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Utility of the DiaSpect Hemoglobinometry System as a Point-of-Care Analyzer

Robertson, Lynn MSc, FIBMS; Lewis, David MSc, CSci, FIBMS, MIHM; Osei-Bimpong, Andrew MSc, CSci, FIBMS, MIHM

Point of Care: The Journal of Near-Patient Testing & Technology: March 2011 - Volume 10 - Issue 1 - p 17-21
doi: 10.1097/POC.0b013e318207821a
Review Article

Objective: Accurate measurement of hemoglobin is essential for the diagnosis of anemia, and point-of-care procedures are used where laboratory facilities are not available. The DiaSpect hemoglobinometer has a new technology for hemoglobin measurement, and this study evaluates its utility.

Methods: Hemoglobin values from the DiaSpect hemoglobinometry system were compared with a standardized laboratory-based reference analyzer (Sysmex XE-2100). Hemoglobin values were measured on 406 hospital-based patients (200 males and 206 females; age range, 17-60 years) and assessed for precision, linearity, comparability, and accuracy. Stability at 4 and 37°C and the effect of interference from analytes were also evaluated. The DiaSpect device was also accessed for potential use in a blood donor setting.

Results: Precision studies showed acceptable replicate hemoglobin levels tested (coefficient of variation, <5). Serial dilutions of hemoglobin (18 g/dL down to 4 g/dL) showed excellent linearity (r 2 = 0.998). Hemoglobin values compared well with the reference analyzer within the range 5.5 to 19.3 g/dL (P > 0.5). At both temperatures tested, DiaSpect hemoglobin values were as stable as the reference analyzer values (P = 0.609). However, extreme leukocytosis (>28.0 g/dL) and marked hemoglobinopathy affected measurements (P < 0.001). Bilirubinemia did not cause any significant interference (P = 0.264).

The DiaSpect system compared well with established methods of blood donor screening, producing similar readings as the reference analyzer (P > 0.05).

Conclusions: This evaluation has shown this hemoglobinometer to be simple, reliable, extremely rapid and accurate, and comparable to the standardized reference analyzer. Overall, it is suitable for point-of-care where there are limited laboratory facilities or as a potential analyzer used in blood donor screening.

From the Imperial College Healthcare NHS Trust, UK.

Reprints: Andrew Osei-Bimpong, MSc, CSci, FIBMS, MIHM, Pathology Centre, G Block, 150 Du Cane Rd, East Acton, W12 0HS, UK. E-mail:

© 2011 Lippincott Williams & Wilkins, Inc.