A metabolites such as retinaldehyde and retinoic acid.
Some foods containing vitamin A include liver, whole milk, colourful fruits and vegetables (i.e. dried apricots, sun-dried tomatoes in oil, kale, spinach).

 
Testing Location Analytical Toxicology
Testing Frequency Weekly

 
Alternate Name(s) Retinol

 
Reference Interval < 1 year:           0.5 to 1.8 umol/L
1 - 6 years:       0.7 to 1.5 umol/L
7 - 12 years:     0.9 to 1.7 umol/L
13 - 18 years:   0.9 to 2.5 umol/L
≥ 18 years:       1.5 - 3.5 umol/L