An evaluation of the Sequoia-Turner Cell Dyn 900

A formal evaluation of the Sequoia-Turner Cell Dyn 900, a compact eight-parameter semi-automated blood cell counter, was carried out in a small paediatric haematology laboratory. The instrument's precision, linearity and carry-over were adequate. Comparison with a Coulter ZF6 system plus visual platelet count showed good agreement, and results in the UK National External Quality Assessment Scheme also compared well with 'all methods' values. Throughput was assessed at 54 eight-parameter counts per hour. The machine proved to be reasonably economical, highly reliable and easy to operate. It was popular with staff and can be recommended, particularly for the smaller laboratory.