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[Experience with the impression cytology test for detecting vitamin A deficiency in children]
A Cañete Díaz1, R Codoceo Alquinta, L C Carvalho Galvao
1Servicio de Bioquímica, Hospital Infantil La Paz, Madrid.
Insights
Conjunctival impression cytology is a simple, non-invasive method to detect vitamin A deficiency. This technique shows promise as a screening tool for preclinical vitamin A deficiency in populations.
Area of Science:
- Ophthalmology
- Nutritional Science
- Diagnostic Cytology
Background:
- Vitamin A deficiency is a significant global health concern, particularly in vulnerable populations.
- Early detection of vitamin A deficiency is crucial for preventing irreversible health consequences.
- Conjunctival impression cytology (CIC) is a minimally invasive technique proposed for assessing vitamin A status.
Observation:
- The study evaluated vitamin A status in 41 patients using serum retinol concentration (via HPLC) and CIC.
- All patients with normal vitamin A levels exhibited normal CIC results.
- CIC demonstrated 100% sensitivity in identifying normal vitamin A status.
Findings:
- CIC identified 8 patients with vitamin A deficiency.
- However, only 6 of these 8 patients had concurrently low serum retinol levels.
- This suggests CIC may detect preclinical vitamin A deficiency not yet evident in serum retinol.
Implications:
- Conjunctival impression cytology shows potential as a valuable screening tool for preclinical vitamin A deficiency.
- Its simplicity, low cost, and non-invasive nature make it suitable for large-scale population screening.
- Further research can validate CIC's role in public health initiatives for vitamin A deficiency prevention.
Abstract:
Impression cytology has been suggested as a relatively simple, cheap, practical and non invasive technique for documenting physiologically significant vitamin A deficiency. The vitamin A status of 41 patients was evaluated by serum retinol concentration by high power liquid chromatography (HPLC) and conjunctival impression cytology was performed on each child. All children with normal vitamin A status had normal conjunctival impression cytology. The sensibility of this method was 100%. However, in the 8 vitamin A deficient patients by impression cytology, only 6 of them showed low serum vitamin A levels. Impression cytology appears to detect preclinical vitamin A deficiency that this technique may by of potential usefulness as a screening tool for preclinical vitamin A deficiency populations.