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Haemoglobinometry in general practice.

S M Lewis1, A Osei-Bimpong

  • 1Department of Haematology and WHO Collaborating Centre for Haematological Technology, Imperial College, Hammersmith Hospital, London, UK. smlenl@intonet.co.uk

Clinical and Laboratory Haematology
|December 4, 2003
PubMed
Summary
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Haemoglobinometry is a reliable point-of-care screening test in general practice. Further full blood counts are only needed for anaemia or specific clinical indications, ensuring efficient patient care.

Area of Science:

  • Clinical Pathology
  • Haematology
  • Point-of-Care Testing

Background:

  • Haemoglobinometry is a standard point-of-care test.
  • Its adequacy as a sole haematological screening tool in general practice requires evaluation.

Purpose of the Study:

  • To assess the effectiveness of haemoglobinometry as a standalone screening procedure in general practice.
  • To determine the necessity of full blood counts (FBCs) based on haemoglobin levels and clinical context.

Main Methods:

  • Analysis of 500 sequential blood counts from general practice.
  • Evaluation of haemoglobin levels and other FBC parameters against normal reference values (2SD and 3SD).
  • Calculation of diagnostic utility metrics: positive predictive value (PPV), negative predictive value (NPV), likelihood ratio (LR), and diagnostic reliability.

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Main Results:

  • 81% of samples had normal haemoglobin levels.
  • 15% of samples showed abnormalities in other FBC parameters when using 2SD limits; this reduced to 7.6% at 3SD limits.
  • High diagnostic utility: PPV 0.83, NPV 0.85, LR 14.3, overall reliability 84%.

Conclusions:

  • Haemoglobinometry alone is a valuable primary screening test in general practice.
  • FBC is recommended only for confirmed anaemia or when indicated by clinical signs/history.
  • This approach minimizes unnecessary FBCs but may miss pre-anaemic iron deficiency.