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Jan 01, 2019

Version 2

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# Test-mate (Model 400) erythrocyte acetylcholinesterase (AChE) test V.2

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PLOS One

DOI

https://dx.doi.org/10.17504/protocols.io.wpyfdpw

H.K. Jeevan Dhanarisi¹, Indika B. Gawarammana², Fahim Mohamed³, Michael Eddleston⁴

¹South Asian Clinical Toxicology Research Collaboration, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka;

²Department of Medicine, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka;

³Faculty of Allied Health Sciences, University of Peradeniya, Peradeniya, Sri Lanka;

⁴Pharmacology, Toxicology, & Therapeutics, University/BHF Centre for Cardiovascular Science, University of Edinburgh, UK

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Jeevan Dhanarisi

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DOI: https://dx.doi.org/10.17504/protocols.io.wpyfdpw

External link: https://doi.org/10.1371/journal.pone.0200133
**Protocol Citation:** H.K. Jeevan Dhanarisi, Indika B. Gawarammana, Fahim Mohamed, Michael Eddleston 2019. Test-mate (Model 400) erythrocyte acetylcholinesterase (AChE) test. protocols.io https://dx.doi.org/10.17504/protocols.io.wpyfdpw

**Manuscript citation:**

Dhanarisi HKJ, Gawarammana IB, Mohamed F, Eddleston M (2018) Relationship between alcohol co-ingestion and outcome in profenofos self-poisoning – A prospective case series. PLoS ONE 13(7): e0200133. doi: 10.1371/journal.pone.0200133

**License:** This is an open access protocol distributed under the terms of the **Creative Commons Attribution License**, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited

**Protocol status:** Working

We use this protocol and it's working

**Created:** January 01, 2019

**Last Modified:** January 01, 2019

**Protocol Integer ID:** 18904

**Keywords:** erythrocyte acetylcholinesterase, test

**Guidelines**

* For the quantitative determination of erythrocyte acetylcholinesterase (AChE) in blood to monitor pesticide exposure.

* For in vitro diagnostic use.

* For laboratory use by trained laboratory technicians only.
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# Materials

## MATERIALS

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Buffer: 2mL per assay tube. Contains phosphate, surfactant, dye and EDTA preservative.

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AChE Erythrocyte Cholinesterase Reagent: Lyophilized, 96 tests per plate. Store lyophilized reagent at 15 - 30°C, protected from light. Reconstitute with 3 drops of distilled water. Stable 72 hours at 15 - 35°C after reconstitution. Final assay includes: 1mM AcTC, 0.3mM DTNB, 20µM As1397, 50mM potassium phosphate and 0.03% Triton X-100 (white cap), pH 7.6.

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Distilled water: 15mL in plastic dropper bottle.

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Powder free gloves (2 gloves per patient)

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Finger stick lancets (1 lancet per patient)

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Alcohol wipes (1 wipe per patient)

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Sterile gauze pads (1 pad per patient)

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Small round bandages (1 bandage per patient)

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Biohazard disposal container

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Filter papers (capillary wipes)

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Transfer pipettes.

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Test-mate ChE Photometric Analyzer

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Capillary tubes (10µL)

# Troubleshooting

## Safety warnings

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Precautions must be taken to eliminate hazards either to the operator or the person being tested. The following rules must be followed during the testing procedure.

1. Do not reuse blood lancets or capillaries.

2. Put used lancets and capillaries in a hazard bag.

3. The operator must wear gloves and safety glasses.
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Erythrocyte AChE activity analysis

1. Remove Test-MateTM components from the carrying case and lay them out, within easy reach, in front of you on a flat surface.

2. Press the "Power" key. The display screen indicates a 15 seconds warm up count down. Write up the temperature on your sheet.

3. Press the "Mode" key until "AChE mode" is displayed.

4. Remove the plastic covering of one of the reagent wells of the microplate with the biopsy punch. Add three drops of reagent to the well and dissolve the reagent by aspirating it using the transfer pipette. Fill the transfer pipette with the dissolved reagent.

5. Press the "Test" key. The display reads "Add blood" followed by "Insert tube" and "Press Test". Add three drops of buffer to the tube, mix with the stirring paddle.

6. Insert the tube into the colorimeter. Press the "Test" key. A 10 second "Blanking" is displayed ending in a "beep". "Remove tube" followed by "Press Test" is displayed.

7. Fill the capillary tube with blood (by sticking the end of the cleaned finger with the lancet) and dispense into the buffer filled tube after removing any excess blood from the outside of the capillary by rolling the end of the capillary over a filter paper. Shake the assay tube vigorously for 15 seconds and insert the tube into the sample analyzer.

8. Press the "Test" key. The display reads "Add blood" followed by "Insert tube" and "Press Test".

9. Press the "Test" key. A 30 second "Reading" is displayed followed by a "beep". During this time Hgb has been determined. The display reads "Remove tube" followed by "Press Test".

10. Press the "Test" key. The display reads "AT BEEP" followed by "Add reagent". At the "beef" add the reagent in the transfer pipette to the diluted blood-filled tube. Insert tube followed by "Press test". The display reads "Shake". Shake the tubes by inverting five times.
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11. Press the "Test" key. The display shows pre-incubation countdown followed by a 50 seconds reading phase ending in a "beep". The analysis of erythrocyte AChE is concluded.

The display reads "Remove tube" followed by "Press test". Remove the tube and pour the solution into the waste bottle.

12. Press the "Test" key to initiate results recovery. After the first result is displayed, keep pressing the "Disp." key to recover the rest of the data.