Malaria Microscopy QA: Validation Schemes and Frequency by JeffreyVdeGuzman

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									              Table 6.1 Validation Schemes and Frequency
 Series of          Scheme 1           Scheme 2                                     Scheme 3
 Validation     > 240 total blood    200-240 total                            < 200 total blood films
                films in previous    blood films in                              in previous year
                       year          previous year
                Every 3 months       Every 3 months                                 Every year
 st
1              Get the first 30  Get all blood
validation     blood films       films examined in 1. Collect all blood films examined in the previous 6 months prior to
               examined in the   the previous 3        the validation schedule and send to validator.
               previous 3 months months prior to   1.1 If results of validation based on sent blood films by the
                                 the validation
               prior to validation                       microscopist show more than 20% error, validator needs to visit
               schedule          schedule                the microscopist at once. There is no need for the validator to
                                                         send a panel of 20 slides.
2nd            Get the last 30   Get all blood     1.2 If results of validation based on sent blood films by the
validation     blood films       films examined in       microscopist show less than 20% error, validator has to send a
               examined in the   the previous 3          panel of 20 slides composed of the following to further ensure
               previous 3 months months prior to         and sustain the proficiency of the microscopist.
               prior to the      the validation          (i) 9 blood films of P. falciparum
               validation        schedule                    - 1 blood films of 50-100 parasite/µL
               schedule                                      - 4 blood films of 300-800 parasite/µL
3rd            Get the first 30  Get all blood                - 4 blood films of 1000-2000 parasite/µL
validation     blood films       films examined in        (ii) 4 blood films of P. vivax
               examined in the   the previous 3                 - 2 blood films of 100-500 parasite/µL
               previous 3 months months prior to                - 2 blood films of > 500
               prior to the      the validation          (iii) 1 blood film of P. malariae
               validation        schedule                (iv) 1 blood film of mixed infection
               schedule                                  (v) 5 blood films of no-malaria parasite seen (NMPS)
                                                    2. If no blood films were examined by the microscopist in the
4th            Get the last 30   Get all blood         previous 6 months, the validator has to send the panel of 20
validation     blood films       films examined in     slides for reading to sustain proficiency.
               examined in the   the previous 3
               previous 3 months months prior to    Note: The above composition of blood films may be modified
               prior to the      the validation              depending on the dominance of parasite in the area.
               validation        schedule
               schedule

Steps      in a. Microscopists transfer the results (1) For all blood films examined in the past 6 months prior to
Recording         of microscopy on Form 1. Malarial        validation schedule:
the results       Blood     Films    for    Validation     a. Microscopists transfer the results of microscopy on Form 1.
of      each      following the instructions provided         Malarial Blood Films for Validation following the instructions
series     of     in Annex 6.1.                               provided in Annex 6.1.
validation                                                 b. Microscopists ensure that the slide ID No. written on Form I
              b. Microscopists ensure that the slide          is consistent with the slide ID No. written on the slides.
                  ID No. written on Form I is              c. Microscopists submit the accomplished Form 1 in a sealed
                  consistent with the slide ID No.            envelope together with the blood films in the slide box within
                  written on the blood film.                  2 weeks upon receipt of validation notice.
                                                       (2) Panel of blood films:
              c.     Microscopists     submit      the     a. Validators send a panel of blood films for reading and a
                  accomplished Form 1 in a sealed               blank Form 1 on which the microscopists will record the
                  envelope together with the blood              results of his/her reading.
                  films in the slide box within 2          b. Advise microscopists not to fill up the following sections of
                  weeks upon receipt of validation              Form 1 as these are not applicable when validation is done
                  notice.                                       through assessment of panel of blood films:
                                                                Item No. 8: No. of blood films submitted
                                                                Item No. 9: Total Number of Blood Films Per Quarter
                                                                Item No. 10: Total Number of Positive Blood Films for the
                                                                                Quarter
                                                                Item No. 12: Date Examined
                                                                Item No. 16: Remarks
                                                          c. Upon receipt of panel of blood films, microscopist examines
                                                              the panel of blood films and submits accomplished Form 1
                                                              within 2 weeks.

								
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