Vitamin A (Retinol) is a fat soluble vitamin and is measured in
the diagnosis of vitamin A toxicity and in patients with cystic
fibrosis to look for fat-soluble vitamin deficiency.
Deficiency of Vitamin A causes dry skin, night blindness, low
resistance to infection and problems with bone growth and tooth
Very high levels of Vitamin A cause headache, vomiting, blurred
vision and liver damage.
Request on ICE
If specific criteria for analysis met
Requests by paediatricians, on patients with cystic fibrosis or
in patients with suspected toxicity
Approximately 1 weeks
Serum in yellow (SST) tube
Lithium heparin samples may be used for children
Minimum volume 1 mL
Samples should be transported to laboratory immediately and kept
in the dark (in a thick brown envelope).
Causes for Rejection
Not meeting specific criteria for analysis.
Male: 0.92 - 2.76 µmol/L
Female: 0.88 - 2.64 µmol/L