Pathology Handbook

Vitamin A



Clinical Indications

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 enamel.

Very high levels of Vitamin A cause headache, vomiting, blurred vision and liver damage.

Request Form 

Request on ICE


If specific criteria for analysis met 

Specific Criteria

Requests by paediatricians, on patients with cystic fibrosis or in patients with suspected toxicity

Patient Preparation


Turnaround Time

Approximately 1 weeks


Serum in yellow (SST) tube

Lithium heparin samples may be used for children


Minimum volume 1 mL


Vacutainer gold top


Samples should be transported to laboratory immediately and kept in the dark (in a thick brown envelope).

Causes for Rejection

Unlabelled sample
Not meeting specific criteria for analysis. 

Reference Range

Male:     0.92 - 2.76 ┬Ámol/L

Female: 0.88 - 2.64 ┬Ámol/L