PT - JOURNAL ARTICLE AU - J. Van Der Veen AU - Ph. Verbrugge AU - F. J. Van De Vaart AU - F. A. Boom TI - Particulate Matter Determination in LVPs Produced in Dutch Hospital Pharmacies, Part 1: Particle-Counting Accuracy DP - 1997 Mar 01 TA - PDA Journal of Pharmaceutical Science and Technology PG - 81--88 VI - 51 IP - 2 4099 - http://journal.pda.org/content/51/2/81.short 4100 - http://journal.pda.org/content/51/2/81.full SO - PDA J Pharm Sci Technol1997 Mar 01; 51 AB - Reproducible particle counting using the light-obscuration technique is often troublesome because no absolute standard is available. Therefore, at the Laboratory of Dutch Pharmacists the “calibration-in-time” method was developed. This method enables checking of the amount of particles counted from a diluted latex suspension as a function of time. A particularity of the method is the one-step dilution procedure. The calibration-in-time method is compared with the particle-counting accuracy test according to the USP <788>. Advantages and disadvantages of both methods are discussed.