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An inexpensive and reliable new haemoglobin colour scale for assessing anaemia.
J Clin Pathol. 1998 Jan; 51(1):21-4.JC

Abstract

AIM

To describe a new inexpensive method (the WHO Colour Scale) for estimating haemoglobin concentration from a drop of blood by means of a colour scale, and to compare its reliability with a standard laboratory method of measuring haemoglobin, and its clinical usefulness in field trials.

METHODS

The new colour scale method was used to measure haemoglobin concentration in 1213 random venous blood samples from routine work in four laboratories (one each in the UK, South Africa, Thailand, and Switzerland). Limited field trials of the method for assessing clinical usefulness were done in a rural hospital (in South Africa) staffed by nurses, at two blood donor sessions (one each in South Africa and Thailand), and by nonlaboratory personnel in malaria clinics (in Thailand), following training and a short practice session.

RESULTS

In the laboratory based comparability study the presence of anaemia was reliably detected using the new method with 91% sensitivity and 86% specificity. Clinically relevant levels of anaemia (mild to moderate, pronounced, and severe) were graded and serious anaemia (< 8 g/dl) was identified with an efficiency of 89%. The clinical trials showed the ease and reliability with which the colour scale could be used by non-laboratory persons after brief training. The blood donor trials showed it to be at least as reliable as the copper sulphate method with the advantage of being more convenient.

CONCLUSIONS

The preliminary studies have shown that the WHO Colour Scale is a reliable screening method for detecting anaemia, especially for diagnosing serious anaemia. Following a brief training session health workers found it simple to use and, at a cost of about 1/10th that for traditional photometric analysis, it should be of value in "countries in need" for primary health centres, obstetrical management, paediatric clinics, tropical disease control programmes, blood transfusion donor selection, as well as for industrial health checks and epidemiological studies.

Authors+Show Affiliations

Department of Haematology, Imperial College School of Medicine, Hammersmith Hospital, London, UK.No affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Journal Article
Multicenter Study
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

9577366

Citation

Lewis, S M., et al. "An Inexpensive and Reliable New Haemoglobin Colour Scale for Assessing Anaemia." Journal of Clinical Pathology, vol. 51, no. 1, 1998, pp. 21-4.
Lewis SM, Stott GJ, Wynn KJ. An inexpensive and reliable new haemoglobin colour scale for assessing anaemia. J Clin Pathol. 1998;51(1):21-4.
Lewis, S. M., Stott, G. J., & Wynn, K. J. (1998). An inexpensive and reliable new haemoglobin colour scale for assessing anaemia. Journal of Clinical Pathology, 51(1), 21-4.
Lewis SM, Stott GJ, Wynn KJ. An Inexpensive and Reliable New Haemoglobin Colour Scale for Assessing Anaemia. J Clin Pathol. 1998;51(1):21-4. PubMed PMID: 9577366.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - An inexpensive and reliable new haemoglobin colour scale for assessing anaemia. AU - Lewis,S M, AU - Stott,G J, AU - Wynn,K J, PY - 1998/5/13/pubmed PY - 1998/5/13/medline PY - 1998/5/13/entrez SP - 21 EP - 4 JF - Journal of clinical pathology JO - J. Clin. Pathol. VL - 51 IS - 1 N2 - AIM: To describe a new inexpensive method (the WHO Colour Scale) for estimating haemoglobin concentration from a drop of blood by means of a colour scale, and to compare its reliability with a standard laboratory method of measuring haemoglobin, and its clinical usefulness in field trials. METHODS: The new colour scale method was used to measure haemoglobin concentration in 1213 random venous blood samples from routine work in four laboratories (one each in the UK, South Africa, Thailand, and Switzerland). Limited field trials of the method for assessing clinical usefulness were done in a rural hospital (in South Africa) staffed by nurses, at two blood donor sessions (one each in South Africa and Thailand), and by nonlaboratory personnel in malaria clinics (in Thailand), following training and a short practice session. RESULTS: In the laboratory based comparability study the presence of anaemia was reliably detected using the new method with 91% sensitivity and 86% specificity. Clinically relevant levels of anaemia (mild to moderate, pronounced, and severe) were graded and serious anaemia (< 8 g/dl) was identified with an efficiency of 89%. The clinical trials showed the ease and reliability with which the colour scale could be used by non-laboratory persons after brief training. The blood donor trials showed it to be at least as reliable as the copper sulphate method with the advantage of being more convenient. CONCLUSIONS: The preliminary studies have shown that the WHO Colour Scale is a reliable screening method for detecting anaemia, especially for diagnosing serious anaemia. Following a brief training session health workers found it simple to use and, at a cost of about 1/10th that for traditional photometric analysis, it should be of value in "countries in need" for primary health centres, obstetrical management, paediatric clinics, tropical disease control programmes, blood transfusion donor selection, as well as for industrial health checks and epidemiological studies. SN - 0021-9746 UR - https://www.unboundmedicine.com/medline/citation/9577366/An_inexpensive_and_reliable_new_haemoglobin_colour_scale_for_assessing_anaemia_ L2 - http://jcp.bmj.com/cgi/pmidlookup?view=long&amp;pmid=9577366 DB - PRIME DP - Unbound Medicine ER -